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The AAPG/Datapages Combined Publications Database
CSPG Special Publications
Abstract
Stratigraphy of Special Areas
Upper Devonian Stratigraphy and Palaeontology of Southwestern New York State
Abstract
Upper Devonian rocks of southwestern New York State (Erie, Chautauqua and Cattaraugus Counties) are represented by over 2800 feet of nearly horizontal strata. Included are all units from the base of the Geneseo Shale to the top of the Oswayo Formation. Rocks of Late Devonian age are placed in three groups, (in ascending order) the Seneca, Arkwright, and Conewango. The Seneca Group contains about 635 feet of marine strata, mostly gray to black shales. The black shales are rich in fish and conodonts whereas the gray shales contain a predominance of molluscs. Of the variety of lithologies included in the 1500 feet of Arkwright rocks, gray shale is most common. Other rock types are black shale near the base of the group and increasing percentages of gray siltstone in the upper portion of the Arkwright. The black shales contain conodonts, the gray shales exhibit a molluscan fauna, while the siltstones have abundant brachiopods, bryozoans, and crinoid columnals. The youngest Devonian Group is the Conewango, represented by about 700 feet of interbedded marine and non-marine units. Distinctive conglomerates, buff sandstones, and redbeds interflnger with marine gray shales and siltstones. Brachiopods, molluscs, bryozoans, and crinoid columnals are associated with the marine rocks, but the redbeds are nearly barren.
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