STRATIGRAPHY OF MOHAWK VALLEY AND SARATOGA CO. 477 



On the eastern side of the creek the Trenton limestone is the 

 lowest rock exposed occurring along its bank both below and 

 above the bridge and below the falls though not on a line with 

 them but at a level from 8 to lo feet lower. Mr Darton reported 

 3 feet of Birdseye sharply separated from the Calciferous sandstone 

 which was the farthest east that he saw this limestone.^ The Tren- 

 ton he reported as 28 feet thick^ " thin bedded members below with 

 heavier bedded and slightly coarser grained beds above " (p. 427). 



Saratoga Springs sections 



Three miles west southwest of Saratoga Springs on ElHs creek 

 at Rowland's mills is the Wing quarry where a considerable ex- 

 cavation has been made in the Trenton limestone. The section of 



this quarry is as follows: 



Feet 



I2E^ Massive thick bedded limestone, some of 

 the layers containing numerous fossils. Trenton 

 limestone. 14=14 



£2 Shaly Trenton limestone. 5=I9 



E^ Boulder clay varying in different parts of the 

 quarry from 7 to 10 feet in thickness. 7=26 



E^ Champlain sand. 3=29 



E5 Soil. 



In the accompanying picture the students are standing on top 

 of the shaly Trenton limestone and back of them is the boulder 

 clay. Darton in his Geology of the Mohawk Valley mentions this 

 quarry when he states that 20 feet of the Trenton formation was 

 exposed at this locality which was called Rowland's Mill (p. 427). 



The stratum which forms the floor of this quarry and is better 

 shown on the eastern side of the highway contains numerous and 

 beautiful specimens of Cryptozoon proliferum Hall. 

 This is the locality described by Prof. Hall when he states that 

 "At a single exposure on the farm of Mr Hoyt, the surface of the 

 limestone is covered by these bodies for many rods in extent "^ 

 and the limestone was referred to the " Calciferous sandstone". 

 Later Mr Walcott referred a considerable thickness of so-called 

 Calciferous in the vicinity of Saratoga Springs to the Potsdam 

 stating that " This limestone was referred to the Calciferous forma- 



113th annual report N. Y. state geologist, p. 423, 427. 



*36tb annual report N. Y. state mus. nat bist. 1883. description ot pL I. 



