Beringeria - Würzburger Geowissenschaftliche Mitteilungen Verein der Freunde der Würzburger Geowissenschaften e.V.

Für die Zusammenfassungen klicken Sie bitte auf die Autoren The abstracts are linked to the authors' names

 

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Beringeria 1 (1989) - 35 (2005)

Beringeria 1 (1989), 143 S., 17,--EUR STEPHANEK, J. & GEYER, G. Spurenfossilien aus dem Kulm (Unterkarbon) des Frankenwaldes . HAMMANN, W., HEUNISCH, C. & SCHÜSSLER, U. Organische Mikrofossilien aus dem Unterdevon des Frankenwaldes . GEYER, G. Late Precambrian to early Middle Cambrian Lithostratigraphy of southern Morocco Beringeria Sonderheft/Special Issue 1 (1990), 67 S., vergriffen - out of print KELBER, K.-P. Die versunkene Pflanzenwelt aus den Deltasümpfen Mainfrankens vor 230 Millionen Jahren Beringeria 2 (1990), 172 S., 20,--EUR PENG, S. Tremadoc stratigraphy and Trilobite faunas of northwestern Hunan (China) Beringeria 3 (1990), 363 S., 30,--EUR GEYER, G. Die marokkanischen Ellipsocephalidae (Trilobita: Redlichiida) Beringeria 4 (1991), 235 S., 25,--EUR HEINZE, M. Evolution benthonischer Faunengemeinschaften im Jura des Pariser Beckens und in der äthiopischen Faunenprovinz des Beckens von Kachchh (Indien) - ein Vergleich . JIARUN, Y. & FÜRSICH, F. T. Middle and Upper Jurassic bivalves from the Tanggula Mountains, W-China . SHERGOLD, J. H., SDZUY, K. Late Cambrian trilobites from the Iberian Mountains, Zaragoza Province, Spain Beringeria 5 (1992), 174 S., 22,--EUR ABERHAN, M. Palökologie und zeitliche Verbreitung benthischer Faunengemeinschaften im Unterjura von Chile. Beringeria 6 (1992), 219 S., 27,--EUR HAMMANN, W. The Ordovician trilobites from the Iberian Chains in the province of Aragón, NE-Spain. I. The trilobites of the Cystoid Limestone (Ashgill Series). Beringeria 7 (1993), 190 S., 27,--EUR FRIEDRICH, W.-P. Systematik und Funktionsmorphologie mittelkambrischer Cincta (Carpoidea, Echinodermata). Beringeria 8 (1993), 207 S., 30,--EUR PANDEY, D. K. & FÜRSICH, F. T. Contributions to the Jurassic of Kachchh, Western India. I. The coral fauna. . D'ALESSANDRO, A. & DE MARCO, A. Bionomic analysis of two Upper Pliocene communities from southern Italy. . JINGENG, S. & FÜRSICH, F. T. Bivalve faunas of eastern Heilongjiang, northeastern China. I. Non-marine Bivalvia of the Xiachengzi Formation (Lower Cretaceous). . SDZUY, K. Early Cincta (Carpoidea) from the Middle Cambrian of Spain. Beringeria 9 (1994), 153 S., 29,--EUR OSCHMANN, W. Der Kimmeridge Clay von Yorkshire als Beispiel eines fossilen Sauerstoff-kontrollierten Milieus Beringeria 10 (1994), 169 S., 35,--EUR VAšÍCEK, Z., MICHALÍK, J. & REHÁKOVÁ, D. Early Cretaceous stratigraphy, palaeogeography and life in Western Carpathians. Beringeria 11 (1994), 99 S., 30,--EUR HÜSSNER, H. Reefs, an Elemantary Principle with many Complex Realizations. Beringeria 12 (1994), 125 S., 27,--EUR SHA, J. & FÜRSICH, F. T. The Late Jurassic and Early Cretaceous buchiid fauna of eastern Heilongjiang (Northeastern China). . FÜRSICH, F. T., PANDEY, D. K., CALLOMON, J. H., OSCHMANN, W. & JAITLY, A. K. Contributions to the Jurassic of Kachchh, Western India. II. Bathonian stratigraphy and depositional environment of the Sadhara Dome, Pachchham Island. Beringeria 13 (1994), 115 S., 27,--EUR ABERHAN, M. Early Jurassic Bivalvia of northern Chile. Part I. Subclasses Palaeotaxodonta, Pteriomorphia, and Isofilibranchia. Beringeria 14 (1995), 161 S., 32,--EUR MUSTER, H. Taxonomie und Paläobiogeographie der Bakevelliidae (Bivalvia). Beringeria 15 (1995), 115 S., 30,--EUR UCHMAN, A. Taxonomy and palaeoecology of flysch trace fossils: The Marnoso-arenacea Formation and associated facies (Miocene, Northern Apennines, Italy). Beringeria Sonderheft/Special Issue 2 (1995), 269 S., 48,--EUR GEYER, G. & LANDING, E. (Hrsg.) MOROCCO '95 - The Lower-Middle Cambrian standard of western Gondwana. GEYER, G. & LANDING, E. The Cambrian of the Moroccan Atlas regions. . GEYER, G., LANDING, E. & HELDMAIER, W. Faunas and depositional environments of the Moroccan Atlas regions. . DEBRENNE, F. & DEBRENNE, M. Archaeocyaths of the Lower Cambrian of Morocco. . ZHURAVLEV, A. YU. Preliminary suggestions on the global Early Cambrian zonation. ------------------------------------------------------------------------- MOROCCO '95 · Abstracts of oral and poster presentations ------------------------------------------------------------------------- J. J. ALVARO A general outline of the sedimentary patterns in the Cambrian Iberian basin (Iberian Chains, NE Spain) . O. ELICKI Lower Cambrian faunas from Germany - ages and relations . G. GEYER Cambrian correlations and subdivisions - A pre-meeting viewpoint . R. GOZALO & E. LINAN Leonian (early Middle Cambrian) Paradoxides biostratigraphy . E. LANDING, S. A. BOWRING, S. R. WESTROP & D. COLEMAN High resolution U/Pb dating of the Cambrian: The Avalonian standard . A. R. PALMER Progress on a chronostratigraphy and biostratigraphy for the Early Cambrian of Laurentia . A. ZYLINSKA Trilobites and accompanying fauna in the Cambrian sequence of the Holy Cross Mountains, Poland ----------------------------- SCIENTIFIC REPORTS ----------------------------- GEYER, G. & UCHMAN, A. Ichnofossil assemblages from the Nama Group (Neoproterozoic-Lower Cambrian) in Namibia and the Proterozoic-Cambrian boundary problem revisited. . SHU DEGAN, GEYER, G., CHEN LING & ZHANG XINGLIANG Redlichiacean trilobites with preserved soft-parts from the Lower Cambrian Chengjiang fauna (South China). . LANDING, E., GEYER, G. & HELDMAIER, W. First African lapworthellid: Lapworthella vandali n. sp. from the Lower-Middle Cambrian boundary interval of Morocco. . G. GEYER, W. HELDMAIER & E. LANDING Arthropod traces in the Middle Cambrian of Morocco . . FRIEDRICH, W.