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Ripple marks as indicators of Late Ordovician sedimentary environments in Northwest Estonia
ripple marks Upper Ordovician Estonia
2009/10/21
Late Ordovician sedimentary environments promoting the development of ripple marks in shallow shelf carbonate deposits of northern Estonia are analysed. Ripple marks are described using different para...
The regional stratotype section and point for the base of the Hirnantian Stage(the uppermost Ordovician) at Mirny Creek,Omulev Mountains,Northeast Russia
Hirnantian regional stratotype graptolites brachiopods NE Russia
2009/10/21
A complete Hirnantian sequence comprising the Normalograptus extraordinarius and N. persculptus biozones is well developed at the Mirny Creek section in the Omulev Mountains. The underlying beds are a...
Discovery of the Ordovician Kinnekulle K-bentonite at the Põõsaspea cliff,NW Estonia
Kinnekulle K-bentonite metabentonite Ordovician Keila Stage Baltoscandia
2009/10/21
A previously unknown outcrop of the Kinnekulle K-bentonite (metabentonite) is reported from the Põõsaspea cliff, NW Estonia. The bed has a sharp lower and a gradational upper contact and...
Kaljoprion-a new enigmatic jawed polychaete genus from the Upper Ordovician of Estonia
scolecodonts jawed polychaetes taxonomy convergent evolution Late Ordovician
2009/10/21
A new Late Ordovician polychaete genus Kaljoprion, with K. laevaensis gen. et sp. nov. as the type species, is described from the Nabala Regional Stage of the Laeva-18 drill core, central Estonia. The...
Ordovician sponges (Porifera) and other silicifications from Baltica in Neogene and Pleistocene fluvial deposits of the Netherlands and northern Germany
Baltica Eridanos River erratics Ordovician Porifera silicifications
2009/10/21
Fluvial deposits of Miocene to Early Pleistocene age in Germany and the Netherlands were laid down in the delta of the Eridanos River System, but the exact provenance of this material continues to be ...
Distribution of the order Proetida (Trilobita) in Baltoscandian Ordovician strata
Ordovician Baltoscandia geschiebe Trilobita Proetida distribution
2009/10/21
The trilobite order Proetida forms a minor but important faunal element within the Ordovician strata of Baltoscandia.This review follows the current systematic, taxonomic, and stratigraphical usage an...
Advances in the Ordovician graptolite biostratigraphy of the St Petersburg area,Russia
Ordovician graptolites biostratigraphy St Petersburg area
2009/10/21
The Ordovician shallow-water shelf deposits rich in benthic fauna are exposed along the Russian part of the Baltic– Ladoga Klint. Graptolites occur only at some stratigraphic levels, being compar...
Mid-Ordovician (Late Darriwilian) Conodonts from the Southern-Central Taurides, Turkey: Geological Implications
middle-Ordovician palaeogeography Taurides Turkey stratigraphy Conodonts
2009/7/8
The Tekmen Member of the Seydişehir Formation of the Silifke-Aydıncık Nappe is exposed between the towns Silifke and Aydıncık, in the central Taurides, southern Turkey. The me...
专著信息
书名
Late Ordovician articulate brachiopods from the Red River and Stony Mountain formations, southern Manitoba
语种
英文
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作者
Jin Jisuo,Zhan Ren-bin
第一作者单位
出版社
2001年由NRC Research Press（加拿大）出版,全...
A conodont biozonation for the Middle Cambrian through Lowermost Ordovician in Hunan, South China
2007/7/28
期刊信息
篇名
A conodont biozonation for the Middle Cambrian through Lowermost Ordovician in Hunan, South China
语种
英文
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作者
Dong Xiping,John E. Repetski and Bergstrom,S. M
第一作者单位
Department of Geology...
期刊信息
篇名
Conodont as useful guide fossil in the Cambrian: A conodont zonal succession from the Middle Cambrian to the Lowermost Ordovician in Hunan, China
语种
英文
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Dong X.-p,Bergstrom,S.M. & R...
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The ontogeny of the Ordovician trilobite Ovalocephalus and its bearing on the affinity and evolution of the genus
语种
英文
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作者
Yuan Wenwei,Zhou Zhiyi,D. J. Siveter,Zhou Zhiqiang
第一作者单位
刊物...
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篇名
Magnetostratigraphic Constraints on the Gondwanan Origin of North China: Cambrian/Ordovician boundary results
语种
英文
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作者
Yang,Z.,Sun,Z.,Otofuji. Y.,B. Huang
第一作者单位
刊物名称
Geophysical Jour...
Asymmetric Zonation of a Thick Ordovician K-Bentonite Bed at Kinnekulle, Sweden
Bentonite Diagenesis Illite/smectite Potassium Shale X-ray powder diffraction
2012/1/9
The clay fraction of a …2-m-thick K-bentonite at Kinnekulle in southwestern Sweden has been studied by X-ray powder diffraction, chemical analyses, and cation-exchange capacity determinations. Previou...
Chemical Characteristics and Origin of Ordovician K-Bentonites along the Cincinnati Arch
Bentonite Chemical composition Illite/smectite Interstratification K-bentonite Rectorite
2012/2/8
K-bentonites of the Middle Ordovician High Bridge Group along the Cincinnati arch are characterized by interstratified illite/smectite (I/S) clays with rectorite-type ordering. Approximately 20% of th...