222 



The most palpable objection to this view is the fact that no noncon- 

 formity exists between the Knobstone and the Harrodsburg limestone 

 at their contact a few miles west of the strip. Another objection is 

 that the bottom of the channel, at present at least, is not all of uniform 

 elevation throughout its length. The principal objections to the view 

 of a double fault are two — at no point was a direct vertical contact 

 of Knobstone and limestone visible, nor was there to be seen any of 

 the tilting, crushing and shattering which usually accompanies faulting. 

 On the other hand, as the vicinity of the contact line is approached 

 the shaly layers of the limestone become more and more argillaceous 

 and apparently pass over into the Knobstone. To determine the exact 

 conditions under which the limestone strip was laid down would re- 

 quire more extended study than is consistent with the scope of this 

 report. What has been done was to ti-ace upon the accompanying maps 

 the outcrop of the Bedford oolitic and to examine the bed more care- 

 fully at places where it is now being quarried, namely at Heltonville 

 and Fort Ritner." 



In the proceedings of the Academy of Science of Indiana for 1897, 

 page 262, J. A. Price discusses the boundary of the limestone strip and 

 says in conclusion : "It is not possible, from data in hand, to say 

 surely whether this strip of limestone owes its existence to an uncon- 

 formity or a fault." 



In 1903 J. F. Newsom published a description of a "Geologic Section 

 Across Southern Indiana" as a part of the 26th Annual Report of the 

 State Geologist. On pages 274 and 275 Newsom refers to the structure 

 as a fault in the Knobstone area. He gives its extent as being from 

 near Unionville in Monroe County to a point in the northern part of 

 Washington County. 



In referring to the discussions of Siebenthal and Price in the 

 27th Annual Report of the State Geologist, 1903, on page 90, Ashley 

 says: "It is evident that if the limestone strip north of White River 

 is due to a fault its effects should continue to the south rather than 

 turn and follow the outcrop. A glance at the map in the region north 

 of Campbellsburg is alone sufficient proof of the fault character of the 

 disturbance." 



In studying this structure in detail the writer has found that it is 

 much more extensive than Newsom stated; that there is a second fault; 



