MUSEUM OF COMPARATIVE ZOOLOGY. 



313 



and limestones of the corniferous period ; then the Marcellus shale in a 

 valley, and the Hamilton sandstones in a line of blufts limiting our dis- 

 trict on the west. The latter sandstones or very similar ones continue 

 to the foot of the Cutskill Mountains in low ridges and shallow meadow 

 valleys. Whatever paleontological evidence might be discovered by de- 

 liberate observation to justify these subdivisions, the lithological char- 

 acter is so distinct that fossils are hardly necessary, except in some of 

 the limestones, for the identification of the several groups. The follow- 

 ing table shows the sequence and thickness of the strata as described 

 by several observers here by Catskill and a little farther south near 

 Kingston. 



Emmons, 

 1S46. 



Lindsey, 



1879. 



Hudson River Group 



16 



Dale, 

 1879.^ 



20 



Davis, 

 1882. 



15-20 



6-S 

 8 

 14 



40? 



noo 



70 



>1000 



* As referred to below, page 321. 



