| PALAEONTOLOGIA POLONICA VOL. 58 | ||
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Proceedings of the Sixth European |
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Rasmussen, J.A. 1998. A reinterpretation of the conodont Atlantic Realm in the late Early Ordovician (early Llanvirn). In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 67-77. Abstract: Two major Ordovician faunal realms have usually been distinguished around the Iapetus Ocean. The Midcontinent Realm included Laurentia and Siberia, whereas the (North) Atlantic Realm included Baltoscandia and the easternmost part of Laurentia (the Appalachians and western Newfoundland). This study is based on published and unpublished data from the basal Llanvirn (L. variabilis-E. suecicus zones in Baltica and H. holodentata-P. harrisi zones in Laurentia). Cluster analyses demonstrate that the relatively close similarity between Baltica and eastern Laurentia was mainly due to the coexistence of pandemic, deeper-water taxa of the Protopanderodus-Periodon Biofacies. Therefore, it is suggested that the Atlantic Realm was restricted to the areas south-east of the Iapetus, while Laurentia, including its easternmost parts, belonged to the Midcontinent Realm. The contemporary pandemic faunas of the Protopanderodus-Periodon Biofacies were not restricted to a specific realm, but occurred in the Iapetus as well as in the neighbouring platform-margin areas. Key words: Conodonta, paleobiogeography, cluster analysis, biofacies, Early Llanvirn, Early Ordovician, Iapetus Ocean, Laurentia, Baltica, Atlantic Realm. Jan Audun Rasmussen [jar@geus.DK], Geological Survey of Denmark and Greenland, Dept. of Stratigraphy, Thoravej 8, DK-2400 Copenhagen NV, Denmark. |
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Dubinina, S.V. 1998. Conodonts from the Early Ordovician (mid-Arenig) deep water deposits of Central Asian paleobasins. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologica Polonica 58, 79-86. Abstract: Conodont associations from deep water mid-Arenig deposits (Prioniodus elegans-Oepikodus evae zones) of Central Asian paleobasins are summarized. Deep water conodont communities living apparently below the permanent thermocline had the same composition in similar deep water paleoenvironments in different types of basins in Central Asia. They are similar to the Acado-Baltic communities, but differ from the latter by lower taxonomic diversity and, very often, by numerical domination of some species. Juanognathus, typical of the transitional faunal realm, as well as warm-water Midcontinent faunal components, are absent from all Central Asian deep water communities, which are composed exclusively of Acado-Baltic cold-water fauna and thus are related to the cold-water realm. Key words: Conodonta, paleobasins, Early Ordovician, mid-Arenig, Central Asia. Svetlana V. Dubinina [dubinina@ginran.msk.su], Geological Institute, Russian Academy of Sciences, Pyzhevsky per.,7, 109017 Moscow, Russia. |
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Zhang J. 1998. The Ordovician conodont genus Pygodus. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 87-105. Abstract: Two evolutionary branches of Pygodus are recognized and discussed. The new species Pygodus lunnensis and P. protoanserinus are proposed and described in detail. It is suggested that P. anserinus did not evolve directly from P. serra but from P. protoanserinus sp. n. Two new subzones within the Eoplacognthus suecicus Zone are proposed: the Pygodus lunnensis and P. anitae Subzone. Key words: Conodonta, Pygodus, Ordovician. Zhang Jianhua, [jianhua.zhang@geo.su.se], Department of Geology and Geochemistry, Stockholm University, S-106 91 Stockholm, Sweden. |
