22 R. S. Bassler — Deep Well at Waverly, Ohio. 



This section presents no new facts regarding the rocks 

 younger than the Trenton, for between Waverly and Cincin- 

 nati, about 80 miles west, the same strata have been studied 

 along numerous surface outcrops. The earlier Mohawkian 

 formations are not exposed until central Kentucky, over 100 

 miles distant, is reached, while the Saint Peter sandstone and 

 Canadian limestone are not known at all by surface outcrops 

 in the Ohio valley. 



The section of strata penetrated by a deep well at Oxford, 

 Ohio, is of interest in this connection. A detailed description 

 of the log of this well was given by Joseph F. James in vol- 

 ume X of the Journal of the Cincinnati Society of Natural 

 History, but for present purposes only the general section 

 determined by him is of interest. Arranged in the same form 

 as the one given above, this section, with the formations as 

 identified by James, but with the correlations of the present 

 day inserted in brackets by the present writer, is as follows : 



Geologic Section, Deep Well at Oxford, Ohio. 



Thickness 

 in feet. 

 Cincinnati group: 



Blue limestone and shale [Richmond and Maysville].. 360 



Blue shale [Maysville and Eden] 380 



Dark limestone [Trenton] 50 



Trenton group: 



White limestone with magnesia [Lowville and Stones 



River] . 495 



Calciferous sandrock: 



White, arenaceous limestone [Saint Peter] 40 



Unfortunately this well did not go deep enough to show the 

 strata underlying the Saint Peter sandstone, nor did certain 

 deep wells bored at Cincinnati pass beyond this formation. 

 These Cincinnati wells showed the same stratigraphy and essen- 

 tially the same thickness as in the Oxford well, so that the 

 latter can be taken as typical for the region of the Cincinnati 

 axis. Comparing the Oxford and Waverly sections, the follow- 

 ing conclusions may be drawn : 



(1) From observations on both sides of the Cincinnati axis, 

 the Maysville and Richmond divisions of the Cincinnatian do 

 not vary enough in thickness to suggest marked decrease of 

 deposition across the apex of the axis. The Utica is seldom 

 more than a few feet thick at Cincinnati. In northern Ohio 

 it has become greatly thickened, as shown in the gas wells ; it 

 has likewise attained a considerable thickness in the Appala- 

 chians. The increased thickness of the Cincinnatian as a whole 



