44 



GEOLOGY OF ERIE COUNTY 



Quaker Road bridge where it forms a cascade across one branch 

 and a rapids across the other. Yet the shales for twenty feet 

 above contain huge concretions, though they are gray. 



The Rhinestreet is exposed along the lake shore southward 

 from Sturgeon Point as far as Dibble Bay, where the layer of 

 concretions marking the top of the formation crops out at water 

 level. Its lower beds and its contact with the Cashaqua are to be 

 seen in Pike creek east of the road. 



The whole formation can best be seen in the gorge of 

 Eighteen Mile creek. The lowest layers appear first at the top 

 of the cliff below the railway bridges. The contact with the 

 underlying Cashaqua is well shown at several points above and 



F. Houghton, Photo. 



Fig. 19. Fault in Rhinestreet shale, below Erie Railway bridge, south 

 branch of Eighteen Mile creek. 



below the old mill and bridge a mile above the railways. From 

 this point the cliffs and bed of the stream are cut in this 

 formation, the harder black layers causing rapids in the stream. 

 The banks for much of its course are sheer cliffs. At a point 

 three miles above the railways the stream forks. Above this 

 junction in the gorge of the north branch rows of immense 

 concretions appear at intervals in the cliff, and at several points 

 the stream bed is cumbered with them. The surfaces of layers 

 exposed in the stream bed exhibit numerous plant remains. At 

 the old McKee's mill a layer of large concretions crosses the 

 stream and forms a fall. 



