REVIEW OF DATA USED. 100 



well began in the upper part of this formation and passed through 950 

 feet before reaching the Niagara limestone* 



As near as can be determined, the Niagara limestone has a thickness 

 of 52 feet in the Chittenango well, while in the State well near Syracuse 

 it is 332 feet thick ; in the Gale well, 320 feet, and in the Clyde well, 335 

 feet.f However, it is often very difficult to decide on the dividing line 

 between the lower gray marls aim limestones of the Onondaga Salt group 

 and the beginning of the Niagara limestone; hence there is some doubt 

 as to the accuracy of the thickness of this formation. 



The Clinton group has a thickness of 323 feet in the Chittenango well ; 

 in the State well 98 feet, and the Gale well of 149 feet. There is appar- 

 ently too. great a difference in the thickness of this formation as given in 

 the State and Gale wells when their proximity is considered, but the 

 samples as labeled seem to furnish the above result. The Clinton is 

 approximately 83 feet in thickness in the Clyde well, and in the Seneca 

 Falls well the Niagara and Clinton groups have a thickness of 400 feet.'! 



The Medina is 508 feet thick in the Chittenango well and 807 feet in the 

 State well. The Gale well penetrated the Medina 583 feet ; in the Clyde 

 well it is 942 feet thick, and in the Wolcott well 690 feet. 1 1 The Oswego 

 sandstone is 107 feet thick in the Chittenango well ; 185 feet in the Fulton, 

 and in the Wolcott 210 feet. The Clyde well stopped after passing through 

 92 feet § of it and the State well penetrated it to a depth of 150 feet. 



The Lorraine shale of the Hudson group isG40 feet in thickness in the 

 ( '1 littenango well and 695 feet in the Fulton well. The Sandy Creek well 

 began in the Lorraine, passing through 400 feet before reaching the Utica 

 shale. In the Wolcott well there is 820 feet of shales and sandstone 

 which may be referred to the Lorraine and the Utica shale.^[ 



The Utica shale which forms the surface rock at Utica was shown by 

 the Globe Woolen Mills well to have a thickness of at least 570 feet in 

 that city. Mr Walcott reported its total thickness to be 710 feet in the 

 Campbell well, three miles west of Utica.** This shale is 233 feet thick 

 in the Chittenango well ; 120 feet in the Fulton, and 145 feet at Sandy 

 creek. The Trenton limestone in the Utica well has apparently a thick- 

 ness of 510 feet, but on account of the great difficulty in deciding upon 

 what shall be considered the top of the Calciferous this statement must 

 be accepted as partly an estimate. Mr Walcott in a similar manner con- 

 cluded that the Trenton had a thickness of about 430 feet in the Camp- 

 bell well.ff The Chittenango well penetrated this formation to a depth 

 of 637 feet, and in the same way the Sandy Creek well passed through 



* II. id., pp. 202-203. r [bid., p. 204. t Ibid-, l'l>- 203, 204. 



|| Ibid.', p. 204. g Ibid., p. 204. fl Ibid., p. 204, 



**Proc. Am. Assoc. Adv. Soi., vol. xxxvi, p. 212, tt Ibid., p. 212. 



