Results 181 to 190 of about 1,840 (219)
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The oldest heliolitids from the early Katian of the East Baltic region
GFF, 2012The earliest heliolitids appeared more or less simultaneously in the Late Ordovician shallow seas of different palaeocontinents. In this paper the early Katian heliolitids, represented by the genus Protaraea, are described from the East Baltic region (North Estonia and north-west Russia) and discussed in detail for the first time.
Mari-Ann Mõtus, Yury Zaika
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A Graphic Correlation and Diversity Analysis of the Upper Darriwilian to Lower Katian Graptolites
2017Junxuan Fan
exaly +2 more sources
Late Darriwilian–early Katian (Ordovician) ostracods of northeastern Yunnan, Southwest China
Palaeoworld, 2023exaly +2 more sources
Katian prelude to the Hirnantian (Late Ordovician) mass extinction: a Baltic perspective
Geological Journal, 2011AbstractThe diversity of several groups of Late Ordovician fossils in the Baltic is discussed and corresponding curves are presented. The curves are correlated with the latest δ13C trend and probable sea surface temperatures of the equatorial ocean in order to link biodiversity and environmental changes.
Dimitri Kaljo +5 more
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Late Ordovician (Katian) linguliform microbrachiopods from north‐eastern Yunnan, South China
Papers in Palaeontology, 2021AbstractLinguliform brachiopods are a minor but distinctive component of the Palaeozoic Evolutionary Fauna. However, there is no formal research on Katian (Late Ordovician) linguliform microbrachiopods in South China. Fossils from the ‘Pagoda’, ‘Linhsiang’ and Daduhe formations, Wanhe section of Yunnan Province, South China, provide a unique ...
Di Chen +4 more
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Upper Ordovician (Sandbian–Katian) graptolite and conodont zonation in the Yangtze region, China
Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 2010ABSTRACTThe graptolite and conodont biostratigraphy of the latest Darriwilian, Sandbian and early and middle Katian succession on the Yangtze Platform is reassessed based on numerous new fossil collections and previously published data. At least at some localities, the lowermost Miaopo Formation is of pre-Nemagraptus gracilis Zone age (uppermost ...
Chen Xu +4 more
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2018
Anticosti Island (Gulf of the St. Lawrence, Canada) has some of the most complete, thickest and most richly fossiliferous carbonate successions in the world containing the Ordovician-Silurian boundary. This study focuses on the cyclostratigraphy of the upper Katian Vauréal Formation.
Sinnesael, Matthias +6 more
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Anticosti Island (Gulf of the St. Lawrence, Canada) has some of the most complete, thickest and most richly fossiliferous carbonate successions in the world containing the Ordovician-Silurian boundary. This study focuses on the cyclostratigraphy of the upper Katian Vauréal Formation.
Sinnesael, Matthias +6 more
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Katian oncoids of the lower Ordovician Lianglitage Formation in the Tarim Basin, Northwest China
Carbonates and Evaporites, 2019This study examines oncoids and their diagenetic structures in the lower Ordovician (Katian Stage) Lianglitage Formation in the Tarim Basin, Northwest China. Oncoid morphologies range from spherical and sub-spherical to irregular. Individual oncoids generally range from 4 to 10 mm in diameter, with an average of 8 mm and a maximum of 18 mm.
Shi Pingzhou +3 more
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Revue de Micropaléontologie, 2017
Abstract Investigation of 37 samples from continuously cored intervals of the upper part of the Quwarah Member of the Qasim Formation yielded well-preserved and diverse chitinozoan assemblages. Two biozones previously defined from the North Gondwanan Domain were recognized in the examined cores: the Tanuchitina elongata and Ancyrochitina merga.
Ahmed Al-Shawareb +2 more
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Abstract Investigation of 37 samples from continuously cored intervals of the upper part of the Quwarah Member of the Qasim Formation yielded well-preserved and diverse chitinozoan assemblages. Two biozones previously defined from the North Gondwanan Domain were recognized in the examined cores: the Tanuchitina elongata and Ancyrochitina merga.
Ahmed Al-Shawareb +2 more
openaire +1 more source