Abstract
Introduction
In northeastern Ohio the Ohio black shale of early reports was divided by Dr. Newberry into the Huron, Erie, and Cleveland shales,2 of which the Erie was later renamed the Chagrin by Professor Prosser,3 the entire succession up to the Berea thus becoming :
in which the type Huron may be largely contemporaneous with the Chagrin4 and only partly identical with the “Huron” beneath the Chagrin, in the well logs. More recently these strata of northeastern Ohio have been most carefully described by Prosser,5 whose work furnishes the foundation for the present writing.Berea grit
Bedford shale
Cleveland black shale
Chagrin formation
Huron black shale
In northwestern Pennsylvania Dr. I. C. White described the following succession in Erie and Crawford counties, adjacent to Ohio and western New York :6
Corry sandstone
Cussewago shale
Cussewago sandstone
Riceville shale
Venango group
Chemung beds
Girard shale
Portage beds
Oil Lake group
The relations . . .
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