66 



chus limitaris ( Conrad ). Several other species occur, but on 

 the whole fossils are rare, and a day's search niav furnish 

 only a very meagre collection. A small specimen oi Nautilus 

 marcellensis (Vanux. ) was found in the Pteropod bed. This 

 fossil has heretofore been known onh- from the Goniatite 

 limestone, between the lower and upper Marcellus of Central 

 New York. 



About six feet below the top of the Marcellus, occurs a 

 hard layer, about two inches thick, containing Ambocoelia 

 umbonata (Conrad) in considerable numbers. This bed 

 appears about ten feet above the water in the cliff behind 

 the Hospital. In the shale below it, carbonized plant 

 remains occur occasionally. The cliff is succeeded by a long 

 stretch of low, sandy .shore, with no rock outcrops. 



BAY VIEW CLIFF. 



I'LATE XXVII. 



This clift' extends southward for about two thousand feet 

 Irom the Bay View House (formerly Comstock's tavern). 

 The cliff, where hifjhest, does not exceed fifteen feet in height, 

 while the greater portion is much lower. The outline of the 

 cliff is a zigzag one, this being due to the two sets of joint 

 cracks, which traverse the rock, and intersect at nearly right 

 angles. The Marcellus shales alone are exposed in this cliff, 

 and fossils are few, consisting chiefly of the pteropods 

 Styliolina £ssureUa (Hall) and Tentaculites gracilistriatus 

 Hall. Lunulicardium fragile Hall and Chonetes lepida Hall, 

 are occasionally found. Chonetes mucronata Hall, and a 

 few other Marcellus species also occur. 



At the southern end of the section, the hard layer with 

 Ambocoelia umbonata (Conrad) appears about ten feet 

 above the water. It is here two inches thick. Six inches 

 above, is a similar laver one inch thick, the two appearing 

 as prominent bands wherever the section is fresh. 



A little to the north of the Bay View House, the shale 

 disappears, and the beach from this point to the Niagara 



