The Geology of Cincinnati. 57 
quarry beds, fifty feet thick; the middle or Eden shales, 250 
feet thick; and the Hill quarry beds, 150 feet thick. 
This division was criticised by Mr. S. A. Miller,* who could 
not see that the Point Pleasant beds were any different from 
Cincinnati beds, though probably somewhat lower, and that 
the divisions of the Cincinnati beds proper were useless, and 
with no facts to warrant any such division. The committee 
of the Cincinnati Society of Natural History on nomencla- 
ture** reported that the Trenton is not exposed at Cincinnati, 
nor at any point west of the city, ‘“‘but we think it may be 
represented in the banks of the Ohio River a few miles east 
of the city.” 
Thus the age of the Point Pleasant beds proved a matter 
of dispute. Mr. W. M. Linney,t of the Kentucky Geological 
Survey, thought the Trenton included ‘doubtless, the build- 
ing stones quarried at Point Pleasant, on the Ohio River 
above Cincinnati.’’ In a paper on the correlation of the 
Lower Silurian horizons, Mr. EK. O. Ulricht} seems to have re. 
garded the Point Pleasant beds as of the same age as the strata 
outcropping in the river bank in West Covington, which he 
includes in his ‘‘ Beds XI;” earlier in the same paper{ these 
beds are referred to ‘“‘ Beds X”’ which are exposed at Lexing- 
ton, Kentucky. Throughout this paper, which was left 
unfinished, the author studiously avoids indicating the age of 
the various beds, no doubt intending to give this in the later 
discussion. 
In Volume VI of the Reports of the Ohio Geological Survey, 
dealing mainly with petroleum and natural gas, and the 
geological facts brought to light by the drill, the Point Plea- 
sant beds are recognized for the first time by the survey as 
Trenton.§ The equivalent strata|| at Cincinnati were con- 
sidered to be 300 feet below the surface. How sucha dip in 
twenty odd miles is made to agree with the almost horizontal 
* Cincinnati Enquirer, August 7, 1873. 
*** Jour. Cin. Soc. Nat. Hist., I, 1879, pp. 193-4; 
+ Notes on the Rocks of Central Kentucky. Geol. Surv. Kentucky, J. R. Proctor, 
Director, 1882, p. 6. 
+7 Amer. Geologist, I, 1888, p. 307. 
t Ibid., p. 18r. 
¢Geol. Surv. Ohio, VI, 1888, p. 5. 
|| Ibid., p. 6. 