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Bednarczyk, W.S. 1998. Ordovician conodont biostratigraphy of the Polish part of the Baltic Syneclise. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 107-121. Abstract: Ordovician lithostratigraphic units distinguished in the subsurface of the Polish part of the Baltic syneclise were dated by means of conodonts. The oldest Ordovician deposits, ranging from the (?)upper part of the Cordylodus proavus(?) Zone to the C. angulatus Zone (the top part of the Piaœnica Formation) were penetrated in offshore boreholes. On land, the Ordovician starts with the Drepanoistodus deltifer-Paroistodus proteus zones (the Gardno Formation) (with stratigraphic gap) or with the Oepikodus evae or Baltoniodus navis zones (the Klewno Formation). Because of their lithologic and faunistic similarities, the overlying formations (S³uchowo, Pieszkowo, Sasino) can be correlated with the lithostratigraphic and biostratigraphic units of the southern part of Sweden (Scania and Västergötland) thus indicating a common history of both parts of the sedimentary basin. The Ordovician ends with the Mucronaspis mucronatus trilobite zone. Possible equivalents of the Glyptograptus persculptus Zone have been identified only in one borehole so far. Local stratigraphic gaps within the Kaszuby Formation are a result of the Taconian synorogenesis. They correspond to the Upper Ashgill (Hirnantian), and separate the sandy limestone (the Kokoszki Member) and the claystone (western part) from the nodular limestone (eastern part) of Llandovery age. Key words: Conodonta, lithostratigraphy, biostratigraphy, Ordovician. Wies³aw S. Bednarczyk [wbednarc@twarda.pan.pl], Instytut Nauk Geologicznych PAN, ul. Twarda 51/55, 00-818 Warszawa, Poland, fax 6206223. |
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Ferretti, A. 1998. Late Ordovician conodonts from the Prague Basin, Bohemia. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 123-139. Abstract: A conodont fauna is reported for the first time from the Late Ordovician of Bohemia. Two different levels of the Králùv Dvùr Formation, both well known for their brachiopod and trilobite associations, produced poor and fragmentary conodont material, which nevertheless can be interpreted as Ashgill in age. The material most closely resembles the fauna of southern Europe, but there are also similarities to the Anglo-Baltic conodont associations. A special conodont extraction technique, suitable for argillaceous-calcareous mixed sediments, is described. Key words: Conodonta, Ordovician, Bohemia. Annalisa Ferretti [ferretti@unimo.it] , Department of Earth Sciences, Via Universita 4, 41100 Modena, Italy. |
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Männik, P. and Ma³kowski, K. 1998. Silurian conodonts from the Go³dap core, Poland. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 141-151. Abstract: The conodont faunas from the Silurian interval of the Go³dap core range from the Rhuddanian (Distomodus kentuckyensis Zone) into the middle Ludlow (Polygnathoides siluricus Zone), and probably higher. The D. kentuckyensis, Pranognathus tenuis, Pterospathodus sp. n. E, Pt. celloni and Pt. amorphognathoides zones were recognized in the Llandovery part of the section. The probable position of the boundaries between the Upper Pseudooneotodus bicornis and Lower Pt. pennatus procerus zones, and between the Upper Pt. p. procerus and Lower Kockelella ranuliformis zones were established. Taxa indicating the K. walliseri, and possibly also the K. patula and Ozarkodina sagitta sagitta zones, were found. In the upper part of the sequence, the Pol. siluricus Zone faunas of the early-Late Ludlow age, were determined. Key words: Conodonta, stratigraphy, Silurian, Poland. Peep Männik [mannik@gi.ee], Institute of Geology, Tallinn Technical University, Estonia Avenue 7, EE0001 Tallinn, Estonia. Krzysztof Ma³kowski [malk@twarda.pan.pl], Instytut Paleobiologii PAN, ul. Twarda 51/55, 00-818 Warszawa, Poland. |
