40 P. REPORT OF PROGRESS. K. W. CLAYPOLE. 



whole outcrop in Perry county, will be adopted in this re- 

 port as the top of the Clinton group. 



The base of the group remains, as always, at the top of the 

 Medina sandstone. This base T have never seen exposed. 

 so thai it is impossible for me to determine whether there is 

 an abrupt or a gradual transition. 



In Perry county, therefore, the Clinton group, as here de- 

 fined and reduced, shows the following section : 



Fossil iron ore and limestone, 2 feet. 



Sand rook, 5 u 



Fossil ore, 1 " 



Sand rock, 5 " 



( Shale, 160 " 



I Iron sandstone, 2 " 



Upper shale, <j Fossil ore x „ 



{ Shale, 200 " 



Iron sandstone, 10 " 



Hard fossil block ore, 3 " 



Lower shale, 600 " 



Total thickness of Clinton group, 989 " 



The thickness assigned to the different beds is not a con- 

 stant quality, and the diagram does not represent any actual 

 section. The measurements have been taken or estimated 

 where it was possible to obtain them, and the details will 

 be found in the account of the respective townships. Most 

 of them were obtained either at Millersfown or in the west 

 of the county. 



The proportion of lime in the Clinton rocks increases 

 wesl ward, and the iron ore diminishes, and often disappears. 



The only bed of iron ore which I have found in the west 

 of the county in the Clinton group is the sand-vein ore bed,, 

 the bed from which all the ore now mined at Millers town 

 is taken. 



On the other hand, there are several workable beds of 

 lime in Jackson and Toboyne townships which do not exist 

 further east, and which, in the absence of the thicker Lower 

 Eelderberg limestones, are sometimes resorted to by the 

 farmers to obtain lime. 



Comparison with the Clinton of New York. 

 Though data, are somewhat imperfect and much more in- 