-P. Neue Nachweise mittelkambrischer Cincta (Carpoidea, Echinodermata) aus Marokko, Sardinien und Süd-Wales. Beringeria 16 (1995), 348 S., 63,--EUR CHUNLIAN LIU Jurassic bivalve paleobiogeography of the Proto-Atlantic and the application of multivariate analysis methodes to paleobiogeography. . PANDEY, D. K. & CALLOMON, J. H. Middle Bathonian ammonite families Clydoniceratidae and Perisphinctidae from Pachchham Island. . JAITLY, A. K., FÜRSICH, F. T. & HEINZE, M. Contributions to the Jurassic of Kachchh, Western India. IV. The bivalve fauna. Part I. Subclasses Paleotaxodonta, Pteriomorphia, and Isofilibranchia. . METTE, W. Ostracods from the Middle Jurassic of southern Tunisia. Beringeria 17 (1996), 346 S., 63,--EUR DITTMAR, U. Profilbilanzierung und Verformungsanalyse im südwestlichen Rheinischen Schiefergebirge. Beringeria 18 (1996), 245 S., 59,--EUR PATZAK, M. Die Metabasite der KTB-Vorbohrung: Petrographie, Mineralbestand, Geochemie und PT-Bedingungen. . PANDEY, D. K., FÜRSICH, F. T. & HEINZE, M. Contributions to the Jurassic of Kachchh, Western India. V. The bivalve fauna. Part II. Subclass Anomalodesmata. . GEYER, G. The Moroccan fallotaspidid trilobites revisted. . ALMERAS, Y. & ELMI, S. Le genre Cymatorhynchia BUCKMAN (Brachiopoda, Rhynchonellacea) dans le Bajocien-Bathonien de la bordure vivaro-cévenole (Basin du Sud-Est, France). Cadre stratiphique et paléogéographique. Beringeria 19 (1997), 98 S., 38,--EUR GRILL, H. The Permo-carboniferous glacial to marine Karoo record in southern Namibia Beringeria 20 (1997), 218 S., 32 Taf., 59,--EUR HAMMANN, W. & LEONE, F. Trilobites of the post-Sardic (Upper Ordivician) sequence of southern Namibia. Beringeria 21 (1998), 168 S., 32 Taf., 50,--EUR SHA, J., FÜRSICH, F.T., SMITH, P.L. & WAN, L. Palaeotaxodonta, Pteriomorphia, and Isofilibranchia (Bivalvia) from the Jurassic of the Tanggula Mountains, China. . ABERHAN, M. Early Jurassic Bivalvia of western Canada. Part I. Subclass Palaeotaxodonta, Pteriomorphia, and Isofilibranchia. . FÜRSICH, F.T. & HEINZE, M. Contributions to the Jurassic of Kachchh, Western India. VI. The bivalve fauna. Part III. Subclasse Palaeoheterodonta (Order Trigonioida). Beringeria 22 (1998), 199 S., 11 Taf., 54,--EUR HOLZAPFEL, S. Palökologie benthischer Faunengemeinschaften und Taxonomie der Bivalven im Jura von Südtunesien. Beringeria 23 (1999), 123 S., 28 Taf., 43,--EUR AHMAD, F. Middle Jurassic macroinvertebrates from Jordan. NIEBUHR, B. Cyclostratigraphic correlation in Middle Campanian marl/limestone rhythmites of North Germany. GAUCHER, C, & SPRECHMANN, P. Upper Vendian skeletal fauna of the Arroyo del Soldado Group, Urugay. NÜTZEL, A. & SENOWBARI-DARYAN, B. Gastropods from the Late Triassic Nayband Formation of central Iran. Beringeria 24 (1999), 150 S., 76 Text-Abb., 47,--EUR VON RÜTZEN-KOSITZKAU Taphonomie und Biogeographie des hartteiltragenden Makrobenthos im Tiefwasser des Roten Meeres. Beringeria Sonderheft 3 (1999), 204 S., zahlr., z.T. farbige Abb., 20,--EUR FISCHER, H.W.: Naturwissenschaftliches Zeichnen und Illustrieren. Beringeria 25 (1999), 173 S., 20 Taf., EUR 54,-- S. PENG, G. GEYER & B. HAMDI (1999): Trilobites from the Shamirzad section, Alborz Mountains, Iran. A. UCHMAN (1999): Ichnolgy of the Rhenodanubian Flysch (Lower Cretaceous-Eocene) in Austria and Germany. Beringeria 26 (2000), 120 S., 21 Taf., EUR 42,-- C. GAUCHER (2000): Sedimentology, palaeontology, and stratigraphy of the Arroyo del Soldado Group (Vendian to Cambrian, Uruguay). Beringeria 27 (2000), 146 S., 29 Taf., EUR 47,-- D.K. Pandey, F. Ahmad & F.T. Fürsich: Middle Jurassic scleractinian corals from Jordan. A.K. Jaitly, J. Szabo & F.T. Fürsich: Contributions to the Jurassic of Kachchh, western India. VII. The gastropod fauna. Part I. Pleurotomarioidea, Fissurelloidea, Trochoidea and Eucycloidea. F.T Fürsich, M. Heinze & A.K. Jaitly: Contributions to the Jurassic of Kachchh, western India. VIII. The bivalve fauna. Part IV. Subclass Heterodonta. Beringeria 28 (2001), 105 S., 22 Taf., EUR 42,-- A. Uchmann: Eocene flysch trace fossils from the Hecho Group of the Pyrenees, northern Spain. G. Delvene: Middle and Upper Jurassic bivalves from the Iberian Range, Spain. Beringeria 29 (2001), 181 S., 37 Taf., EUR 63,-- M. Hautmann: Die Muschelfauna der Nayband-Formation (Obertrias, Nor-Rhät) des östlichen Zentraliran. Beringeria 30 (2002), 144 S., EUR 48,-- F. Holzförster: Sedimentology, stratigraphy and synsedimentary tectonics of the Karoo Supergroup, N-Namibia. Beringeria 31 (2002), 204 S., 7 Taf., EUR 72,-- M.E. Gahr: Palökologie des Makrobenthos aus dem Unter-Toarc SW-Europas. Beringeria 32 (2003), 138 S., 40Taf., EUR 48,-- D.K. Pandey & F.T. Fürsich: Jurassic corals from east-central Iran. Beringeria 33 (2003), 86 S., 8Taf., EUR 34,-- H. Scholz: Taxonomy, ecology, ecomorphology, and morphodynamics of the Unionida (Bivalvia) of Lake Malavi (East Africa). Beringeria Sonderheft 4 (2003): D. KLEINSCHROT: (2003): Meteorite - Steine, die vom Himmel fallen. - 89pp.; zahlr., z.T. farbige Abb.; Würzburg. Beringeria 34 (2004), 154 S., 31 Taf., EUR 54,-- W. Mette: Deciphering and interpreting Jurassic diversity and distribution trends for marine ostracods in Gondwana - the role of biologic, endogenous and exogenous processes. W. Mette & M. Geiger: Bajocian and Bathonian ostracods and depositional environments in Madagascar (Morondava Basin and southern Majunga Basin). W. Mette & M. Geiger: Taxonomy and palaeoenvironments of Callovian ostracoda from the Morondava Basin (south-west Madagascar). W. Mette & M. Geiger: Middle Oxfordian to early Kimmeridgian ostracoda and depositional environments of south-west Madagascar. M. Aberhan: Early Jurassic Bivalvia of northern Chile. Part II. Subclass Anomalodesmata. Beringeria 35 (2005), 135 S., 13 Taf., EUR 52,-- H. Scholz: Taxonomie der Bivalven aus dem Oberjura von Hildesheim. F.T. Fürsich, M. Hautmann, B. Senowbari-Daryan & K. Seyed-Emami: The Upper Triassic Nayband and Darkuh formations of east-central Iran: Stratigraphy, facies patterns and biota of extensional basins on an accreted terrane. D.K. Pandey & F.T. Fürsich: A new name for the Jurassic coral genus Irania Pandy & Fürsich 2003. [nomenclatorial note] Beringeria-Sonderheft 5 (2005), Teil I + II: BERINGER, J.B.A. & HUEBER, G.L.: Lithographiae Wirceburgensis. Nachdruck der 1. Auflage 1726 mit 10 S. Zueignung und 5 S. Corollaria Medica von G.L. Hueber sowie 98 S., 22 Taf. und 1 S. Erratum zu den Figurensteinen von J.B.A. Beringer. - Beringeria Sonderheft 5, Teil I; Würzburg. 45,--EUR B. NIEBUHR & G. GEYER: Beringers Lügensteine: 493 Corpora Delicti zwischen Dichtung und Wahrheit . - Beringeria Sonderheft 5, Teil II: 188 S., 506 Fig.; Würzburg. 25,--EUR Beringeria - in Vorbereitung / in prep. last update: 18.10.2005.

