PREFATORY NOTE. 
The following treatise is practically the same as that 
submitted to the Syracuse University in June, 1893, for 
the degree of Master of Philosophy. 
‘The work will be found serviceable in locating and 
identifying the various geological epochs found in this 
vicinity. The descriptions are not designed to be suffi- 
cient in themselves for identifying specimens. They were 
added simply to give students, | doing field work in our 
county, a list of the more abundant species. We can, how- 
ever, by knowing the exact localities in which certain 
periods, groups and layers occur, together with the speci- 
mens found in them, practically, although not positively, 
identify many of the fossils from the descriptions given. 
| ‘PHILIP F, SCHNEIDER. 
Syracuse, N. Y. | January, 1894. 
