1058 



NEW YORK STATE MUSEUM 



From these lists it will be seen that a considerable number 

 of species commonly referred to the next fauna, i. e. the New 

 Scotland, are found in the upper Coeymans. In these same 

 beds Gypidula galeata is common, thus showing well 

 their transitional character. 



All of this series contains crystalline limestone, while the 

 overlying Xew Scotland contains no pure limestone. The finely 

 crystalline character of the Coeymans also distinguishes it read- 

 ily from the Manlius, which is generally compact. About the 

 middle of the eastern face of the mountain, where the beds are 

 all on end, the thickness of the Coeymans measured across the 

 strike is 42 feet. [See postea] 



The most accessible exposure of the lower and upper contacts 

 of the Coeymans is on the middle transverse mountain road 

 leading off the Ancram road a short distance south of the old glue 

 factory. One of the best places to obtain the fossils of this 

 rock is at the extreme southwest corner of the mountain on the 

 north side of the road leading southeast. The rock here is 

 exposed at the road side. 



5 NEW SCOTLAND SHALES 



These are thin bedded, argillaceous to silicious rocks, in 

 which a variable amount of calcium carbonate is present. 

 Usually this is insufficient to allow the rock to be affected by 

 acids, there being no, or but very feeble, reaction on applying 

 strong HC1. Fossils are abundant but usually only preserved 

 as molds, though, when the rock is freshly broken, the shell is 

 still found remaining. 



The following list comprises the species obtained from these 

 beds at P»ecraft mountain. 



1 Enterolasma strictum Hall. 



2 Rhipidomella tubulostriata Hall. Rare. 



3 R. e m i n e n s Hall. Several. 



4 R. o b 1 a t a Hall. Several. 



5 Dalmanella perelegans? Hall. 



6 D. cf. subcarinata Hall. Rare. 



7 Schizophoria cf. m u 1 1 i s t r i a t a Hall. A speci- 

 men showing form, convexity and striae of this species. 



