« h 



MUSEUM OF COMPARATIVE ZOOLOGY. 



313 



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

 valley^ and the Hamilton sandstones in a line of bluffs limiting our dis- 

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

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

 valleys. Whatever paleontologieal 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. 



Grits, 



OrisUaiiy. 



Upper Pontamcrus and 

 EiicrinaL 



CatskiU Shaly- 



Lower Pentamcrus- 



(Uppcr UibboTi.) 



Kibbnn, 



Strouiatnpora. 



TculaoulitG- 



Watorlimc, 



Coralline. 



Calcareous 

 gritty shales. 



Fraiirineutal 



aandy lime- 

 stone. 



Heavy and 



eross-bedded 



Itniestoiic. 



Mather, 

 184;i. 



'4-2 



Thin-bedded 



impure slialy 



liuiestone. 



Kuoiled 

 limestone. 



Fine-bedded, 

 j~-^ Spungedayei', 



i=:^5 Fini! bedded. 



nud^un lUver Group. - JZIE ' ■ ^' '^^' j^li:^' ' '^- 



h , J 



'^^^^^'ITTrTvTZLJe'i' ■ '/ ■ ' ii 



Shaly linic- 

 stone. 



Khales and 

 line sand- 

 stones. 



50 



^100 



<' to 



lf>0 



/ 



Emmons, 

 bS46. 



Liiulsey, 

 1879.* 



25 



25 



30 



60-80 



Dale, 

 1870. * 



20 



20 



Davia, 

 1882. 



120 



16 



25 



6-8 



14 



40? 



15-20 



20 



? 100 



80 



(h-8 



i\ 



70 



>1000 



* As referred to below, page 321. 



II 





