Results 181 to 190 of about 1,800 (206)

Bryozoan fauna of the Upper Ordovician (Katian) of Alnif, Morocco

Palaeobiodiversity and Palaeoenvironments, 2015
Bryozoan fauna was discovered within the glaciogenic sediments of an Ordovician (Hirnantian) tunnel valley infill near Alnif, Morocco where it had been redeposited from the upper Tiouririne Formation (Ktaoa Group, Katian). This fauna contains four species—one esthonioporine, two trepostomes and one rhabdomesine cryptostome—of which three are new ...
Andrej Ernst, Andrea Jiménez-Sánchez, Lahssen Baidder   +2 more
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Late Ordovician (Katian) chitinozoans from northwest Saudi Arabia: Biostratigraphic and paleoenvironmental implications

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, Merrell Miller, Marco Vecoli   +2 more
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Katian prelude to the Hirnantian (Late Ordovician) mass extinction: a Baltic perspective

Geological Journal, 2011
AbstractThe 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, Linda Hints, Olle Hints, Peep Männik, Tõnu Martma, Jaak Nõlvak   +5 more
openaire   +1 more source

The oldest heliolitids from the early Katian of the East Baltic region

GFF, 2012
The 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
openaire   +1 more source

GIANTS AMONG MICROMORPHS: WERE CINCINNATIAN (ORDOVICIAN, KATIAN) SMALL SHELLY PHOSPHATIC FAUNAS DWARFED?

PALAIOS, 2016
Abstract Small fossils are preserved as phosphatic (carbonate fluorapatite) micro-steinkerns (~ 0.5 mm diameter) in Upper Ordovician beds of the Cincinnati area. Mollusks are common, along with bryozoan zooecia, echinoderm ossicles, and other taxa. Similar occurrences of Ordovician micromorphic mollusks have been interpreted as ecologically dwarfed and
BENJAMIN F. DATTILO, REBECCA L. FREEMAN, WINFRIED S. PETERS, WILLIAM P. HEIMBROCK, BRADLEY DELINE, ANTHONY J. MARTIN, JACK W. KALLMEYER, JESSIE REEDER, ANNE ARGAST   +8 more
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Katian (Late Ordovician) conodonts on the northwestern margin of the North China Craton

Journal of Paleontology, 2021
AbstractUpper Ordovician strata exposed from the Baiyanhuashan section is the most representative Late Ordovician unit in the northwestern margin of the North China Craton (NCC). In total, 1,215 conodont specimens were obtained from 24 samples through the Wulanhudong and Baiyanhuashan formations at the Baiyanhuashan section.
Zhihua Yang, Xiuchun Jing, Hongrui Zhou, Xunlian Wang, Hui Ren, Yang Shen, Ru Fan   +6 more
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Late Katian Paraorthograptus pacificus Graptolite Biozone from Xing'an, northern Guangxi, China

GFF, 2014
Based on the study of recently collected graptolites from the Huang'ai – Shengping – Tianlingkou section of Xing'an, northern Guangxi, China, the Paraorthograptus pacificus Biozone (upper Katian, Upper Ordovician) was first recognized in the upper part of the Tianlingkou Formation in this region. The P.
Lan Tang, Xu Chen
openaire   +1 more source

Global palaeobiogeography of brachiopod faunas during the early Katian (Late Ordovician) greenhouse episode

Palaeogeography, Palaeoclimatology, Palaeoecology, 2013
The early Katian (Late Ordovician) was marked by a major greenhouse episode and the early stage of a first-order marine transgression that led to the flooding of much of North America during the middle–late Katian. Multivariate analyses of 33 brachiopod faunas of early Katian (Trentonian, Chatfieldian, late Caradoc) age, including 252 rhynchonelliform ...
Akbar Sohrabi, Jisuo Jin
openaire   +1 more source

Katian (Ordovician) radiolarians from the Malongulli Formation, New South Wales, Australia, a reexamination

Journal of Paleontology, 2009
Upper Ordovician radiolarians are described from limestone within the Malongulli Formation in the Cliefden Caves area using revised systematics. Eight genera and 12 species are described, including the following four new species:Protoceratoikiscum crossingi, Haplotaeniatum ovatum, Haplotaeniatum prolatum, andBorisella dunhilli, and two new combinations,
Paula J. Noble, Barry D. Webby
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Upper Katian Cyclostratigraphy of the Vauréal Formation, Anticosti Island (Gulf of St. Lawrence, Canada)

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, Mauviel, Alain, Desrochers, André, McLaughlin, Patrick, De Weirdt, Julie, Claeys, Philippe, Vandenbroucke, Thijs   +6 more
openaire   +3 more sources