Report of the State Geologist. 



397 



The work of preparing and arranging the large collections 

 referred to above has been done under my direction by Mr. Charles 

 Schuchert and he has reported to me this catalogue with the 

 following remarks : 



In preparing and arranging the large quantity of material from 

 this formation, collected at Cumberland, Maryland, Albany and 

 Schoharie counties, New York, and in the neighborhood of 

 Cayuga, Ontario, in the collection of Professor James Hall, he 

 suggested that it would be a matter of interest to determine the 

 number of species known in this formation in our present state of 

 knowledge, and how many species passed from the Lower Helder- 

 berg into the Oriskany Sandstone, and from the latter into the 

 Upper Helderberg. 



The following list contains all the species observed in the above 

 collections as well as those described in the different volumes of 

 the New York Geological Survey and the Geology of Canada, 1863. 



There are 140 species enumerated as occurring in the Oriskany 

 Sandstone, of which 17 are common to the three widely separated 

 localities. Fourteen of these belong to the Brachiopoda, which 

 are by far the most numerous in specimens and species, 72 being 

 known. The Gastropoda are quite abundant at Cumberland, Md., 

 while in New York and Ontario they appear in greatly reduced 

 numbers. 



Fourteen species pass from the Lower Helderberg into the 

 Oriskany Sandstone, distributed as follows: Nine in Maryland, 

 two in New York, and eight in Canada West. From the Oriskany 

 Sandstone, 54 species pass into the Upper Helderberg. Of these 

 52 pass from the Oriskany of Ontario, Canada West into Upper 

 Helderberg, while seven only are known to pass upward in New 

 York and the same number in Maryland. 



At Cumberland 63 species have been noticed of which 21 are 

 common to this and the New York localities. Forty-six are 

 noticed as occurring in New York, and of these 21 are also found 

 at Cayuga, Ontario, while at the last named locality 76 species are 

 recorded, 19 of which also occur at Cumberland. 



