144 The American Geologist. Marcii, i9oo 
miles N. W. of Rome, 145 feet;* near Utica, 11 miles S. E. of 
Rome, 710 feet ;t and in the Vernon well, about 9 miles S. S. 
W. of Rome, 300 feet. 
The 375 feet of Trenton and 60 feet of Birdseye limestone 
combine to give a thickness of 435 feet for the Trenton forma- 
tion in the Rome well, while apparently it is only 350 feet thick 
in the one at Vernon. In the Globe Woolen mills well at 
Utica 330 feet of dark blue Trenton limestone was reported 
and below this 180 feet of drab to bluish-gray massive lime- 
stone, which was also referred to the Trenton. + 
After studying the Rome well and the numerous outcrops 
of these formations in the Mohawk valley it seems to the 
writer that perhaps the upper 80 feet of this drab limestone, 
from 900 to 980 feet in depth, might be referred to the Birds- 
eye limestone, which would give the Trenton formation a 
thickness of 410 instead of 510 feet. 
The lower 100 feet then being referred to the Calciferous, 
would give that formation a thickness of 420 feet, while in the 
Rome well it is 475. The correlation of the lower part of the 
Globe Woollen mills well is a matter of uncertainty, and after 
the study of the Rome well it seems that all or part of the rock 
referred to the Potsdam with a query may belong in the 
.\rchean gneiss. 
Natural gas was obtained at 665 feet. 15 feet below the top 
of the Trenton and at 860 feet. 210 feet below the top of this 
limestone. The lower horizon was the principal one, where a 
pocket of gas was struck which yielded, according to Mr. J. 
S. Haselton, secretary of the company, between 7 and 8.000,000 
cu. ft. of gas in the first 24 hours. At the end of the first week 
the yield had decreased to 600,000 cu. ft. in 24 hours ; at the 
end of two weeks to 400,000 cu. ft. and in September, 1897, it 
was estimated as about 75,000 cu. ft. Quite large chips of 
Trenton limestone were saved from this horizon, which were 
fossiliferous, six specimens of Orthis(Dalmanella) testudinaria 
Dal, having been found, besides numerous fragments of this 
species. 
*Ibid., p. 107. 
tWalcott, Proc. Amer. Asso. Adv. Science, vol. XXX^'1, 1888, p. 212. 
JPc().sserj_Bull. Geol. Soc. Amer., vol. 4, ]). 100. 
