340 
GEOLOGY OF THE FIRST DISTRICT. 
3. Schoharie Grit. 
This rock is local, apparently; for I have not observed it except in the vicinity of Schoharie 
and of Clarksville. It is a fine-grained calcareous grit rock, containing a great number of 
fossils, which are mostly peculiar to that stratum. I have seen fragments of a similar rock 
in many other places, but nowhere else in place, than on the mountain about one or one and 
a half mile west and northwest of Schoharie in Schoharie county; and on the mountain one- 
half to one mile west and northwest of Clarksville, Albany county. The carbonate of lime 
gradually disappears from the rock where it is exposed to the weather, and the remaining mass 
is a rather porous and spongy fine-grained tough sandstone. Orthoceratites and the Pleu- 
rorhynchus are abundant, and are perhaps as characteristic fossils as any. I sent specimens 
of the fossils of this rock to Prof. Bronn of Heidelberg in 1833 and 1834. They are probably 
figured and described in his Lethcea Geognostica, but I have not a copy of the work for refe¬ 
rence, to know certainly whether they are described. The fossils of this rock will be figured 
and described in the Palaeontological Report. 
