In a recent article Martin and Henniger (1969) described and named two sandstone units of Pennsylvanian and Permian ages in Ohio, Pennsylvania, and West Virginia. One of these sandstone bodies, the “Hockingport Sandstone Lentil,” is named for its distribution near the town of that name in Athens County, Ohio. The other unit is named the “Mather Sandstone Lentil” for the town of Mather, Greene County, Pennsylvania. Martin and Henniger thought both sandstones to be in the lower part of the Dunkard Group and partly equivalent to the lower member of the Waynesburg Formation, although they were uncertain of the exact...

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