628 "Report of the State Geologist. 



below the railroad opposite the southern end of the cut. At high water 

 the base of this part is only about one foot above water level. Below are 

 thinner layers, shown a little farther down the creek, which are at least five 

 feet thick. Some of the layers in this zone are heavy and strongly arenaceous, 

 while others composed of a compact, dove-colored limestone, very similar to 

 the Birdseye, are quite conspicuous in the lower part. In some of the layers 

 are small JPhytopsis-like tubes similar to the small ones in the Biriiseye tilled 

 with calcite. In one of the limestone layers near the bottom of this zone 

 are specimens of Leperditia which may be compared with the ostracoid 

 described by Professor Hall as Cyiherina sp. from the Birdseye limestone of 



Watertown, N. Y.* A sample from one of the limestone layers near the 

 bottom of this zone was analyzed by Mr. McKeefe with the following result : 



SiCX, 17.87 per cent. 



Fe 2 3 1.99 " 



CaC0 3 79.72 " 



MgC0 3 ...... 1.22 " 



100.80 percent. 



One of the arenaceous layers from the lower half of this zone gave the 

 following result : 



Si0 2 . . . 52.96 per cent. 



Fe 2 3 11.82 " 



CaC0 3 32.74 " 



MgC0 3 2.32 " 



99.84 per cent, 



B*. Birdseye limestone. For the most part somewhat thin layers ., u ^ l 33 ^ 

 of drab, very compact limestone with occasional quite massive layers. In 

 this rock are numerous specimens of what are considered small examples of 

 Phytopsis tubulosa, Hall, similar to those figured on Plate S (Figure lc), 

 Pal. N. Y., Volume I. This limestone is well exposed in the railroad cut 

 and the creek bank below the southern end of the cut. Below the railroad 

 track at this place there is, at the bottom of the Birdseye, a vertical ledge six- 

 feet thick of drab, typical Birdseye limestone. Near the base of this layer 

 the following fossils were found: Ttafmesquma alternata (Con.), H. and C. ; 

 Stictopora sp. ; L&perditia sp. ; and a gastropod. Next there are six feet, 

 one foot <>f which, perhaps, is covered ; and in the railroad cut, nine feet 

 and six inches of typical Birdseye. 



* Palaeontology of New York, Vol. I, p. 44, Plate X. Figure 12. 



