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The AAPG/Datapages Combined Publications Database
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Abstract
Smith Jr., Langhorne B.,
DOI:10.1306/13331534M983521
2012 by The American Association of Petroleum Geologists.
Great American Carbonate Bank Subsurface Stratigraphy in the Northern Appalachian Basin, New York State
Langhorne B. Smith Jr.1
1New York State Museum, Albany, New York, U.S.A.
ABSTRACT
The great American carbonate bank stratigraphy in the subsurface of New York state includes the Cambrian–Ordovician Sauk megasequence carbonates that have a significant component of interbedded siliciclastics, particularly in the western part of the state. The Sauk megasequence onlaps the Precambrian basement on what was an east–west-trending high across Lake Ontario to the Adirondacks and is capped by the regional Knox unconformity. The unconformity overlies Lower Ordovician strata in the eastern part of the basin and progressively older strata to the west-northwest. The Sauk megasequence carbonates and siliciclastics all appear to be cyclic shallow-marine deposits. Siliciclastics were sourced from the Precambrian basement exposed to the north and west. During and perhaps just before the period when the Knox unconformity formed, an uplift existed along a northeast–southwest-trending unnamed arch that trends roughly parallel to Lake Erie in western New York that caused greater erosion to occur in the northwestern part of the state and progressively less in the southeastern part of the basin.
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