Williams.] CLAYPOLE. 131 



estuary Oatskill sediments has been going on simultaneously with the 

 open sea deposits of the Waverly formation." 1 



The true objection to such terms as " Chemuug-Catskill" and " Cats- 

 kill Pocono » did not come to light in this controversy. The uames do 

 not misrepresent the facts they were intended to represent, i. e., that 

 in Pennsylvania there are formations which by their fossils indicate not 

 only transition, but a blending of two distinct formations of New York 

 but it may be urged that these names do not clearly express the facts. 

 The truth is that sedimentation did not change synchronously for even 

 very limited areas, and to attempt by the use of nomenclature to make 

 the division lines of the chronological scale precisely coincide for the 

 sections of adjoining States will often unnaturally strain the facts. 



In 1885 Eeport of Progress F 2 was published. 2 In this report the 

 classification adopted in Mr. White's Report G 1 was more fully elabo- 

 rated. Mr. Claypole's classification is as follows: 



No. XI. Mauch Chunk red shale. 



No. X. Pocono sandstone. 



No. IX. Catskill formation, including — 



Upper beds. 



Dellville sandstone. 



King's Mill shales. 



King's Mill sandstone. 



Fish beds. 

 No. VIII (/). Chemung group. 

 No. VIII (e). Portage group. 

 No. VIII (d). Genesee group. 

 No. VIII (c). Hamilton groiq), including — 



Hamilton Upper shale, 200 to 300 feet. 



Hamilton (Montebello) sandstone, 500 to 800 feet. 



Hamilton Lower shale, 400 to 500 feet. 

 No. VIII (b). Marcellus limestone and black shale, including 



Marcellus black shale, 100 feet. 



Marcellus upper iron ore, 2 feet. 



Marcellus limestone, 50 feet. 



Marcellus lime shales, 50 feet. 



Marcellus lower iron ore, 2 feet. 

 No. VIII (a). Upper Helderberg (Corniferous) group. (Absent.) 

 No. VII. Oriskany sandstone group. 



The division line between the Chemung group and the Oatskill is not 

 clear. Occasional red beds occur below the line he sets, and Chemung 

 fossils occur above the "Fish beds," which he regards as the base of 

 the Catskill. 3 



In 1885 Williams read a paper on the classification of the Upper De- 

 vonian. 4 



1 On tho intimate relations of the Chemung group and the Waverly sandstone in north western Penn- 

 sylvania and southwestern New York, by James Hall, Proc. Am. Assoc. Adv. Sci., vol. 33, p. 418. 



2 Second Geol. Survey of Pennsylvania, Report of Progress F 2 . A preliminary Report on the Palaeon- 

 tology of Perry County, describing the order and thickness of its formations and its folded and 

 faulted tructnre, by E. W. Claypole. Harrisburg, 1885. 



3 Ibid., pp. 72,73. 



4 On the classification of the Upper Devonian, by Henry Shaler Williams, Am. Ass. Adv. Sci. Proc, 

 vol. 34, 1885, pp. 222-234. 



