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A stratigraphic analysis of the Port Jervis formation
Siver, Darby S.
Siver, Darby S.
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Bartholomew, Alexander
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2025-05
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This paper examines the geological characteristics and depositional history of the Port Jervis Formation, located in the Tri-States Region of New York, through a stratigraphic analysis and paleontological perspective. The Port Jervis Formation is an argillaceous limestone defined among the surrounding units by a prominent trilobite bed containing the index fossil Nanothyris subglobosa . Lower Devonian in age, the Port Jervis Formation is between the older Port Ewen Formation and younger than the Glenerie Formation. In other localities in the surrounding region there is an unconformity, the Wallbridge Unconformity, that lies between the Port Ewen and Glenerie formations. The Port Jervis Formation provides a valuable stratigraphic record since it is one of the only preserved units from the period of deposition. The analysis of the Port Jervis Formation aims to cultivate an in-depth understanding of the depositional environment, stratigraphic relationships, and geologic history of the Tri-States Region during this time, which is very sparsely recorded in Earth's history elsewhere. Key Words: Geology; Devonian; stratigraphy; Port Jervis; conodonts; sea level