Ml >|-.l'.U 



New York county ' 



of while crystalline limestone 



of t Silurian le of the Harlem river, at 



I south of Ki ; several exposures also occur in Morri- 



r points in the county. 

 Th- 366 of the white limestone from Kings- 



indly furnished by Mr G. A. Stone: 



7.15 10.2 



]•'(•• id and alumina 1.06 3.33 



. 39.57 27.32 



Itagneaia 10.02 17.09 



r2 



Niagara county 1 



Limestone passes through the towns of Eoyalton, Lock- 

 port, Cambria and Lewiston. In this county the Guelph, or 

 magnesian member, is missing, but the lower member is of in- 

 creased thickness. The lower beds overlying the shale are apt 

 to be somewhat silieious, but the upper ones are a crinoidal 

 II ii of greater purity. 



The following section of beds composing the Xiagara limestone 

 at J. given by Prof. Hall. 3 



Thinly laminated, blackish gray limestone with thin laminae 



of bituminous shaly matter, the whole exhibiting a tendency to 



a c ionary or contorted structure and the surface of the 



marked by small knobs. 



4 Grayish brown bituminous limestone, the lower part with 



pillar cavities containing spar. 

 3 A dark colored limestone with cavities and veins of spar 



ry. 

 2 [rregularly thick bedded limestone of a light gray color, also 

 containing cavities lined with spar. 



Manhattan island, (see Trans. N. Y. acad. kL 



Merrill, F. .7. II. Crystalline rocks of southeastern New York, (see 



1898. 1: 2-31) 

 W. W. iat. V Y. 1843. 



1th dist. V 'i . p. 110) 

 — ' A. W. Guide to tl gy and paleontology of Niagara 



i Bui. !."-. X. y. Btate mus. 1001) 

 . V. p. so. 



