About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 68 (1984)

Issue: 12. (December)

First Page: 1921

Last Page: 1921

Title: Subsurface Geology of Medina Group (Lower Silurian) and Clinton Group (Lower to Upper Silurian) of New York: ABSTRACT

Author(s): Matthew W. Kearney


The depositional Previous HitenvironmentsNext Hit and geologic history of the Medina Group (Lower Silurian) and the Clinton Group (Lower to Upper Silurian) of New York have been interpreted from a regional subsurface study using approximately 250 gamma-ray logs and 125 sample logs. A sequence of paleogeographic maps illustrate the geologic history and depositional Previous HitenvironmentsNext Hit associated with this predominantly clastic, rock sequence.

Seven principal depositional Previous HitenvironmentsNext Hit are recognized on the basis of subsurface sedimentary facies. These Previous HitenvironmentsNext Hit are: (1) transgressive clastic shoreline, (2) stationary clastic shoreline, (3) progradational clastic shoreline, (4) shallow marine nearshore to Previous HitdeltaicNext Hit, (5) transgressive shallow marine clastic shelf, (6) transgressive shallow marine carbonate shelf, (7) progradational shallow marine clastic-carbonate shelf. Subenvironments recognized within the stationary clastic shoreline include beach, bay, barrier, and open-marine.

The Silurian clastic rocks were deposited during an overall marine transgression that was interrupted by three major progradational phases. The orogenic episodes represented by these progradational phases steadily decreased in intensity. The sediment influx during the first progradational phase was large enough to produce a Previous HitdeltaicNext Hit system that extended throughout New York. During the second progradational phase, the sediment influx was small relative to the first event, and subsidence probably increased from loading of the Grimsby sediments. The Previous HitdeltaicTop system that developed during this time was restricted to east-central New York. The final progradational phase represents an even smaller influx of terrigenous material; only a linear clastic shoreline developed in eastern New York. Th s phase marks the last major influx of terrigenous clastic sediments until Devonian time.

End_of_Article - Last_Page 1921------------

Copyright 1997 American Association of Petroleum Geologists