Geology and Mineralogy. 821 
The volume also treats of the rocks of the Merrimack district, 
the Lake enero the Coast district, and the district of northern 
New Hampshi 
he se Map, illustrating this volume, is in the hands of 
the engraver, It is onascale of two and a half inches to the 
mile, 
The third and last nee of the Survey will contain a mport 
y Mr. Warren Upham on the Sine aternary of New Hampshire 
ee one by Mr, George oW. Hawes, on me Catoes of the State, 
we chemically and microscopically con 
Penelipinory Report on the Pale sos Bei of the Black ‘Hills, 
¥ WN gee t S. Geogr. and Geol. Survey of the 
Rocky filha region, J. W. Powxt in Charge. 50 pag 
8vo, July, 1877. Washington.—This valuable report conta eH 
and of Cretaceous species, seventy. The sixteen be agTeDNNS 
plates are bse of well-drawn aoe finely enere ee? figu 
Age of the Tejon group, Californ ~The Dion is 
from a cee by Dr. J. G. Cooper in the Re enge of the Cali- 
fornia Academy of Scienc ces, for Nov. 16, 1874 —The # baat of 
the age of the Tejon group is so far derived from only a few marine 
fossils which have been refer rred by different ee to the Ontee 
Conrad, the Nestor of Ameri- 
can paleontologists, over twenty years ago, phe a as unmis- 
s, now known as the Tejon group, 
among which he thought was the Cardita planicosta, “that finger- 
post of the Eocene, both in Europe and America.” Mr. Gabb, 
finding from better specimens that this shell differed from Cardita 
planicosta, described it as new, and referred the Te gon group to 
the Cretaceous, finding in it a very few species which 
identical with the lower ioe proved to be Cretaceous by the 
presence of numerous Ammonites. He also stated, in an article in 
our Proceedings, publi ner November, 1866, that “a solit tary 
the lower ones, less than one-tenth of ig a Cretaceous shells being 
Am. Jour. Sci. Ses Senizs, Vou. XIV, No. 82.—Ocr. 
