Abstract
This paper contains an account of the distribution and characteristics of the blue shale at the base of the Devonian system from Greenfield, Highland County, Ohio, to the Ohio River. Evidence is presented to show that this blue shale belongs to the same formation as the Olentangy shale of central Ohio, that it is local in its occurrence in southern Ohio, and that it rests disconformably on the underlying limestones and lies conformably beneath the Ohio shale, into which it grades in some localities. The field evidence supports the interpretation of Grabau that the Olentangy shale is a basal phase of the Ohio shale and that it is Upper Devonian in age.
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