 

 

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Ausgewählte Zusammenfassungen - Selected Abstracts

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ABERHAN, M. 1992
Palökologie und zeitliche Verbreitung benthischer Faunengemeinschaften im Unterjura von Chile.
Beringeria 5: 3-174, 66 Abb., 1 Tab., 2 Taf.; Würzburg.

Abstract. The facies and faunal distribution of 6 characteristic sections in the marine Lower Jurassic of the Andean basin of Northern Chile has been analysed applying sedimentological, taphonomic, and palaeoecological evidence. The depositional environments are interpreted to correspond to a ramp model in which facies and fauna are organized in bands more or less parallel to the coastline which grade continuously into each other. 202 bulk collections of benthic macroinvertebrates, dominated by bivalves and brachiopods, were grouped into 27 associations by means of a Q-mode cluster-analysis. The associations represent the autochthonous or parautochthonous relics of ancient communities. They are - together with seven assemblages - described quantitatively and their environments are discussed. The environments were ranging from shallow nearshore sand bars, shallow shelf mixed siliciclastic-carbonate substrates to consolidated offshore mid shelf carbonates and finally to fine-grained deep shelf sediments. The spatial distribution of the fauna has been governed primarily by physical parameters such as rate of sedimentation, grain-size and substrate consistency, energy level, and oxygen supply. Biological interactions such as trophic group amensalism have been less important. Along an onshore-offshore gradient, changes of the physical environment can be correlated with faunal changes. The within-habitat temporal distribution pattern of dominating species has been controlled by ecological replacement of unrelated species. Ecological replacement occurs within different life habit groups and different habitats and can be correlated with transgressive-regressive cycles. Within-habitat temporal distribution patterns of associations can be interpreted with a concept of parallel and alternating associations in time. Both types of associations exhibit an analogous composition of life habit groups. However, while parallel associations replace each other irreversibly within longer time periods, alternating associations are characterized by short-term alternations. Using additional quantitative data from the literature, the evolution of marine benthic shelf-communities can be traced throughout the Jurassic. Assemblages of life habit groups are established for defined habitats and time intervals, using a Q-mode cluster-analysis. Individual habitats (salinity-controlled environments, shallow shelf, deep shelf, oxygen-controlled environments) differed according to dominance and diversity of life habit groups. A feature common to all environments was the evolutionary stability of dominating life habit groups and morphotypes. Moreover evolutionary trends can be traced, in particular the increased percentage of shallow-burrowing suspension-feeding bivalves from the Late Jurassic onwards.

Keywords: Jurassic, macrobenthos, association, palaeoecology, oxygen, life habit groups, evolution, facies, Northern Chile.

Address of the author:
MARTIN ABERHAN, Institut für Paläontologie der Universität Würzburg, Pleicherwall 1, D-97070 Würzburg.


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HAMMANN, W. 1992
The Ordovician trilobites from the Iberian Chains in the province of Aragón, NE-Spain. I. The trilobites of the Cystoid Limestone (Ashgill Series).
Beringeria 6: 3-219, 37 text-figs., 5 tabs., 37 pls.; Würzburg.