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Simpson, A. 1998. Apparatus structure of the latest Silurian to Early Devonian conodont Icriodus woschmidti hesperius Klapper et Murphy, and some comments on phylogeny. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 153-169. Abstract: The apparatus structure of the latest Silurian to Early Devonian conodont Icriodus woschmidti hesperius from sequences in north Queensland, Australia, consists of Pa, Pb and M elements with a symmetry transition series of distinct, but variable, coniform elements. A similar complex of cones was recovered from Ludlow (siluricus Zone) strata; although the apparatus structure is incomplete, the results indicate the existence of a likely ancestral form of the genus Icriodus. The cryptic origin of the genus is discussed in general terms. A distomodontid or icriodellid origin is considered possible. The former is supported by some morphological simmilarities of the symmetry transition series and stratigraphic considerations. The documentation of a Pa element with morphology apparently transitional between Icriodella and Icriodus supports the second possibility. Key words: Conodonta, Icriodus, evolution, taxonomy, Silurian, Devonian, Queensland, Australia. Andrew Simpson [simpson@earthsciences.uq.edu.au], Geology Museum, The University of Queensland, St Lucia, Qld, 4072, Australia. |
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Kozur, H. 1998. The age of the siliciclastic series (Karareis Formation) of the western Karaburun Peninsula, western Turkey. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 171-189. Abstract: Rich faunas of Paleozoic conodonts, radiolarians, ostracods, muellerisphaerids, sponge spicules, ammonoids, bivalves, brachiopods, crinoids, fish remains, and trilobites were found in the predominantly siliciclastic series (Karareis Formation) of the Karaburun Peninsula, western Turkey. These deposits were formerly assigned to the Scythian-Anisian interval. Silurian to Lower Devonian shale-lydite sequences, lydite-rich turbidites, olistostromes with limestone, sandstone and chert olistoliths as well as Upper Devonian to Tournaisian lydite-rich turbidites, olistostromes with lydite and limestone olistoliths were dated by conodonts, radiolarians, and Muellerisphaerida. Limestone inclusions found within keratophyre tuffs were dated as Late Silurian by conodonts, muellerisphaerids, and ostracods. Underlying thick, very lowgrade metamorphic shales, siltstones, greywackes, and quartzites, exposed throughout the northwestern Karaburun Peninsula north of Küçükbahçe, are probably of Ordovician age. So far, these rocks have not yielded any fossils. This unit is herein named as the Küçükbahçe Formation. A transitional sequence from ammonoid- and brachiopod-bearing deep-water shales to the Serpukhovian-Bashkirian shallow-water Alandere Formation contains conodonts, fish remains, foraminifers, ostracods, radiolarians, and sponge spicules of late Viséan age. This sequence is herein named as the Dösemealti Formation. The Scythian-Ladinian rocks do not interfinger with the Paleozoic rocks, but instead represent tectonic slices. All Silurian to early Tournaisian conodonts have Conodont Alteration Index (CAI) of 4-5, whereas the tectonic slices of Scythian to Ladinian rocks within the siliciclastic series contain conodonts with CAIs of 1-1.5. The late Viséan conodonts have CAIs of 2-3. The Late Silurian turbidites and olistostromes and the probable absence of Middle Devonian deposits provide evidence for Caledonian movements in the area. The termination of Paleozoic deep-sea deposition close to the Viséan-Serpukhovian boundary, and the presence of the felsic to intermediate tuffs in the Dösemealti Formation indicate a Hercynian closing of an ocean that separated Gondwana from Eurasia. The oceanic to marginal oceanic Silurian to Lower Carboniferous Karaburun sequence is also present in Chios and continues eastward into the Kütahya-Bolkardag Belt, where until now only an Upper Silurian to Lower Devonian turbidite-olistostrome unit with felsic volcanics was dated. Key words: Conodonta, Silurian, Devonian, Early Carboniferous, Karaburun Peninsula, Turkey. Heinz Kozur, Rézsü u. 83, H-1029 Budapest, Hungary. |
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Key words: Conodonta, correlation, events, Devonian, Lochkovian, Spanish Central Pyrenees, Catalonian Coastal
Ranges, Spain. |
