316 



GEOLOGY OF OHIO. 



the bed of an old, shallow swamp, now five or six feet above the present 

 channel of the adjacent stream. The stratum is from two to three feet 

 in thickness, but not of sufficient extent to be of any great value. 



GEOLOGICAL STRUCTURE. 



The geological structure of Richland county is easily read, and has 

 little variety. No single exposure discloses all the rocks of the series, 

 and as the dip is often quite considerable, and is without uniformity, the 

 measurements of the different strata are only approximations. 



The section here given is the result of many observations and meas- 

 urements, and will illustrate the general character of the geologica'- 

 structure. 



General SECxioisr of the Rocks of Eichlajsid County. 



Carboniferous Conglomerate. 



^^aiil^sSiBSls?" 



ifi 5ga,|gs"fe-a?ig| 



g?ga£^few!lMi 



wismsmffm^m M 



Argillaoeous and Biliceons shales 170 to S.'iO feet. 



Waverly Conglomerate 100 to 190 feet. 



^^^^^^e^^^=^:=^ee5^= Argillaceous and sandy shales, sometimes bituminous. 



65 feet. 





=o 



Shales, -with bands of flaggy sandstone. 



235 feet. 



Berea sandstone. 



The highest hills in the north-eastern parts of the county are capped 

 with the Carboniferous Conglomerate, which is in general quite thin, 

 rarely attaining a thickness of twenty feet. It frequently contains frag- 



