478 NEW YORK STATE MUSEUM 
tion originally; the great Stromatopora-like bodies of Hoyt’s 
quarry, four miles west of Saratoga, occurring in it.”"1 The reasons 
for this correlation were given more fully by Mr Walcott at a 
later date.” 
On the Geologic map of New York the line of division between 
the Potsdam and Calciferous at this locality is represented as fol- 
lowing the highway with Calciferous on the western side. It was 
found, however, that from the foot of the bank on the eastern side 
of the road for 45 feet to a ledge seen on the western side of the 
road the rocks contain specimens of Lingulepis acumi- 
nata Con. associated with fragments of Potsdam trilobites. The 
old Hoyt quarry is in the midst of this 45 feet and gives the fol- 
lowing section: 
12D! Massive impure limestone in lower part of oo 
quarry containing specimens of Lingulepis 
acuminata Con. and trilobites. 1010 
D? Not well exposed. 212 
D* Massive rock in layers, the upper part containing 
Lingulepis and trilobites. | | 44—164 
The Cryptozoon stratum is light gray, strongly calcareous” 
and contains large numbers of this fossil; some of them were elon- 
gate, others somewhat circular and one by the side of the road had a 
diameter of 2 feet, 2 inches. This stratum is exposed by the side 
of the road just north of the three corners a short distance north 
of the Hoyt quarry and then is finely shown for some distance in 
the field to the northeast. The layer immediately below the 
Cryptozoo6on one in this field contains specimens of trilobites 
and other fossils. . 
In the southern part of Greenfield township not more than 4 
mile northeast of the three corners north of the Hoyt quarry and 
24 miles northwest of Saratoga Springs are three cuts along the 
Adirondack railroad in the Potsdam sandstone. The most eastern 
one (12C), where the east and west highway crosses the railroad, 
shows a massive stratum of white quartzose sandstone varying 
from I foot, 9 inches to 2 feet in thickness. There are also shaly 
layers in which are fucoidal markings. . 
Science, 1884, 3:137. 
7U. S. geological survey, bul. 30, 1886, p. 21, 22, and ibid. bul. 81, p. 346. 
