Copeland, M.J. (1977). Early Paleozoic Ostracoda from southwestern district of Mackenzie and Yukon Territory, Canada. Geological Survey of Canada. Commission Géologique du Canada. Bulletin. 275:1-88.

205567

Copeland, M.J.

1977

275:1-88

Publication

https://emrlibrary.gov.yk.ca/gsc/bulletins/275.pdf

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Early Paleozoic strata of the Cordilleran elastic and carbonate belts are widely distributed throughout northwestern North America. They contain varied, silicified late Ordovician, Late Silurian and Early Devonian ostracode faunas that may serve as a basis for correlation in southwestern District of Mackenzie, central Yukon Territory and eastern Alaska. Three Middle Ordovician, Whiterockian to Trentonian ostracode assemblages have been previously reported from southwestern District of Mackenzie in strata of the carbonate belt. These are equated to the North American Orthidiella-"Goniotelina", Mimella and Hesperorthis-Oepikina biostratigraphic assemblages. A fourth assemblage, of Late Ordovician Maysvillian age and equated to the Cryptolithus-Anataphrus fauna, is described here from the Road River elastic belt. It contains six taxa of which one is new. These assemblages may be correlated with others from Oklahoma, Virginia and midcontinental North America and demonstrate a late Ordovician North American transgressive faunal sequence. Ostracode assemblages of Late Silurian and Early Devonian age are present in both elastic and carbonate belts throughout the region. The earlier, cosmopolitan Wenlockian-Pridolian assemblages are of common occurrence locally, especially in the elastic belt, and display a beyrichiacean-bairdiacean fauna of Eurasian aspect. The later, more provincial Siegenian-Emsian assemblage of relict beyrichiaceans and ancestral hollinaceans, may be equated, in general, with the Monograptus yukonensis Zone. This assemblage marked a late phase of Early Paleozoic elastic deposition in the Cordilleran area and established a hollinid fauna that, during the Middle Devonian, flourished in midcontinental North America. More than 90 ostracode genera are known from these Siluro-Devonian strata; of these, 116 taxa are recorded here, including 2 new genera and 37 new species.

America, North

Systematics, Taxonomy

Ostracoda

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