56 ROCHESTER ACADEMY OF SCIENCE. [Jan. II, 



Carll places the top of the Chemung 570' below the base of the Olean 

 conglomerate, Ashburner 502' and Williams 330', Professor Williams 

 identified specimens of Spirifera disjuttcta Sow., Pakcanatitm typa 

 Hall, and other fossils from the horizon which he considers the 

 equivalent of the flat pebble conglomerate, (') and this evidence is 

 regarded by the writer as of greater value than that upon which 

 Carll and Ashburner divided the section. 



In support of this opinion is the additional fact that Professor 

 Hall has referred the conglomerate at Portville, Cattaraugus Co., 

 N. v., to the Chemung group C') and this conglomerate was positively 

 identified by Professor Williams as equivalent to the Wolf creek flat 

 pebble conglomerate. (') 



Records of the Wells. 



The first well record to be considered is that of well No. 91 of 

 the United Natural Gas Co., which is located on the Hatch farm, lot 

 No. 2, in the southeastern part of Clarksville township, Allegany Co., 

 two miles northwest of Richburgh and nearly two and one half 

 miles southeast of West Clarksville. It was drilled during the early 

 part of 1888 by Mr. H. W. Hatch of Richburgh, N. Y., to whose 

 kindness I am indebted for a set of samples and from whom I have 

 received other samples and information of much value in this investi- 

 gation. No oil was obtained, but gas in sufficient amount to raise a 

 pressure of 100 lbs. in about twenty minutes. September 15th, 1890, 

 Mr. Hatch wrote me that he should estimate the daily production of 

 the well as approximately 400,000 cu ft. of natural gas. 



By the aneroid barometer Mr. Cilbert D. Harris, of the U. S. 

 Geological Survey, determined the altitude of the mouth of the well 

 to be 625' above the R. R. station at Richburgh. According to Mr. 

 Frank M, Baker, Agent for Receiver of the Bradford, Eldred and Cuba 



(i.) J6id., p. loi. 



(2.) Geol. Surv. N. V, Paleontology, Vol. V, pt. I, Lamellibranchiata II, 1885, under the 

 description of three species of Falceanatina on pages 488-490. 



In connection with the above see what Professor Hall wrote in 1867 about the Allegany Co. con- 

 glomerates : "In the collections of the geological survey these fossiliferous conglomerates were 

 arranged as a part of the Chemung group, while the coarser non-fossiliferous rocks of similar character 

 in Allegany and Cattaraugus counties were considered as outliers of the Carboniferous conglomerate. 

 We have since learned, however, that the conglomerate of the southwestern counties of the State is 

 a constituent member of the Chemung group. 'l"he red slialy and arenaceous strata, sometimes 

 observed beneath the conglomerate, are merely subordinate beds of little significance and in no way 

 related to the red rocks of the Catskill group to which they have sometimes been referred." (Ibid., 

 Vol. IV, pt. I. note following preface.) 



(3.) Bull. U. S. Geol. Surv., No. 41, p. 90, where Prof. Williams wrote : " The fossils found at its 

 lop [the Portville conglomerate] and the relations of the rock to those below and above leave no 

 doubt of its identity with the Wolf creek conglomerate four miles to the north." 



