1892.] PROSSER THE GENESEE SECTION. 57 



R. R. Co., the elevation of Richburgh is 1675' A. T., (') which would 

 make the altitude of the mouth of the well 2300' A. T. (") 



The top of the Wolf creek conglomerate west of West Clarks- 

 ville is stated by Professor Williams to be not over 2,000' A. T., (^) 

 and the rate of dip for Allegany Co. is 25' per mile. {*) 



This well is two miles -)- farther south than the outcrop of the 

 Wolf creek conglomerate, so that the position of this conglomerate 

 in the well may be called about 1950' A. T., and the mouth of the 

 well is 350' higher than the Wolf creek conglomerate. (') 



According to Professor Williams the average distance between 

 the two conglomerates is 300'. (") Then the mouth of well No. 91 

 would be geologically at least near the top of the red and green 

 shales between the ist and 2d conglomerates and not far from the 

 horizon of the Little Genesee or Olean conglomerate. 



Record of Well No. 91, or the United Natural Gas Co. of 

 Clarksville, Allegany Co., New York. 



The depth of the well is 1441', from it eighty-four samples of 

 drillings were received, and since this is probably the best set of 

 specimens from any well in the Richburgh region a concise descrip- 

 tion of each sample will be given. 



NO. OF description OF THICKNESS 



sample, depth. sample. of STRATA. 



1. 19'. Cireenish, argillaceous shale with frag- 



ments of fossil plants. An occasional 

 brownish-red chip. Non-calcareous. 



2. 38'. Mainl}' light green, soft argillaceous 58' of 



shale. Two large chips of reddish, greenish 

 somewhat arenaceous shale. shale. 



(i.) Mr. Baker also gives the elevation of Bolivar, New V'ork, as ... 1625' A. T. 



Little Genesee, New York, as - 1585' " 



West Clarksville, New York, as - 1697' " 



all of which stations are not mentioned in the 2d edition of Gannett's " Dictionary of Altitudes in the 

 U. S." Bull. U. S. Geol. Surv., No. 76. 1891. 



(2.) The above elevation of the well is somewhat more than Mr. Hatch's determination. At 

 first Mr. Hatch reported it as about 575' above the R. R. station at Bolivar, which would make the 

 elevation about 2200' A. T.; but in a subsequent letter, January 24th iSgr, he called the altitude 

 2225'. Mr. Harris states that " 520' of the height has actually been leveled, and I can vouch for the 

 other hundred." (Letter, October qth. 1891.) 



(3.) Bull. U. S. Geol. Surv., No. 41, p. 86. 



(4.) Ibid.^ p. 103. 



(5.) Mr. Harris wrote Oct. 23 : " Conglomerate fragments are by no means rare over the 

 whole Richburgh area ; but I noticed particularly fossiliferous conglomerate fragments between the 

 altitudes 25o'-35o' below the top of well No. 91. In fact, I saw no fossils in place above these alti- 

 tudes in any of the rocks. No red beds were seen, the rocks as exposed along the roads were light- 

 colored, mainly bluish-greenish and generally not thick bedded and arenaceous, but shaly. This 

 applies only to beds exposed along the highway from altitudes 2oo'-4oo' below the mouth of No. 91." 



(6.) Ibid., p. 89. 



