Remarks on the Rocks of New York. 123 
More than one hundred feet in depth of the old red sandstone, and 
another hundred feet of the first four strata just mentioned, are seen 
at one view at the lower falls of the Genesee. In the calciferous 
slate which forms the precipitous banks of the river at and above 
the lower falls, and which is strongly bituminous, trilobites are found 
in abundance. Asaphus caudatus, as figured in Buckland’s Geol- 
ogy and Mineralogy, abounds, and is associated with the Orthocera- 
tite and Productus, and occasionally Spirifer. Another trilobite is 
less abundant, and a third species still more rare, Calymene Blu- 
menbachii? It has been found in the thick layer of the fragile ar- 
gillaceous slate which lies above the ferriferous sandrock, and is pre- 
cisely the same rock as the ferriferous slate which lies under the 
same stratum and which in truth occurs all through the calciferous 
slate in thin layers. In the rocks still lower in the geological series 
the species of tribolite abound. ‘The trilobites of Trenton falls and 
of the neighborhood of Utica, had placed those rocks in the transition 
series ; but it was supposed they were of very limited extent. It 
‘needed only the evidence, now arising from the existence of trilo- 
bites alone, to prove that the rocks immediately above the sandstone 
belong to the same formation with those at Trenton falls, and that 
the rocks of this section belong to the transition series. e 
tion and fossils place the rocks far below the secondary, and render 
utterly improbable the existence of coal in them or under them. 
hey rank with the mountain limestone of Europe and rest on the 
old red sandstone. Several names of the rocks given by Prof. 
Eaton to this mountain limestone are very appropriate, and they 
make an intelligible reference to different portions of the strata very 
easy and satisfactory. Still, they seem to form only different parts 
of the great formation of mountain limestone. Its whole thickness 
here and southward in the state, will be more than a thousand feet. 
Rochester, August, 1 
Nors.—The remains of the elephant in the museum of Mr. Bishop, noticed in 
the last number of this Journal, belong to one species of the mastodon. The teeth 
of the elephant were from some plaee, it is sai in Ohio. Those of the mastodon 
were found with the tusk in Perinton, as descr C.D. 
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