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The AAPG/Datapages Combined Publications Database
CSPG Special Publications
Abstract
Biostratigraphy
Age and Correlation of the Tully and Cedar Valley Formations in the United States
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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