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Mawson, R. 1998. Thoughts on Late Pragian-Emsian polygnathid evolution: documentation and discussion. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 201-211. Abstract: Conodont faunas from Australia and central Asia suggest that the genus Polygnathus stemmed from an eognathodontan lineage rather than an ozarkodinan lineage. It is proposed that narrow forms of Eognathodus sulcatus Philip, 1965 including E. sulcatus kindlei Lane and Ormiston, 1979 gave rise to Polygnathus zeravshanicus (Bardashev et Ziegler, 1992) from which the lineage Polygnathus pireneae-dehiscens-nothoperbonus-inversus-serotinus was derived. A wide form of Eognathodus sulcatus, E. sulcatus secus Philip, 1965 was the praecursor of the Polygnathus trilinearis-hindei lineage, one that failed to give rise to further forms. Key words: conodonts, evolution, Pragian, Emsian, Devonian, Australia, Uzbekistan, Tajikistan. Ruth Mawson [rmawson@laurel.ocs.mq.edu.au], Centre for Ecostratigraphy and Palaeobiology, Earth Sciences, Macquarie University, NSW 2109, Australia. |
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Narkiewicz, K. and Narkiewicz, M. 1998. Conodont evidence for the mid-Givetian Taghanic Event in south-eastern Poland. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 213-223. Abstract: The Pe³cza Member of the Telatyn Formation (Middle Devonian) of Lublin area, SE-Poland, displays sedimentological and biofacies evidence of a distinct transgressive pulse. The conodont fauna of Lublin area, supported by data from western Ukraine, constrains the age of the transgressive event to the Middle Polygnathus varcus Zone. Both biostratigraphic and sedimentological data indicate the occurrence of the worldwide transgressive Taghanic Event recognized herein for the first time in Poland. Conodont biofacies pattern in the studied sections is consistent with current models of Middle Devonian conodont ecology which postulate more open marine and/or deeper-water environments for the Polygnathus-dominated assemblages and more proximal and/or shallow-water settings for the Icriodus-dominated assemblages. Key words: Conodonta, biostratigraphy, paleoecology, Taghanic Event, Middle Devonian, Poland. Katarzyna Narkiewicz and Marek Narkiewicz [mnar@pgi.waw.pl], Polish Geological Institute, Rakowiecka 4, 00-975 Warszawa, Poland. |
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Perri, M.C. and Spalletta, C. 1998. Conodont distribution at the Tournaisian/Visean boundary in the Carnic Alps (Southern Alps, Italy). In: H. Szaniawski (ed.), Proceedings of the Sixth. European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 225-245. Abstract: Nineteen stratigraphic sections of the Lower Carboniferous, goniatite-bearing, pelagic limestone sequence of the Carnic Alps have been measured and sampled for conodonts. The detailed biostratigraphical analysis allows for the recognition of five, late Tournaisian-early Visean biozones from the isosticha-Upper crenulata Zone to the texanus-homopunctatus Zone. The anchoralis-latus and texanus-homopunctatus zones are best represented. Because the species Gnathodus texanus is very rare in the Carnic area, the presence of the texanus-homopunctatus Zone is inferred by the composition of the associated fauna, represented mainly by a few species of gnathodids, vogelgnathids, and very rare polygnathids. In most sections, the occurrence of Pseudognathodus homopunctatus, Lochriea cracoviensis, and Gnathodus praebilineatus is used for the zonal assignement. Scaliognathus anchoralis, and pseudopolygnathids, disappear abruptly below the first occurrences of the above mentioned species. The Tournaisian/Visean boundary, considered as corresponding to the lower limit of the texanus-homopunctatus Zone, was traced in six sections. In all sections the biofacies reflect the pelagic environment also indicated by the lithofacies. Key words: Conodonta, biostratigraphy, biofacies, late Tournaisian, early Visean, Carnic Alps, Italy. Maria Cristina Perri [perri@geomin.unibo.it] and Claudia Spalletta [cspal@geomin.unibo.it], Dipartimento di Scienze della Terra e Geologico Ambientali Universita di Bologna, Via Zamboni 67, I-40126 Bologna, Italy. |
