Ordovician K-bentonites of eastern North America by Dennis R. Kolata

By Dennis R. Kolata

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40; locality 62) (Haynes, 1992). Haynes suggested that the Deicke ash was deposited in the region of the eastern belt but because of reworking or removal by erosion, the ash was not preserved as a separate, discrete bed of bentonitic material in the Bays Formation. Northern Virginia and eastern West Virginia In northern Virginia, from Botetourt County northward to south-central Pennsylvania, Ordovician rocks containing K-bentonite beds are exposed in the Valley and Ridge province at intermittent outcrops in the Shenandoah Valley and in the western anticlines of Virginia and West Virginia (Fig.

The following discussion focuses first on the stratigraphic succession west of the thrust faults and then on the sections within the thrust sheets. Ordovician K-bentonite beds were described by Fox and Grant (1944) from Tennessee and adjacent states. The primary emphasis of their report was on southeastern Tennessee in the vicinity of Chickamauga Dam near Chattanooga, Tennessee, where fourteen beds ranging in age from Whiterockian to Cincinnatian were exposed during construction of the dam. Fox and Grant correlated K-bentonites in this region to beds in central and eastern Tennessee, northeast Alabama, and southwestern Virginia.

Ordovician K-bentonite beds were described by Fox and Grant (1944) from Tennessee and adjacent states. The primary emphasis of their report was on southeastern Tennessee in the vicinity of Chickamauga Dam near Chattanooga, Tennessee, where fourteen beds ranging in age from Whiterockian to Cincinnatian were exposed during construction of the dam. Fox and Grant correlated K-bentonites in this region to beds in central and eastern Tennessee, northeast Alabama, and southwestern Virginia. The oldest bed, their B-1 (“B” for bentonite), is as much as 90 cm thick and is present near the base of the Murfreesboro Limestone in eastern Tennessee.

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