530 CHARLES S. PROSSER 



capping the hills in the vicinity of Garland, Warren county, Pa. 

 (p. 45). I cannot say positively that the names " Olean " and 

 " Garland conglomerate " made their initial appearance in geo- 

 logical literature in the above-quoted instances. In 1875, how- 

 ever, under the direction of Mr. Carll, a spirit-level line was run 

 across northwestern Pennsylvania " for the purpose of connect- 

 edly tracing the several outcrops of Gmdayid conglomerate , that 

 they might thus be identified with cotemporaneous rocks in the 

 state of New York on the one side and in the state of Ohio on 

 the other." ^ As a result of this work, Mr. Carll stated that the 

 Garland conglomerate " is apparently identical with the Olean 

 conglomerate in McKean county ; with the Sharon conglomerate 

 in Mercer county; [and] with the Ohio cojiglomerate in Ohio,"^ 

 and the chapter is headed " The Garland (Olean or Sharon) 

 Conglomerate. "3 In Carll's succeeding report he abandoned 

 the use of " Garland conglomerate " in favor of " Olean con- 

 glomerate," and in explanation said : 



In Report I, I ^, 1 3, I have used the term Garland conglomerate. It is now- 

 demonstrated that my Garland conglomerate is the Olean conglomerate of Mr. 

 Ashburner's report on McKean county, and I shall therefore use the latter 

 term in this report .'' 



Professor H. S. Williams apparently considered the " Sharon con- 

 glomerate " in the Cuyahoga and Painesville sections as equiva- 

 lent to the " Olean conglomerate," for in those sections it is 

 lettered H, and in the paper is the statement that " H is the 

 conglomerate (Olean and equivalent). "s 



Finally, on the Geologic Map of New York, by Frederick J. H. 

 Merrill, published in 1901 [1902], the "Olean conglomerate" 

 appears as the name of this Carboniferous formation in south- 

 western New York. Regarding the identity of these two 

 conglomerates, Dr. J. M. Clarke has written me as follows : 



I have recently come into possession of an elaborate compilation of all the 

 well sections in the region of McDonald, Pennsylvania, prepare;d by Mr. F. 



' Idid., 13, 1880, p. II. ^Ibid., p. II. 



""Ibid., p. 13. ^Ibid., 1 4, 1883, p. 185, footnote. 



^Proc. A. A. A. S., Vol. XXXIV (1886), p. 225 ; and see "Meridional Sections 

 of the Upper Devonian Deposits of New York, Pennsylvania, and Ohio." 



