To one of the nestors of American geology, the immortal William B. Rogers, we owe the first description of the Kanawha black flint of West Virginia. In his “Fourth Annual Report of Progress” of the Geological Survey of Virginia for the year 1839 he gives such a full and minute description of this remarkable stratum that little has been added by any subsequent observer. He did not define its exact place in the stratigraphic column, but by making it the dividing line between what he called his “Upper and Lower Coal Series,” there can be very little doubt that he correctly divined its proper horizon.
Unique in physical aspect, easily discerned, and almost constantly present in the section, it constitutes a most valuable key rock in the greatly thickened deposits of the region. Hence with proper care on . . .