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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Intl. Symposium of the Devonian system: Papers, Volume II, 1967
Pages 701-709
Biostratigraphy

Age and Correlation of the Tully and Cedar Valley Formations in the United States

G. Arthur Cooper

Abstract

The stratigraphic position and faunas of the Tully and Cedar Valley Formations are reviewed and the conclusion reached that they are contemporaneous and belong in the late Middle Devonian. The preponderance of faunal evidence indicates a Middle Devonian age despite the presence of an ammonite hitherto thought to be restricted to the Upper Devonian (Frasnian Iα). The Tully is correlated with beds in Kentucky, Michigan, Wisconsin, and Manitoba by virtue of its relationship to the Cedar Valley.


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