294 GEOLOGICAL EXCURSION TO THE ROCK* MOUNTAINS. 



The gas from this, and other adjaciMii and altogether similar fields in 

 Ohio and Indiana, is transported bypipe lines to Toledo, Tiffin, San- 

 dusky, Detroit, Fort Wayne, Indianapolis and scenes of smaller towns, 



Sealevel 



Sea Jevehr 



Hi.'. 9. 



Settle vel 



Fig. 10. 

 Sections across tbe ofl field of Northwestern Ohio. (I', s. G. Survey. 8th Ann, Rep., p. 604.) 



7. Ohio shale. 



o. Upper Beldexberg limestone. 



f>. Lower Belderberg limestone (Lndlow). 



. $ Niagara fSP?!* 01 "* 



I Clinton limestone fWenlook). 



il nilsun River shale. 



Medina shale, 

 2. CTtioa shale, 

 l. Trenton limestone (Bala). 



where it is used on a very large scale for manufacturing purposes and 

 especially for domestic fuel. It is sold to the consumer for the latter 



