BUFFALO SOCIETY OF NATURAI, SCIENCES 



53 



The line of contact of the Hanover shale with the overlying 

 Dunkirk shale is well shown at the mouth of Big Indian creek 

 which joins Cattaraugus creek in Cattaraugus county below 

 Iroquois. No line can be drawn between the Hanover and the 

 underlying Angola. 



The Hanover shale forms sheer cliffs along L,ake Erie from 

 Silver Creek nearly to Dunkirk. Fine exposures are to be seen 

 in the valley of Walnut creek from Silver Creek to the bridge 



F. Houghton, Photo. 



Fig. 27. Sandstone ledge in lower Hanover or upper Angola shale, West 

 Falls, Cazenovia creek. 



south of Hanover Centre. The contact of the Hanover with 

 the overlying Dunkirk shale is seen at the mouth of Big Indian 

 creek. At North Collins it is exposed in two gullies east of the 

 state road. In the south branch of Eighteen Mile creek it is 

 well shown. The formation begins east of the state road at 

 Eden Valley and forms the bed and sides of the stream to a point 

 half a mile north of Clarksburg. The lower of the two thick, 

 black beds included in the Hanover, forms a high cascade at 



