STATK GEOLOGIST. 73 



The- at Knniskillen, I Q#fc rind aeighboi 



ditics in Canada, become the source of large quantities of 

 petroleum; and there is tittle doubt that the mineral <>il of Ohio 

 is dern ed fi I and fthe 



f less bituminous shales Ijing above ti tin 



Le or animal matter, th<- tource ol the 

 ! oils. This oil is eliminated by i il >w Bpontai fil- 



iation, and rises up and saturates the overlying porous Band- 

 8t«»i. in which, in Ohio and Pennsylvania, it is found by 



• 

 ii in Micl The oil beai .. 



Bnniskillen, are but an elbow of a formation which 1 • 



boundary line. The nil 



bales unquestionably dip under ».i . 



tar from the - throughout St. Clair, Oakland, Macomb, 



lac and Huron counties But are they overlain by a 



porous aandf ipable of bee - utory of the 



products of the Bpontane lation of the oil, or are they 



overlain by argillaceous strata which would prove completely 



snperri ke ascent ile matters? In the present 



state of our knowledge this question cannot be satisfactorily 



d, but the indications are 1. rather favorable. 



B that at sv voral points in St. Clair 



bitumin ions < x i s t , and streams 



of inflammable g vped from the earth; moreover, an 



ov<_ i to be everywhere an esi 



tiai D to til-.- accumolatioB of oil. In the present state 



of the case there Beams to be sufficient encouragemeni 

 d • cautious scale. 

 : the black bituminous shales beneath the I •• 

 m ThundV i Kettle Point, must | 



mil Point tux Barques. It follows, tl 



: along the shor( 

 ;id dipping a-west, must be n 



• ■ ' Hi of Ohio,' 



from i raJ R«port for 1&5». 



10 



