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Stratigraphic distribution of brachiopods and bivalves in the upper devonian famennian chagrin shale in the cuyahoga river valley northeast ohio usa



Stratigraphic distribution of brachiopods and bivalves in the upper devonian famennian chagrin shale in the cuyahoga river valley northeast ohio usa



Kirtlandia (45): 7-32



The Upper Devonian Chagrin Shale, exposed in the Cuyahoga River Valley in northeast Ohio, has a relatively rich, brachiopod-dominated fauna. Two stratigraphic sections were sampled to determine the distribution of brachiopods in these shale and siltstone beds. Nineteen brachiopod and four bivalve taxa have been described from the unit in this study. Conodont faunas, and to a lesser extent, brachiopod ranges, provide evidence of a late Famennian age for the Chagrin Shale. The Chagrin sediments were deposited on a relatively shallow shelf, below normal wave base. Sedimentation rates were slow, energy was low, and the substrate was fluid. Turbidity was at least moderate, as evidenced by dominant colonization by brachiopods instead of bivalves. Episodic storms carried sediments westward from the prograding Catskill Delta complex, leading to the periodic burial of brachiopod communities. The low degree of fragmentation and lack of abrasion of specimens suggest rapid burial rates. Preservation was influenced by the processes of dissolution, pyritization, and phosphatization.

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Accession: 007822532

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