Geology and Natural History. 305 
2, Cretaceous of Long Island.—In a notice of the United States 
geological map of Hitchcock and Blake, on page 64 of this vol- 
ume, the representation of Long Island as Cretaceous is objected 
to. Prof. Hitchcock writes us that the authors were guided in 
their decision on this point, not merely by the report of Prof. 
Mather on the subject, but also, by more recent and satisfactory 
beneath the drift, and on the fact that shells and some bones had 
been obtained at various times in digging wells and other ways, 
indefinite geological value. The evidence was so incomplete that 
the Cretaceous of Long Island does not appear on the gevlonee 
L 
Trippel and Credner to the American Bureau of Mines in 1866. 
n this, as in the earlier published reports of Messrs. Whitney, 
Blake, and others, these deposits of Ducktown are indicated as 
the local impregnations sometimes give the aspect of a passage 
: i lode to the adjacent rock, Fine samples of lodes, 
intercalated for considerable distances with the strata, are Seem M™ 
the granite veinstones which abound in the gneisses an mica- 
schists of the Montalban or White Mountain series 1n some parts 
f aine, as described by me in the American Journal of ® 
or March, 1871; and also in the thin parallel veins which, at 
Am. Jour, — Vot. VI, No. 34.—Oct., 1 78. 
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