Abstract. In the systematic part the trilobite fauna from the Cystoid Limestone Formation of the Eastern Iberian Chains, Aragón, NE Spain, is described. It comprizes thirty four genera with forty three species. New genera are Snajdria n. gen. (Illaenidae) with the species Snajdria foveolata n. gen., n. sp. and Hispaniaspis n. gen. (Odontopleuridae) with Hispaniaspis dereimsi n. gen., n. sp. New species of known genera are Parillaenus ? creber n. sp., Thaleops inflata n. sp., Cekovia perplexa n. sp. with two subspecies Cekovia perplexa perplexa n. ssp. und Cekovia perplexa tenuis n. ssp., Alceste rugosa n. sp., Cyrtometopus ? meridianus n. sp., Pseudosphaerexochus ? nullicauda n. sp., Heliomera (Heliomeroides) crassilobata n. sp., Diacanthaspis conica n. sp., Diacanthaspis margaritata n. sp. and Calipernurus ? immanis n. sp. - Stratigraphy. In each of the two facies of the Cystoid Limestone Formation two members are defined, which are from base to top: La Peña Member and Rebollarejo Member of the calcareous Western facies, and the Ocino Member and Rebosilla Member of the argillaceous Eastern facies, respectively. The Rebollarejo Member contains two biozones, of which the upper one with Holdenia insculpta can be correlated with similar limestones of Rawtheyan age from the British Isles. The lower part of the Rebollarejo Member as well as the underlying La Peña Member approximately correspond to the higher Pusgillian and Cautleyan. The Rebosilla Member mostly corresponds to the Rawtheyan as well and can be compared by means of Ovalocephalus cf. tetrasulcatus and other trilobites that occur in Poland and Sardinia; there are, however, time discrepancies with regards to Turkish faunas. - Palaeobiogeography. The trilobite fauna of the Cystoid Limestone Formation comprizes elements which are derived from the local Selenopeltis Province on the one hand but also immigrants from the Chinese part of Gondwana and from lower latitudes of Baltica and Laurentia. Baltic and Laurentian elements are found mainly in the limestones of the Western facies, while Chinese genera preferably occur in the argillaceous Eastern facies. - Palaeoecology. The fauna of the Cystoid Limestone Formation is largely dominated by suspension feeders such as bryozoans and pelmatozoans. This is also true for trilobites with strong dominance of Illaenidae. This, as well as the microfacies, indicates slightly agitated, shallow marine condition not far below the wave base. Apart from illaenines the trilobite assemblage mainly contains Cheirurina, Odontopleurida und Lichida and therefore can be attributed to the `illaenid-cheirurid community' which characterizes shelf carbonate buildups. The special environment of the Rebollarejo Member is an intrashelf buildup while the Rebosilla Member links it with the basinal facies of the outer shelf. Ashgillian carbonate buildups of the northern Gondwana platform are characterized by trilobite associations dominated by Cekovia. Shallow shelf buildups contain the Cekovia-Parillaenus association, while deep shelf buildups are characterized by the Cekovia-Symphysops association. A similar bathymetrical sequence can be found in the siliciclastic basinal facies of the outer shelf, with a dominance of Ovalocephalus. While the more shallow marginal facies contains the the Ovalocephalus-Lichas association, the deep distal facies contains the Ovalocephalus-Symphysops association. This allows a bathymetric attribution of different Ashgillian faunas. - Palaeogeography. A general palaeogeographical concept is proposed to explain the facies of the Cystoid Limestone. Prerequisite for an understanding is the tectono-sedimentary development of the North African shelf of Gondwana since the Cambrian, which is as follows: formation of a miosynclinal trough within the shelf and beginning separation of Avalonia in Late Middle Cambrian to Lower Arenigian times, with possibilities of faunal exchange, however. Uplift of this trough and formation of a land barrier, the `Sardinian-Taurian Rise', during Llanvirnian-Llandeilian times. This rise is considered responsible for an isolation of the Neseuretus-fauna of the North Gondwana shelf seas during the Middle Ordovician. The break-down of the Sardinian-Taurian Rise by rifting and formation of the Rheic Ocean during the Caradocian and Ashgillian lead to the northern drift of Avalonia and finally to the successive disappearance of the Selenopeltis Province by a warming-up of waters along the southern margin of the Rheic and invasion of new faunas. This process reached its peak with the formation of a carbonate platform and a cosmopolitan fauna.

Keywords: Ordovician, Ashgillian, trilobites, stratigraphy, palaeoecology, palaeogeography, Spain, Mediterranean region.

Address of the author:
WOLFGANG HAMMANN, c/oInstitut für Paläontologie der Universität Würzburg, Pleicherwall 1, D-97070 Würzburg.


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FRIEDRICH, W.-P. 1993
Systematik und Funktionsmorphologie mittelkambrischer Cincta (Carpoidea, Echinodermata).
Beringeria 7: 3-190, 21 Abb., 24 Taf.; Würzburg.

Abstract. The species of the Class Cincta, from the Middle Cambrian of Morocco, northern Spain, southern France, Germany and the Czech Republic, are studied morphologically and systematically revised. Several new taxa are introduced: Sucocystis bretoni n. sp., S. undata n. sp., S. acrofera n. sp., S. quadricornuta n. sp., Progyrocystis n. g. with P. disjuncta n. g. n. sp., Gyrocystis badulesiensis n. sp., G. erecta n. sp., G. testudiformis n. sp., Davidocinctus n. g. with D. pembrokensis n. g. n. sp. and Ludwigicinctus n. g. with L. truncatus n. g. n. sp. A previously unknown cinctan from northern Spain is described but left in open nomenclature as n. g. n. sp. A. The Class Cincta are here divided, essentially on the basis of the different lengths of the epithecal grooves, into the families Trochocystitidae (emend.), Sucocystidae (n. fam.) and Gyrocystidae (emend.). The original material of BARRANDE (1887), JAEKEL (1918b) and GISLEN (1927) is restudied. Decacystis hispanica GISLEN 1927 is shown to be probably a junior synonym of Gyrocystis platessa JAEKEL 1918. Photographs of the type material of these two taxa, or of latex casts of the type material, are given here for the first time. On the basis of a latex mould of the decalcified holotype of Gyrocystis ? melendezi SCHROEDER 1973, which shows the morphology considerably better than before, the species is assigned to the genus Sucocystis CABIBEL, TERMIER & TERMIER 1959. Moulds of the available material used by TERMIER & TERMIER (1973) are illustrated here and the individual taxa revised. Trochocinctus pardailhanicus TERMIER & TERMIER 1973 is probably a synonym of Sucocystis melendezi (SCHROEDER 1973), while Cephalocinctus labiatus TERMIER & TERMIER 1973 and Cyclocinctus subcircularis TERMIER & TERMIER 1973 are synonyms of Elliptocinctus barrandei (MUNIER-CHALMAS & BERGERON 1889). The holotype of Decacystis praeellipticus TERMIER & TERMIER 1973, which is an incomplete impression of the lower side of the theca, belongs to the family Sucocystidae but cannot be more closely identified. The holotype of Cyclocinctus maroccanus is assigned to the Sucocystidae as Sucocystis ? maroccana (TERMIER & TERMIER 1973). Davidocinctus pembrokensis n. g. n. sp. from South Wales is the first known representative of the Cincta from the British Isles. Detailed reconstructions are given of almost all the species here described. And these reconstructions, together with model experiments in a flume and a taphonomic analysis, produce a new interpretation of the mode of life and functional morphology. The operculum was probably the outlet valve of a peribranchial chamber. In addition to the mouth and the anal pyramid, another thecal opening is suspected to exist. It is in the right half of the theca and may represent a hydropore-gonopore. Cincta were probably internal filter feeders living in a low-energy environment. They belonged to the epifaunal benthos and probably lay free on the substrate. They were most likely capable mainly of passive movement, dictated by bottom currents. For in flume experiments with transported sediment and a single current direction, models regularly arrange themselves with the labrum, which covered the mouth opening, downstream and the stele upstream. By inserting the end of the stele in the sediment, however, the organisms may have been able actively to favour this orientation. Food particles would be captured, by preference, on the downstream side of the animal.

