Skip to Main Content

ABSTRACT

The Upper Devonian Foreknobs Formation is a series of sandstones and siltstones that outcrops in the central Appalachian Basin from Pennsylvania south into Virginia and West Virginia. The Foreknobs Formation is generally regarded as the delta slope portion of the Catskill clastic wedge (= Catskill delta) occurring between the dark marine lithologies of the underlying Brallier and Scherr Formations and the younger fluvial red beds and conglomerates of the overlying Hampshire Formation. Progradational and retrogradational pulses of the clastic wedge are recorded in the alternating siltstones and sandstones before grading into nonmarine lithologies at its top. Well-preserved fossils are very abundant within the Foreknobs Formation. They have aided in locating the Frasnian-Famennian Stage boundary and have provided important information regarding its namesake extinction event. The progradation of the clastic wedge during Foreknobs Formation deposition allowed for both shallow- and deep-water environments to exist up to and across the Frasnian-Famennian boundary, which may have contributed to some uncertainty in correlating the lithostratigraphic position of the boundary with the biostratigraphic signature of the extinction event.

You do not currently have access to this chapter.

Figures & Tables

Contents

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal