1892.] PROSSER THE GENESEE SECTION. 53 



Catskill, No. IX — Red and gray shale and sandstone 250' 

 TGray shale and sandstone 350' ] 



Upper Chemung, ; Red and gray shale and sandstone [^ 1^00' CM 



No. VIII. ; Mansfield red beds 300' f 



I Gray shale and sandstone 650' J 



Middle Chemung — Bradford oil sandstone 45' 



Lower Chemung, No. VIII — Grayshaleand sandstone 645' + 



In 1 887 Ashburner first published his correlation of the Richburgh 

 oil and gas sand of Allegany Co., N. Y., with that of the Bradford. 

 He said : "According to Mr. Carll this sand [the oil-sand of Allegany 

 district] lies about 150 feet below the Clarendon Third sand. From 

 my own examinations, made in both the Allegany and Bradford oil 

 districts and across the intervening country, I was disposed to regard 

 this sand as identical with the Bradford, which lies between 300 and 

 400 feet below the Clarendon Third sand." (") In 1888 this opinion is 

 stated positively, as follows : " The geological horizon of the Alle- 

 gany oil and gas-sand which is commonly and locally known as the 

 Richburgh is the same as that of the main producing oil and gas- 

 sands of the Bradford region, known by the oil-well drillers as the 

 Bradford third sand." (■') Also, " It may be accepted as beyond 

 question that the productive oil and gas-sands in the vicinity of Rich- 

 burgh, Bolivar, AUentown, the Waugh and Porter well and at Brad- 

 ford are geologically the same, although they differ much in their 

 physical characteristics." {*) 



Mr. John F. Carll, who has carefully studied the conglomerates 

 of southwestern New York and northwestern Pennsylvania, mentioned 

 in 1887 an outlier of the Olean conglomerate "near the center of Gen- 

 esee township, Allegany County, [N. Y.]" at an altitude of "about 

 800' above little Genesee creek and 2350' above ocean." (") In this 

 report Mr. Carll gave a generalized section for 800' of the rocks below 



(i.) Ibid., -p. T^. " The average thickness of this member may be stated at 1300 feet. At 

 Bradford it is 1281 feet." 



(2.) Trans. Am. Inst. Min. Eng., vol. xv, p. 519. 



(3.) Ibid., vol. xvi, p. Q27. 



(4.) Ibid., p. 929. On pp. 928 and 929 the data upon which this correlation is based are given. 

 Briefly, it is that the Olean Conglomerate is identified in southern Allegany Co. The Cranston well 

 No. I, in Genesee township, shows that the Richburgh oil and gas sand is 1729 feet below the bottom 

 of the Olean conglomerate, while at Bradford it is 1770 feet. Other wells in the Allegany district do 

 not differ to any considerable extent in the thickness of the rocks between the Olean conglomerate 

 and the Richburgh sand. In 1883 Mr. Carll published the statement that from the base of the Olean 

 conglomerate to the top of the Richburgh sand was i6oo' (2d Geol. Surv. Penn., I4, p. 165.) 



(5.) Ann. Rept. Geol. Surv. Penn. for 1S86. Pt. II, Oil and Gas Region, p. 636. 



