132 
The Americafi Geologist. 
March, 1900 
of the thickness of the Lower Silurian formations in central 
Xew York and will supplement the writer's earlier papers on 
this subject.* 
In the description of the sections we will begin at the east 
and proceed toward the west, and in this order the first well 
for consideration will be the one £t Ilion, which was drilled 
by the Remington Standard Typewriter Co. in their factory 
yard, its mouth being only a short distance from the bank of 
the Erie canal. I am indebted to the company, especially Mr. 
B. B. Van Deusen for samples from this well. 
SECTION OF THE ILION WELL. 
(Mouth of well aj)proxiinately 405 feet A. T.) 
NO. OF 
SAMPLE 
DEPTH 
IN FEET 
195 
260 
325 
475 
580 
DESCRIPTION OF SAMPLE 
A magnesian limestone mixed 
with calcareous sandstone 
and chips of a black shale 
which were probably from 
loose blocks and not from 
bed-rock. 
Black shale with brownish 
streak, quite strong efferves- 
cence in cold HCl. 
Browner streak and coarser 
chips. 
Blacker, finer chips and 
more calcareous. 
Fine chips, light to dark gray 
in color, which effervesces 
very strongly in cold HCl. 
Light gray to drab sample, 
containing grains of iron py- 
rites. Effervesces very 
strongly in cold HCl, and 
when that ceases, efferves- 
ces strongly on heating. 
Some clay-like residue with 
a little sand. 
FORMATION 
Drift 
Utica shale 
Utica shale 
Utica shale 
Trenton lime- 
stone 
Birdseye lime- 
stone. 
*In Petroleum and Natural Gas in New York State. (Trans. Am. 
Inst. Min. Engineers, vol. XVI, 1888, p. 940.) 
The Thickness of the Devonian and Silurian Rocks of western cen- 
tral New York, (American Geologist, vol. VI, 1890, p. 199.) 
The Thickness of the Devonian and Silurian Rocks of central New 
York. (Bull. Geol. Soc. America, vol. 4, 1893, p. 91.) 