Keywords: Carpoidea, Cincta, systematics, reconstruction, functional morphology, Middle Cambrian.

PANDEY, D. K. & FÜRSICH, F. T. 1993
Contributions to the Jurassic of Kachchh, Western India. I. The coral fauna.
Beringeria 8: 3-69, 24 text-figs., 11 pls.; Würzburg.



Abstract. The coral fauna from Bathonian-Oxfordian strata of Kachchh, Western India, originally described by GREGORY (1900), is revised. Based on large own collections, 52 taxa of corals are described including Cryptocoenia wegeneri sp. nov.. By far the most prolific coral locality lies within the upper part of the Patcham Formation (Late Bathonian/Early Callovian) at the center of Jumara Dome and yielded 41 taxa. The distribution of the various taxa within the Kachchh Basin is given, as is information on the major coral concentrations.


Keywords: Jurassic, corals, taxonomy, Kachchh

Addresses of the authors:
D. K. PANDEY, Dept. of Geology, University of Rajasthan, Jaipur 302 004, Rajasthan, India;
F. T. FÜRSICH, Institut für Paläontologie der Universität Würzburg, Pleicherwall 1, D 97070 Würzburg, Germany.

D'ALESSANDRO, A. & DE MARCO, A. 1993
Bionomic analysis of two Upper Pliocene communities from southern Italy.
Beringeria 8: 109-137, 15 figs., 11 tab.; Würzburg.



Abstract. Thick, structureless muddy sediments of Late Pliocene age, belonging to the Subapennine Clay Formation, locally contain mollusc-dominated benthic faunas. One of several sandy intercalations represents an ash bed, an important index horizon within the area. The great abundance of the mud-pecten, Delectopecten abyssorum, associated with this traumatic event, provided a reason for studying these assemblages, and comparing them with the very scattered background assemblage. A protobranch/Siphonodentaliidae community and a protobranch/mud-pecten community were distinguished, both mirrored in the Recent bathyal mud biocoenosis. The ecological meaning of the protobranch/mud-pecten community differs according to its occurrence; at Salandrella the community seems to represent a single colonizing event following the ash deposition, whereas at Granatella it seems to record a stable community.

Keywords: Carpoidea, Cincta, systematics, reconstruction, functional morphology, Middle Cambrian.Upper Pliocene, molluscs, bathyal palaeocummunities, Italy

Addresses of the authors:
A. D'ALESSANDRO, Dipartimento di Geologia e Geofisica; A. DE MARCO, Dipartimento di Geomineralogia, Campus Universitario, 70125 Bari, Italy.

SHA JINGENG & FÜRSICH, F. T. 1993
Bivalve faunas of eastern Heilongjiang, northeastern China. I. Non-marine Bivalvia of the Xiachengzi Formation (Lower Cretaceous).
Beringeria 8: 139-187, 24 text-figs., 7 pls.; Würzburg.



Abstract. Early Cretaceous non-marine bivalves from the Middle Member of the Xiachengzi Formation, Xiachengzi and Yilin areas (Muling prefecture) of eastern Heilongjiang, northeastern China, are described, the classification of trigonioidids and the age of the non-marine fauna are discussed, as are the taphonomy and ecology of Trigonioides (T.) heilongjiangensis. The fauna consists of 13 taxa, including 2 new species, Unio heilongjiangensis and Sphaerium ? mulingense. Specimens of T. (T.) heilongjiangensis occur in various states of preservation which are probably related to the depositional environment, the lithology, and subsequent diagenesis. Because of its large and muscular foot and well developed adductor and pedal retractor muscles T. (T.) heilongjiangensis is interpreted as a rapid burrower. The optimum conditions for T. (T.) heilongjiangensis are thought to have been soft substrates of shallow, well aerated, low energy lakes of low turbidity. In trigonioidids the pedal retractor muscle is distinctly separated from the adductor muscle. This feature is regarded as significant enough to place trigonioidids in the superfamily Trigonioidacea. This superfamily can be subdivided into 4 families, 7 subfamilies, and 26 genera and subgenera. Two new subgenera, Eokoreanaia and Latiplicatounio, have been erected. A key and a dendrogram to identify members of the superfamily are proposed.

Keywords: Trigonioides, bivalves, Lower Cretaceous, northeastern China, taxonomy, autecology

Addresses of the authors:
JINGENG SHA, Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008, P.R. China
F. T. FÜRSICH, Institut für Paläontologie der Universität Würzburg, Pleicherwall 1, D 97070 Würzburg, Germany.

SDZUY, K. 1993
Early Cincta (Carpoidea) from the Middle Cambrian of Spain.
Beringeria 8: 189-207, 6 text-figs., 3 pls.; Würzburg.



Abstract. Sotocinctus ubaghsi n. gen., n. sp., Trochocystoides planus n. sp. and Asturicystis jaekeli n. gen., n. sp. from the Cantabrian region (NW-Spain) are described. They occur in beds with Badulesia which correspond to the top of the P. oelandicus stage and the early P. paradoxissimus stage. They, therefore, probably represent the earliest Cincta known and some of their characters are interpreted as primitive (plesiomorph). They show the labrum and (in S. ubaghsi) the anal pyramid well preserved.

