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AAPG Bulletin

Abstract


Volume: 53 (1969)

Issue: 1. (January)

First Page: 155

Last Page: 162

Title: Correlation of Marine and Nonmarine Strata with Example from Devonian of New York State

Author(s): I. N. McCave (2)

Abstract:

Correlation between marine and nonmarine strata is particularly difficult because of the lack of fossils that span both realms of sedimentation. However, certain changes in the marine realm way produce sedimentologic effects in the nonmarine realm. Such a cause-and effect relation provides a rationale for correlation.

Recent work in New York has shown that two limestones (Tully and Portland Point) are equivalent to transgressive marine clastic tongues which intertongue with contemporaneous nonmarine Catskill redbed sequence.

On the basis of regional structure and thickness trends, it is estimated that nonmarine strata equivalent to these limestone bodies should be found at 1,400- and 900-ft elevations, respectively, in the bed of Kaaterskill Creek at the Catskill front.

The writer suggests that the transgressions caused an increased rate of alluviation on the Catskill alluvial plain and that the equivalent beds in nonmarine sections should be anomalously thick overbank alluvial deposits. Examination of stratigraphic sections in the area of the Catskill front shows the presence of extremely thick (more than 100 ft) overbank alluvium in the position predicted for the Tully, and a thicker-than-normal section (62 ft) at one locality in the position predicted for the Portland Point equivalent. These beds are considered to be correlative with the marine transgressive strata on the west.

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