794 GEOLOGY OF OHIO. 
guide to future work in this general field. The following diagram in- 
dicates the location of most of the test borings: 
The surface elevations are referred to a base line, 47 feet below 
grade of Cleveland, Akron and Columbus Railroad, at junction 2 miles 
west of Warwick. 
Track at shaft, 67 feet above base line. Coal at shaft, 455 feet 
(approximately) above Lake Erie, or at about the same elevation as 
coal in Chippewa mine. 
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