Keywords: Middle Cambrian, Mediterranean, Carpoidea, Cincta, Spain

Address of the author:
K. SDZUY, c/o Institut für Paläontologie der Universität Würzburg, Pleicherwall 1, D 97070 Würzburg, Germany.

VAšÍÈEK, Z., MICHALÍK, J. & REHÁKOVÁ, D. 1994
Early Cretaceous stratigraphy, palaeogeography and life in Western Carpathians.
Beringeria 10: 3-169, 28 text-figs., 1 tab., 30 pls.; Würzburg.



Abstract. Submitted work summarizes the results of lithological, lithostratigraphic, sedimentological, biostratigraphic, palaeobiological and palaeobiogeographic studies of the uppermost Jurassic-Lower Cretaceous sequences of the Outer and Central Western Carpathians, forming a part of the Slovakian, Czech (and also of the Polish) territory. Attention is paid to systematic evaluation of stratigraphically important groups of fossils, represented mainly by cephalopods (ammonites, aptychi, as well as belemnites) of which 79 species and subspecies are described in the chapter on taxonomy. The new taxa are Lamellaptychus filicostatus fractocostatus and L. aplanatus latus. The Carpathian cephalopod zonation has been checked and/or complemented by calpionellid parabiostratigraphy, which is the most useful additional tool for subdividing the uppermost Jurassic-early Lower Cretaceous deposits, where cephalopods are rare. The biostratigraphic zonation based on calcareous dinoflagellates, radiolarians, nannoplankton and planktonic foraminifers, may serve as an additional tool for more precise dating of the pelagic sequences. On the other hand, the distribution of algae, benthic foraminifers, to some extent also of brachiopods and crinoids, contributes to the dating of shallow carbonate platform deposits. Despite occasional Early Valanginian-Late Hauterivian immigration of Boreal ammonites, the Western Carpathians belonged to the Mediterranean faunal province during the Lower Cretaceous. The periodic connection between the Mediterranean and the Boreal Realm was interrupted during Barremian times. The majority of early Lower Cretaceous sequences is represented by the so-called Neocomian facies. Elevations produced by Late Hauterivian and Barremian tensional stress are characterized by organogenous "Urgonian" limestone, that is carbonate platform sediments, while argillaceous deposits similar to black shales prevailed in rifted basins. Carbonate platform sedimentation ceased during the Middle Albian "collapse" of the area. Later on, pelagic shales passing upwards into flysch deposits prevailed in all basins.

Keywords: Early Cretaceous, Cephalopoda, taxonomy, microplankton, associations, biostratigraphy, lithostratigraphy, palaeogeography, Western Carpathians, Czech and Slovak Republic.

Addresses of the authors:
ZDENÌK VAšÍÈEK, Department of Geology and Mineralogy, Mining University, Tø. 17. listopadu, 708 33 Ostrava-Poruba, Czech Republic.
JOZEF MICHALÍK, DANIELA REHÁKOVÁ, Geological Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 84226 Bratislava, Slovak Republic.

HÜSSNER, H. 1994
Reefs, an Elemantary Principle with many Complex Realizations.
Beringeria 11: 3 - 97, 39 Text-figs., 3 Tabs., 11 Pls.; Würzburg.



Abstract: In this work reefs are viewed as the result of self enhancing feedback circuits. Reef growth comprises enhanced production of carbonate compared to the surroundings and a better fixation of this carbonate as compared to the surroundings. Moreover both of these elementary principles of reef-growth enforce each other. This makes reefs different from physically dominated sedimentary processes. In reefs biological programs in multigeneration communities dominate the sedimentation process, which demand and allow upward growth rather than isotropic distribution. These principles are demonstrated in four case studies. Case study 1 refers to the oldest reefs on earth, to stromatolites and their biological programs leading to reef growth. Case study 2 deals with Lower Devonian mud mounds, their faunal content, sedimentary structures and a genetic model. The mounds are not just due to improved baffling capacities of their fauna, but result from a self-enhancing feedback circuit of carbonate production and carbonate stabilization. Stromatactis fabrics, a conspicuous feature in these mounds, are related to storm events. Case study 3 presents modern coral reefs off Cozumel (Mexico). Faunal and floral content as well as form and distribution of the reefs are described. The distribution of these reefs shows both, deterministic and random factors. Again there is a self- enhancing feedback circuit of carbonate production and carbonate stabilization, with corals and algae as the main actors. Case study 4 is devoted to modern mud banks from Florida Bay (USA). Investigation of sediment cores leads to a new genetic model related to the specific requirements and features of seagrass. A brief review of the evolution of human thinking tries to illuminate the roots of basic assumptions in geology and biology and their relation to reef models. Pure causal explanations do not leave room for chance and feedback circuits which are so important in the formation of reefs. In this context the principle of uniformitarianism is discussed and it is stated that it should not be abrogated but handled with care. The principle can be applied to physical, chemical and biological factors but reliability decreases in this order. Because the comparison of different reefs and reef builders in this work relates to organismic responses to basic, mainly physical, factors of the environment, such a comparison is well in accordance with a natural science, that is conscious about the fact that its objects under study all have a history. Some of the basic ideas that have been introduced into science in the past decades, such as cybernetics and synergetics open new ways also to reef research. The general reef model discussed in the final chapter tries to unify what has been learned from the case studies and from other reefs. From the Precambrian to the Holocene we observe comparable patterns in reef formation despite the huge diversity of organisms that contributed to construct what we call reefs today. Fundamental to all reef constructions is the self-enhancing feedback circuit of carbonate production and carbonate fixation. Once sparked, the mutual enhancement of both factors maintains reef growth unless it is discontinued by a major perturbation. The difference between physically dominated sedimentation in non-reef areas and biologically controlled sedimentation in reefs, makes this kind of bioconstruction unique among sedimentation processes. The strict discrimination of these processes may be looked upon as a natural definition of reefs.


Keywords: Devonian, Triassic, Holocene, reefs, reef ecology, mud mounds, mud
banks, evolution of reefs, self-organization, uniformitarianism,
stromatolites, coral/algal reefs, Morocco, Mexico, Florida

FÜRSICH, F. T., PANDEY, D. K., CALLOMON, J. H., OSCHMANN, W. & JAITLY, A. K. 1994
Contributions to the Jurassic of Kachchh, Western India. II. Bathonian stratigraphy and depositional environment of the Sadhara Dome, Pachchham Island.
Beringeria 12: 95-125, 7 text-figs., 1 tab., 2 pls.; Würzburg.



