1895. | NEW YORK ACADEMY OF SCIENCES. 15 
many of them readily recognizable as cretaceous species, and 
there seems to be no reason to doubt that the entire collection 
is to be referred to that horizon. They were found in fragments 
and concretions of ferruginous sandstone, indistinguishable in 
their mode of occurrence and lithological characters from the 
material already described by me from Long Island and Staten 
Island. As, however, the collections by Mr. David White, pre- 
viously referred to, were much more extensive and have been 
already partially described, I have thought it best that some one 
person should study and describe the combined collections, and 
hence shall do no more on this occasion than to exhibit the 
specimens, in order that they may be compared with those from 
Long Island, Staten Island and New Jersey and their identity 
noted, leaving their elaboration for some future occasion. 
The molluscs were found at Indian Hill, where they occur in 
drift material of a ferruginous character, almost identical with 
similar specimens from Arrochar, Staten Island. In connection 
with the material in which the molluses occur there is quite a 
mass of sandy clay, evidently due to glacial transportation ‘ en 
masse,” and the ordinary sand, gravel and bowlders of the 
moraine. Comparing this material with the Gay Head, Long 
Island and Staten Island specimens, and the conditions under 
which it occurs, we can not doubt an identical derivation for 
all, from former cretaceous or post-cretaceous strata to the 
north, and transported to their present locations through the 
agency of the ice sheet. 
Professor Shaler, in his report, mentions the Indian Hill 
locality and the “small angular fragments of a reddish sand- 
stone, which contain six or eight well marked species of cre- 
taceous mollusea.” He is, however, unable to accept any other 
theory to account for their presence there than “ that the cre- 
taceous beds whence these fragments were derived are in place 
at some little depth beneath the surface, within a few hundred 
feet of the locality where the cretaceous waste now lies.” If 
we are to consider “in place” as comprehending strata which 
have been moved from their original position, while retaining in 
a large part their integrity, this theory is entirely in accord 
with the present condition of our knowledge. Even this inter- 
pretation, however, is not a necessary one, and I should be 
more inclined to attribute the origin and present distribution of 
this material to transportation of incoherent material and its 
subsequent hardening, without necessarily inferring the imme- 
diate proximity of the strata from which it was derived. 
I am also led to this conclusion from the fact that similar 
fragments, identical lithologically, are to be found throughout 
