During recent subsurface stratigraphic work in West Virginia a thin bed of meta-bentonite has come to be recognized at the contact of the Huntersville chert (Onondaga age) with the base of the overlying Marcellus black shale. The top of the Huntersville is normally either cherty limestone or calcareous chert. In the northeastern part of West Virginia it is in most places shaly limestone or calcareous shale.

Because of the nature of the collection of well cuttings, the exact thickness of this bentonitic layer is not known. Ordinarily it constitutes a small percentage of the sediments in a sample. The average...

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