Abstract. At Sadhara Dome near the eastern end of Gora Dongar, Pachchham, Kachchh, Middle to Late Bathonian rocks are well exposed. They consist largely of unfossiliferous siliciclastics with two intervals of highly fossiliferous, mixed carbonate-siliciclastic sediments. Lithostratigraphically, the rocks have been assigned in a revised classification to the Khavda (lower) and Patcham Formations (higher). The latter is represented by the Raimalro Limestone Member. Within the Khavda Formation, six members are recognized, four of them informal ones. In descending order they are the Gadagupta Sandstone Member, the Goradongar Yellow Flagstone Member, the Middle Sandstone member, the Lower Yellow Flagstone member, the Eomiodon Red Sandstone member, and the Sadhara Coral Limestone member. The sedimentary succession and its faunal content are described in detail. Four facies-associations are recognized, representing nearshore bar complexes, semi-enclosed brackish bays grading into non-marine coastal plains, nearshore storm-dominated shallow shelf, and transgressive lags. Three benthic associations and one assemblage can be distinguished. The Eomiodon indicus-Protocardia sp. association characterizes brackish bays; the Placunopsis socialis -Eomiodon indicus association, the `Corbula' lyrata association and the Modiolus imbricatus assemblage reflect fully marine, shallow shelf conditions. The Bathonian sediments at Sadhara record several shallowing-deepening phases, often in form of asymmetric sedimentary hemicycles. Their genetic history cannot at present be evaluated with certainty, as precise correlations with rocks of comparable age from other parts of the Kachchh `Island Chain' have not yet been established.

Keywords: Jurassic, biostratigraphy, lithostratigraphy, palaeoecology, palaeoenvironments, Western India.

Addresses of the authors:
F. T. FÜRSICH, Institut für Paläontologie der Universität Würzburg, Pleicherwall 1, D-97070 Würzburg, Germany; D. K. PANDEY, Dept. of Geology, University of Rajasthan, Jaipur 302 004, Rajasthan, India;
W. OSCHMANN, Institut für Geologie und Paläontologie der Universität Tübingen, Sigwartstr. 10, D-72076 Tübingen, Germany;
J. H. CALLOMON, Dept. of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, England;
A. K. JAITLY, Dept. of Geology, Banaras Hindu University, Varanasi 221005, India.

ABERHAN, M. 1994
Early Jurassic Bivalvia of northern Chile. Part I. Subclasses Palaeotaxodonta, Pteriomorphia, and Isofilibranchia.
Beringeria 13: 3-115, 20 figs., 1 tab., 28 pls.; Würzburg.



Abstract. Seventy-seven taxa of bivalves from the Early Jurassic of northern Chile, belonging to the orders Nuculoida, Arcoida, Pterioida, Limoida, Ostreoida, Pectinoida, and Mytiloida are described and discussed. Three species are new: Palaeonucula cuevitana, Grammatodon (Grammatodon) sulcatus, and Modiolus (Modiolus) chilensis. Many taxa, which are also known from the Jurassic of Europe, are for the first time recorded and illustrated from the South American subcontinent. The study is based on several thousand specimens from more than 50 fossiliferous localities in northern Chile. An excellent biostratigraphic control of the bivalves based on associated ammonites greatly improves our knowledge of the stratigraphic range of many species.

Keywords: Jurassic, bivalves, taxonomy, northern Chile

MUSTER, H. 1995
Taxonomie und Paläobiogeographie der Bakevelliidae (Bivalvia).
Beringeria 14: 3-161, 88 Abb., 10 Tab., 17 Taf.; Würzburg.



Abstract. The predominantly epibyssate Bakevelliidae (KING 1850) of the order Pterioida are a family of the Bivalvia, which originated in the Late Permian and flourished in the Jurassic. The bakevelliids are characterized by a usually rhombic to trapezoidal outline with a more or less pronounced posterior wing. Below the distinct ligamental area with several ligament pits there are teeth, whose number and shape varies considerably. The reason for the large number of nominal species is the high variability within the family. The taxonomic revision of the Bakevelliidae resulted in a reduction of the genera and subgenera from 36 to 15. Within these, 40 of originally 265 species could be accommodated. Diagnostic features are the outline (defined here by the parameters diagonal, maximum length of the body, length of the posterior wing, and obliquity), the shell ornamentation, wing shape, position and shape of the umbones, the hinge, and muscle scars. Due to their poor preservation, a certain percentage of the species found in the literature could not be evaluated. These have been grouped, as far as possible, into 17 morphotypes. As a result of their planktotrophic larvae, the palaeobiogeographic analysis of the members of the family showed a strong relationship between dispersal pattern and prevailing marine current systems. The main distribution of the species lies within the Tethyan Ocean. Dispersal routes of individual species along the northern margin of the Tethys point to a W-E directed current, which turns towards south into an E-W directed equatorial current. In the Late Triassic, some species managed to migrate, before the opening of the Hispanic Corridor, from the Tethys to South America. It is here assumed that these species crossed the Pacific from West to East along equator-parallel currents. The successive break-up of the eastern and western segments of Gondwana, which led to the establishment of the South African Seaway and thus to a marine connection to South America in the Later Jurassic, can be reconstructed using the dispersal pattern of the Bakevelliidae. The dispersal pattern of individual species of the Bakevelliidae apparently was not influenced by facies. Due to the great mobility of the family, even distant regions could be reached so that facies influenced the dispersal pattern only at a regional scale. The degree of endemism is relatively low. Some endemic species are characterized by a strong torsion of the shell, most likely an adaptation to extreme environmental conditions. The palaeobiogeographic distribution pattern of the Bakevelliidae does not correspond to faunal provinces defined by ammonites.

Keywords: Bakevelliidae, Taxonomy, Palaeobiogeography, Jurassic

UCHMAN, A. 1995
Taxonomy and palaeoecology of flysch trace fossils: The Marnoso-arenacea Formation and associated facies (Miocene, Northern Apennines, Italy).
Beringeria 15: 3-115, 33 text-figs., 16 pls.; Würzburg.



