PROBSER THE GENESEE SECTION. 95 



DEPTH. ^NESS^' FORMATION. 



90' (g.) Upper Helderberg. 



3430' — ^ Place of j Oriskany and 



( Lower Helderberg. 

 Waterlime 



Authority and reference for the thickness of the terranes, as given 

 in the preceding section. 



a. Prof. Henry S. Williams stated that the distance between the 

 little Genesee (Olean) and the Wolf creek (flat pebble) conglom- 

 erates " may average about 300" (Bull. U. S. Geol. Surv., No. 

 41, p. 89). It is probable that Prof. Hall saw both the flat and 

 angular pebble conglomerates, without distinguishing their diff- 

 erent stratigraphical positions. He mentions a conglomerate 

 "about three or four miles south of Wellsville " (4th An. Rept. 

 Fourth Geol. Dist. N. Y., 1840, p. 409) ; again " in Scio it is found 

 on the high grounds near the sources of some small streams flow- 

 ing into the Allegany and Genesee," and finally " in the town of 

 Genesee, about three miles north of the Pa. line, and near the 

 center of that town, the conglomerate, essentially the same as at 



