1894. | NEW YORK ACADEMY OF SCIENCES. 165 
which had been sent him by Prof. C. H. Hitchcock. These lat- 
ter comprised true camptonite, diabase and olivine diabase. <A 
series entirely parallel with the typical ones at Campton in the 
Pemigewassett valley. Prof. Kemp commented on the resem- 
blance of the olivine diabase to the boulders and advocated the 
derivation of the latter from some undiscovered but extraordi- 
nary and abnormal dike. A meteoric source does not seem 
probable. 
G. Van Ingen, “ Notes on the Geology of Ulster County, 
N.Y.” The author described several interesting sections along 
Esopus Creek, west of Rondout, and indicated with the aid of 
the lantern their geological relations. 
MICROSCOPIC ORGANISMS IN THE CLAYS OF NEW 
YORK STATE. 
By Hernericu RIks. 
The occurrence af organic remains in the clays of New York 
State has always been of great interest, not only as a means of 
determining the age of the more extensive beds, but also as an 
indication of the conditions under which the clays were de- 
posited. 
It was the great scarcity of macroscopic fossils which led me 
to search the clays for microscopic organisms and the results, 
while not extensive, are interesting and suggestive. 
The clays of New York may be separated into three groups: 
Quaternary clays, which include the many local deposits 
scattered over the State and the estuary clays of the Hudson 
and Champlain Valleys.+ 
2. Tertiary clays, which probably occur on Long Island.* 
3. Cretaceous clays, which occur on Staten Island, and on 
Long Island at Glen Cove and possibly other localities. 
Before describing the results of my observations it may be 
well to note briefly what organic remains have already been re- 
corded from the clays. The estuary clays along Lake Cham- 
plain and at Madrid, St. Lawrence County, contain numbers of 
marine shells belonging chiefly to the genera Macoma and Tel- 
lina. The skeleton of a whale has also been found in the clay 
of the Champlain Valley. In the Hudson River clays the only 
*Geology of Long Island. F.J.H. Merrill. Ann. N. Y. Acad. Sci., Nov., 1884. 
