366 NEW YORK STATE MUSEUM 



Feet 



3 Dark bluish gray, somewhat impure limestone, in beds of 



variable thickness ; often packed with Orthis cos- 

 tal i s Hall, which occurs with more or less frequency 

 through the whole mass. Other fossils are : L i n g u 1 a 

 huronensis Bill., Ha r pes antiquatus Bill., 

 H. ottawaensis Bill.(?), Illaenus arctu- 

 r u s Hall, (I b a y f i e 1 d i Bill.) , Lituites sp. ( ?) . . . 110 



4 Gray, tolerably pure limestone in beds 8 to 20 inches thick, 



separated by earthy seams, the bedding being uneven. 

 Many layers consist of crinoidal fragments, largely of 

 Paleocystites tenuiradiatus Hall. Near 

 the middle of the mass for a thickness of 10 feet, some of 

 the fragments and small, ovoid masses ( B o 1 b o p o r - 

 i t e s a m e r i c a n u s Bill.) are of a. bright red color . 90 



Making for the total thickness of A 338 



Group B (Middle Chazy) 



1 Impure, nodular limestone containing M a c 1 u r e a 



magna Les 25 



2 Gray, massive, pure limestone, abounding in crinoidal 



fragments 20 



3 Bluish black, tl^ck bedded limestone, usually weathering 



so as to show pure nodular masses enveloped in a 

 somewhat impure lighter colored matrix; everywhere 

 characterized by M a c 1 u r e a magna. Near the 

 middle of this mass for a thickness of about 30 feet, the 

 fossils are silicified and of jet-black color. The more 

 important besides Maclurea, are species of Stropho- 

 mena, Orthds and Orthoceras 210 



4 Dark, compact, fine grained limestone, with obscure bed- 



ding, weathering to a light gray. Fossils are infre- 

 quent, but at a single locality were collected Orthis 

 perveta Oon., O. platys Bill., Leptaena 

 f a s c i a t a Hall, A s a p h u s c a n a 1 i s Con., 

 Cheirurus polydorus Bill., Harpes sp. und., 

 Illaenus incertus Bill., Lie has mingan- 

 e n s i s Bill., Sphaerexochus parvus Bill., 

 and several undescribed species 20 



