43^ ' 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. 



45 G 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. io'=24' 



G* Compact dark blue medium fine grained 

 limestone^ containing sparkling crystals of calcite. 

 Fairly abundant fossils. Trenton. 3'=i4'4" 



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 

 ofColumnaria alveolata Goldfuss occurs 

 in place. Black river. 6'=ii'4" 



G^ Slightly coarser than no. i with more of a 

 blue tint. Contains crinoid segments. Weathers 

 grayish blue with pitted surface. Black river. i' 4''=5' 4'' 



^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. 



