438 NEW YORK STATE MUSEUM 
the upper layers of the present section are worked in the quarry! 
extending a short distance farther up stream on its western side, for 
sills, a purpose to which they are well adapted by their thickness and 
grain. Many of the layers however are useless for the purpose 
owing to the numbers of fossils which they contain. Rock is ex- 
posed at many points between this place and Rockton where the 
creek has again cut through the entire Trenton stage. At the large 
quarries (Marcellus of Vanuxem?) just below Rockton the lower 
middle layers of the Trenton are worked and the quarry in the 
lowest layers has been abandoned. A section was measured be- 
ginning at the floor of the abandoned quarry. 
45G Section of Rockton quarries 
G°® Extensively worked quarry. Medium thick 
bedded highly fossiliferous crystalline limestone 
nearly continuous with the upper layers of the 
lower quarry. Trenton. 1a’ 20 
G* Compact dark blue medium fine grained 
limestone, containing sparkling crystals of calcite. 
Fairly abundant fossils. Trenton. tan ae, 
G* Medium fine grained dark and medium dark 
blue massive layers of limestone separated by thin 
shaly layers, weathering with ragged surface, 
studded with projecting corals (Streptelasma) 
and crinoid stems. Near the top a fine specimen 
of Columnaria alveolata Goldfuss occurs 
in place. Black river. Of Ae 
G? Slightly coarser than no. I with more of a 
blue tint. Contains crinoid segments. Weathers 
grayish blue with pitted surface. Black river. ae Ne wid 
‘This is no doubt the Thomas J. Donlon quarry mentioned by Prof. J. C. Smock. He 
says, ‘‘On the west side of the stream [Chuctanunda] Thomas J. Donlon quarries 
limestone.on the Vanderveer farm. . .The working face has a length of 500 feet, 
parallel with the creek and is 15 to 20 feet in hight. . .The beds are from two inches 
up to two feet thick, and the bedding surfaces are rather rough and uneven. The stone 
is blue limestone of Trenton epoch. N. Y. state museum bul. 3, Mar, 1888, p. 106. 
*Second annual report third district, Assembly doc. no. 200, p. 283. This quarry 
is also described by Smock as follows: ‘ The quarry of D. C. & N. Hewitt is on the 
left side of the Chuctanunda creek and east of the Rock city road. At the south 
opening which was made many years ago the rock is a dense, blue limestone .. . 
it is the largest and deepest excavation here. The new quarries are about 20 rods 
northward and on the same side of the road.’ A section of the quarry follows which 
foots up from 12 to 16 feet. N. Y. state museum bul. 3, Mar. 1888, p. 106, 107. 
