The American Geologist, Vol. XXXIV. 
Plate XVIII. 
No. 3. Cliff on Rocky fork showing the entire Berea formation, 
capped by Sunbury shale. Photographed by Mr. J. E. Hyde. 
No. 4. Wright quarry west of Portsmouth in which the even bedded 
sandstones of the Buena Vista member are finely shown. Its top is in- 
dicated by Mr. Wilkinson, above which are shown the shale and sand- 
stone zones. 