Abstract. Nomenclature of ichnotaxa, and differences and affinities between forms described hitherto as Granularia, Alcyonidiopsis, and Ophiomorpha; Nereites, Neonereites, Scalarituba, Helminthoida, and Helminthorhaphe; Scolicia, Subphyllochorda, Taphrhelminthopsis and Bichordites; Hormosiroidea and Saerichnites; Desmograpton, Paleodictyon are extensively discussed on the basis of diverse ichnoassemblages from turbiditic and pelagic sediments of the Miocene Marnoso-arenacea Formation of the Northern Apennines. As a result, many ichnotaxa are redefined and revised. Channelized turbidites of the inner fan of the Marnoso-arenacea Formation (Tortonian) are poorly bioturbated and contain almost exclusively rare Ophiomorpha and Thalassinoides. The low ichnodiversity is a result of low preservation potential, high rate of sedimentation, elimination of many grain-size specific forms, and probable deterioration of oxygenation during the Tortonian. Non-channelized turbidites of the outer fan-basin plain (Langhian-Serravallian) are characterized by commonly heavily bioturbated top layers of turbidites and a highly diverse ichnoassemblage including numerous graphoglyptids, crustacean and echinoid burrows. The ichnoassemblage typifies relatively well oxygenated palaeoenvironments colonized by deep-tier, R-selected opportunistic multi-layer colonizers (Ophiomorpha, Thalassinoides, Trichichnus, Chondrites), as well as by shallow-tier, K-selected single layer colonizers (Scolicia strozzii, graphoglyptids). A less diverse ichnoassemblage occurs in the submarine high facies of the Verghereto Marls. The slope deposits of the Borgo Tossignano Marls contain a low diversity ichnoassemblage dominated by Chondrites and Planolites. Both units are almost totally bioturbated. Similarly, the Laga Formation (Messinian-Lower Pliocene) exhibits a low diversity ichnoassemblage (only Planolites, Scolicia strozzii, and Teredolites). The low ichnodiversity is probably a result of a low preservation potential, hypersalinity, and poor oxygenation of stratified waters during the Messinian crisis.

Keywords: Trace fossils, deep-sea sediments, palaeoecology, Miocene, Apennines, Italy

GEYER, G. & LANDING, E. 1995
The Cambrian of the Moroccan Atlas regions.
Beringeria Special issue 2: 7-46, 14 text-figs.; Würzburg.



Abstract. The characteristics of the Cambrian of the Moroccan Atlas regions are described and illustrated. Such major depositional controls as "Grand cycles" and tectonic environments are discussed briefly. The lithostratigraphic units for the uppermost Proterozoic(?) to the Upper Cambrian of the Moroccan Anti-Atlas and High Atlas mountains are reviewed and partly revised. The descriptions characterize lithology, depositional environment, fossil content, and synonymy of each lithostratigraphic unit. The Jbel Tichinchine Formation is abandoned. The bio- and chronostratigraphy of the Atlas regions are summarized with their (formal and informal) subdivisions including new biostratigraphical units in the Middle Cambrian. Detailed stratigraphy permits a recognition of evidence for diachroneity of several formational contacts. Controversial data and problems of the Moroccan Precambrian-Cambrian boundary are discussed in detail. The available evidence does not permit any degree of certainty in correlations even at the stage-level with Lower Cambrian sections on other Cambrian continents.

Keywords: Uppermost Proterozoic, Lower Cambrian, Middle Cambrian, Upper Cambrian, lithostratigraphy, environment, biostratigraphy, chronostratigraphy, diachroneity, Morocco.

GEYER, G., LANDING, E. & HELDMAIER, W. 1995
Faunas and depositional environments of the Moroccan Atlas regions.
Beringeria Special issue 2: 47-119, 26 text-figs.; Würzburg.



Contents:

May 3. Tiout Section
May 4. Tazemmourt Section
May 5. Amouslek Section
May 6-7. Lemdad Syncline
May 6. Section Le I
May 6. Section Le II
May 6. Section Le IV
May 7. Section Le XI
May 7. Fossil record of additional sections
May 8. Sirwa region
May 8. Id Boukhtir section
May 9. Section Aït Saoun-Tizi n'Tinififft
May 9. Ourika Wawrmast sections
May 10. Jbel Arhouri section
May 11. Tarhoucht section

 

DEBRENNE, F. & DEBRENNE, M. 1995
Archaeocyaths of the Lower Cambrian of Morocco.
Beringeria Special Issue 2: 121-145, 3 text-figs., 4 tabs., 4 pls.; Würzburg.



Abstract. Archaeocyaths from Morocco have been described from various localities and attributed to lithostratigraphic or biostratigraphic units, the name of which varies between authors and has created great confusion. Since their first descriptions, generic assignments have been revised and new concepts for species reduced their number. The present article gives an overview of the biostratigraphy of the archaeocyathan faunas of Morocco and their position in revised litho- and biostratigraphic schemes. The palaeogeography is outlined for Morocco and southwestern Europe. A tentative correlation chart synchronizes archaeocyath and trilobite biostratigraphic scales in Morocco and establishes a comparison with the stages used for the Siberian Platform. Key sections for archaeocyath faunas and a revised list of Moroccan archaeocyath species are presented.

Keywords: Archaeocyaths, Lower Cambrian, Morocco, list of species, palaeogeography, biostratigraphy, paleobiogeographical position

ZHURAVLEV, A. YU. 1995
Preliminary suggestions on the global Early Cambrian zonation.
Beringeria Special issue 2: 147-160, 2 tabs.; Würzburg.



Abstract. Integrated faunal and floral data permit to distinguish eleven correlative units for the Early Cambrian. Three of them are restricted to the pre-trilobite Cambrian; two belong to the Atdabanian Stage; three are recognizable in the Botomian and three in the Toyonian Stages. Some of the units embrace several zones of different stages, others correspond to a single zone. The lengths of the units decrease from the base to the top of Lower Cambrian. Although there are few cosmopolitan forms in the Lower Cambrian, numerous fossils are in common for two or more regions. The lateral extension of assemblages of such fossils provides a possibility for parsimonious definition of each correlative unit in remote regions.

Keywords: Early Cambrian, biostratigraphy, global correlation.

GEYER, G. & UCHMAN, A. 1995
Ichnofossil assemblages from the Nama Group (Neoproterozoic-Lower Cambrian) in Namibia and the Proterozoic-Cambrian boundary problem revisited.
Beringeria Special issue 2: 175-202, 10 text-figs., 1 tab.; Würzburg.



Abstract. Ichnofossil assemblages from the Schwarzrand and Fish River Subgroups of the Nama Group are described. They include Enigmatichnus africani CRIMES & GERMS 1982, Gordia? isp. A, Gordia isp. B, Skolithos isp. A and B.




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