178 TRANSACTIONS OF THE [may 13, 
drawn by Mr. Hollick, and most of the specimens deposited in 
the Museum of the Natural Science Association of Staten Island, 
at New Brighton. They will perhaps form the subject of a sub- 
sequent communication. Considerable additions to the collec- 
tions of this material have recently been made, and the nodular 
concretions have been again observed on the shore at Prince’s 
Bay, but those from this last-named locality have hitherto proved 
barren of fossils. Similar masses have been observed at Clifton, 
where one specimen containing a leaf-impression was obtained, 
and again near Pleasant Plains station. 
While we have always supposed, from the occurrence of these 
masses, that they were of Cretaceous age, it is only very recently 
that evidence has been available which appears to be conclusive 
on this point. On May 1st, I went with Mr. Hollick along the 
north shore of the Raritan River, from Perth Amboy, for several 
miles. ‘There are steep banks along this entire stretch, except 
where interrupted by areas of salt meadow which occupy ancient 
fiords, cut out by streams when the continent stood higher than 
it now does. At the base of these banks we noticed the concre- 
tions that we had become so familiar with on Staten Island, 
some of them containing vegetable remains. We soon found 
the concretions exactly in place in the Cretaceous brick-clays, 
which we had never been able to observe on Staten Island. 
Further than this, we collected specimens which contain numer- 
ous casts of Lamellibranch and Gasteropod mollusca evidently 
of Cretaceous types, but not yet submitted to Professor Whit- 
field fordetermination. These masses are closely similar to those 
from Staten Island, and it would appear quite certain that they 
must be of the same geological age. ‘The species all appeared 
to be different from those hitherto known from the Plastic Clays, 
and will add materially to the fauna of that horizon. 
Kaolin.—An outcrop of this material has recently been ob- 
served at low water on the shore of Staten Island, at the base 
of the bluff at Prince’s Bay, between the grounds of the Light- 
house Department and the pier of the Catholic Children’s 
Home. It is of the same mineral composition as that found 
near Kreischerville and alluded to by me in the ANNALS, II., 171 
(1881). Indeed, it may be remarked that this substance is one 
of the most characteristic elements of the entire Plastic Clay 
series. No organic remains have as yet been obtained from 
it. Its geological position, as made out by Prof. Smock,’ is 
nearly midway in the Plastic Clays, and it is only known from 
one horizon,—the bed averaging, in Middlesex County, N. J., 
ten feet in thickness, and probably a little more than that at 
1 N. J, Geol. Survey, Report on Clays, 1878, p. 34. 