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Rexroad, C., Brown, L., Devera, J., and Suman, R. 1998. Conodont biostratigraphy and paleoecology of the Perth Limestone Member, Staunton Formation (Pennsylvanian) of the Illinois Basin, U.S.A. In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica, 58, 247-259. Abstract: The Perth Limestone Member of the Staunton Formation in the southeastern part of the Illinois Basin consists of argillaceous limestones that are in a facies relationship with shales and sandstones that commonly are calcareous and fossiliferous. The Perth conodonts are dominated by Idiognathodus incurvus. Hindeodus minutus and Neognathodus bothrops each comprises slightly less than 10% of the fauna. The other species are minor constituents. The Perth is assigned to the Neognathodus bothrops-N. bassleri Subzone of the N. bothrops Zone, but we were unable to confirm its assignment to earliest Desmoinesian as opposed to latest Atokan. Conodont biofacies associations of the Perth reflect a shallow near-shore marine environment of generally low to moderate energy, but localized areas are more variable, particularly in regard to salinity. Key words: Conodonta, biozonation, paleoecology, Desmoinesian, Pennsylvanian, Illinois Basin, U.S.A. Carl B. Rexroad [rexroad@pyrite.igs.indiana.edu], Indiana Geological Survey, 611 North Walnut Grove, Bloomington, IN 47405, U.S.A.; Lewis M. Brown, Department of Geology, Lake Superior State University, Sault Ste. Marie, MI 49783 U.S.A.; Joe Devera, Department of Geological Sciences, Southern Illinois University, Carbondale, IL 62901 U.S.A.; Rebecca J. Suman, Department of Geology, Lake Superior State University, Sault Ste. Marie, MI 49783 U.S.A. |
Isakova, T.N. 1998. Review of the conodonts of the Sakmarian stratotype section (South Urals). In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 261-271. Abstract: The analysis of succesive conodont assemblages at the Sakmarian stratotype section has revealed the following succession of conodont zones that can be correlated with the previously defined fusulinid zones: (1) Streptognathodus constrictus Zone corresponding to the Sphaeroschwagerina moelleri-Pseudofusulina fecunda fusulinid Zone; (2) Mesogondolella striata-M. pseudostriata Zone corresponding to Sphaeroschwagerina sphaerica-Pseudofusulina firma fusulinid Zone; (3) M. uralensis Zone corresponding to two fusulinid zones: Pseudofusulina moelleri and Pseudofusulina verneuili; and (4) Mesogondolella bisselli Zone corresponding to the Sterlitamakin regional stage. Key words: Conodonta, Fusulinina, stratotype, Sakmarian, Early Permian, Urals, Russia. Tatyana Nikolaevna Isakova, Geological Institute, Russian Academy of Sciences, Pyzhevsky per., 7, Moscow, 109017, Russia. |
Önder, F., Senel, M., Keskin, A., and Kilic, A.M. 1998. Application of conodonts to Triassic stratigraphy of Teke Taurus (SE Antalya Gulf, Turkey). In: H. Szaniawski (ed.), Proceedings of the Sixth European Conodont Symposium (ECOS VI). - Palaeontologia Polonica 58, 273-279. Abstract: In the Teke Taurus, southern Turkey (SE Antalya Gulf), Triassic formations provide sufficient micropaleontological data for a detailed biostratigraphic analysis. At the base of the succession, the sedimentary rocks are represented by variegated shales, claystones and clayey limestones which were deposited in a shallow marine environment. The overlying part of the sequence is characterized by vermicular and red nodular limestones, rich in marine fauna. These Middle-Upper Triassic limestones, typical for the Alpine-type Triassic, are thought to be consisted of pelagic sediments deposited on sea-mounts within an oceanic basin. The following conodonts have been found in the sequence: Cratognathodus kochi, Cratognathodus sp., Enantiognathus petraeviridis, Enantiognathus sp., Epigondolella abneptis, Epigondolella triangularis, Epigondolella sp., Neogondolella sp., and Neohindeodella sp. Key words: conodonts, Triassic, Antalya, Turkey. F. Önder [onder@cumhuriyet.edu.tr] and A.M. Kilic, University of Cumhuriyet, Department of Geology, 58140 Sivas, Turkey. M. Senel and A. Keskin, Mineral Research and Exploration Institute, Department of Geology, Ankara, Turkey. |
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