^ix'^c- of llic I'l. I'Uasiuit Ih-ds. 99 



Group is one huiulred and twenlN-four feet, and the lUica shale 

 one hundred and thirty-five feet thick at Cincinnati, l^elow 

 which conies tlie Trenton limestone. This statement is based 

 ui)on the record of a well bored at Cincinnati. Now, the 

 mouth of this well was only about seventy feet above low 

 water in the Ohio River; of this .seventy feet, forty-eight were 

 drift materials, leavini^ twenty-two feet of rock down to low 

 water. Deducting this from the thickness assigned to the Hud- 

 son River Rocks we find it extending one hundred feet below 

 low water in the Ohio; and if to this we add the one hundred 

 and thirty-five feet assigned to the Utica Shale, we have two 

 hundred and thirty-five feet of rock below low water in the 

 Ohio, at Cincinnati, before the Trenton limestone is touched. 

 How, then, is it possible upon this evidence to a.ssign the beds 

 at Point Pleasant, only fifty feet lower than the lowest rocks 

 at Cincinnati, to the Trenton terrane? In a second well, it is 

 estimated that the Trenton w^as reached at a depth of about 

 two hundred and fifty feet below low water in the Ohio River. 



In the same year, iSSS, Mr. Iv O. Ulrich, in an article en- 

 titled " A Correlation of the Lower vSilurian Horizons of Tenn- 

 essee, and of the Ohio and Mississippi Valleys, with those of 

 New York and Canada,'"'^ mentions the Point Pleasant Beds 

 and assigns them to the lower p^rt of the Cincinnati rocks. 

 On another page of the article,!' he correlates the beds with 

 rocks occurring at Lexington, Kentucky. 



In 1889 Prof. Orton, in the course of a paper on " The Tren- 

 ton Limestone as a Source of Petroleum and Natural Gas in 

 Ohio and Indiana,"]! again refers to the Point Pleasant Beds 

 as of Trenton age. He says this reference was made in 1873 by 

 some geologists, among them Mr. S. A. Miller, citing the 

 Journal of the Cincinnati Society of Natural His- 

 tory. This date is an obvious error for 1879, because the 

 first volume of the Journal was not issued until 1878-1879, 

 and in January, 1S79, the report of the committee already al- 

 luded to was published. No special description of the strata 

 is given, but mention is made of the composition of the lime- 

 stone, and it is compared with the Trenton of other localities. || 



■••■American Geologi.st, vol. i, 1.SS8, page 307. 



tibid, page iSi. 



tEighth .^lui. Kept. U. S. Geol. Sur., part 2, ifsSg. page 546. 



llUjid, pages 550-552- 



