Abstract :Influence of an Early Paleozoic Cratonic Arch on Dolomitization in Upper Ordovician Viola Formation, South-Central Kansas, USA 

AAPG Bulletin ◽  
1997 ◽  
Vol 81 (1997) ◽  
Author(s):  
NEWELL, K. DAVID
Keyword(s):  
Early Paleozoic ◽  
Upper Ordovician ◽  
South Central ◽  
Viola Formation

Biodiversity, systematics, and new taxa of cladid crinoids from the Ordovician Brechin Lagerstätte

2019 ◽  
Vol 94 (2) ◽  
pp. 334-357 ◽  
Author(s):  
David F. Wright ◽  
Selina R. Cole ◽  
William I. Ausich
Keyword(s):  
New Species ◽  
New Taxa ◽  
Large Scale ◽  
Unexpected Result ◽  
Taxonomic Study ◽  
New Genera ◽  
Early Paleozoic ◽  
Upper Ordovician ◽  
Major Lineage ◽  
Lake Simcoe

AbstractUpper Ordovician (Katian) strata of the Lake Simcoe region of Ontario record a spectacularly diverse and abundant echinoderm fauna known as the Brechin Lagerstätte. Despite recognition as the most taxonomically diverse Katian crinoid paleocommunity, the Brechin Lagerstätte has received relatively little taxonomic study since Frank Springer published his classic monograph on the “Kirkfield fauna” in 1911.Using a new collection of exceptionally preserved material, we evaluate all dicyclic inadunate crinoids occurring in the Brechin Lagerstätte, which is predominantly comprised of cladids (Eucladida and Flexibilia). We document 15 species across 11 genera, including descriptions of two new genera and four new species. New taxa include Konieckicrinus brechinensis n. gen. n. sp., K. josephi n. gen. n. sp., Simcoecrinus mahalaki n. gen. n. sp., and Dendrocrinus simcoensis n. sp.Although cladids are not commonly considered major components of the Early Paleozoic Crinoid Macroevolutionary Fauna, which is traditionally conceived as dominated by disparids and diplobathrid camerates, they are the most diverse major lineage of crinoids occurring in the Brechin Lagerstätte. This unexpected result highlights the important roles of specimen-based taxonomy and systematic revisions in the study of large-scale diversity patterns.UUID: http://zoobank.org/09dda7c2-f2c5-4411-93be-3587ab1652ab

Possible Early Paleozoic coral, Intermontane Belt, south-central British Columbia

1980 ◽  
Vol 17 (2) ◽  
pp. 266-268
Author(s):  
Samuel J. Nelson
Keyword(s):  
British Columbia ◽  
Late Paleozoic ◽  
Early Paleozoic ◽  
Organic Structure ◽  
Western Cordillera ◽  
South Central

A possible organic structure resembling a halysitid coral was found in the Chapperon Group of south-central British Columbia, a unit generally considered of Late Paleozoic age. If it is such a coral, then it would be the oldest fossil so far found in the eugeosynclinal rocks of the Canadian Western Cordillera and could imply an Early Paleozoic eugeosyncline.

scholarly journals Agnostid trilobites from the Upper Ordovician of Sweden and Bomholm, Denmark

1989 ◽  
Vol 37 ◽  
pp. 213-226
Author(s):  
Per Ahlberg
Keyword(s):  
British Isles ◽  
Upper Ordovician ◽  
Generic Concept ◽  
South Central

Arthrorhachis tarda (Barrande, 1846) and Sphaeragnostus cingulatus (Olin, 1906) are described from the Upper Ordovician (Harjuan Series) of Sweden and Bornholm, Denmark. S. cingulatus is extremely rare, while A. tarda is generally abundant in middle Ashgillian strata and known from a great number of localities in southern and south-central Scandinavia. Outside Scandinavia, A. tarda is frequently encoun- tered in the pre-Himantian Ashgill of Poland, Bohemia, various parts of the British Isles, and Kazakh­stan. In most of these areas, the species is generally confined to mudstone sequences, and it is usually associated with faunas of Mediterranean type. The generic concept of Sphaeragnostus is revised.

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