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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Devonian of the World: Proceedings of the 2nd International Symposium on the Devonian System — Memoir 14, Volume III: Paleontology, Paleoecology and Biostratigraphy, 1988
Pages 541-558
Paleoecology and Biostratigraphy

Miospores, Zonation and Correlation of Upper Devonian Sequences from Western New York State and Pennsylvania

J. B. Richardson, S. Ahmed

Abstract

Western New York State and northern Pennsylvania forms a classic area for North American Devonian stratigraphy. A reconnaissance of some Upper Devonian deposits (uppermost Frasnian to Strunian) has revealed abundant and diverse palynomorphs: prasinophycean cysts, acritarchs, chitinozoans, scolecodonts, miospores and megaspores. The miospores are varied and increase in abundance upwards through an increasingly 1 egressive sequence. The material investigated forms an almost continuously exposed sequence from the upper West Falls through the Canadaway, Conneaut and Conewango Groups and into the overlying Knapp Formation. Several distinct palynofacies are recognised in sediments, indicating open sea (“deep” basin) to slope, shelf and alluvial environments. Key miospores are described and used to delimit four assemblage zones and eleven subzones (assemblage, interval and concurrent subzones). A correlation is proposed between the North American sequences and the type Famennian and Strunian of western Europe which extends that previously proposed (Richardson and McGregor 1986). This correlation reveals discrepancies, with the small amount of conodont evidence available.


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