Geology and Natural History. 385 
feet, and I have little doubt but that these are of marine origin.” 
Mr, Dawson appreciates the objection to this view from the ab- 
sence of all marine remains and of other results of marine action 
navia and Greenland. J.D. D. 
3. Report of a Reconnaissance of the Black Hills of Dakota 
made in the summer of’ 1874; by Wrtt1am Luptow, Captain of 
Engineers, Lieutenant-Colonel U.S. A., Chief Engineer Depart- 
ment of Dakota. 122 pp. 4to, with several maps. Washington, 
875. Engineer Department, U.S. fins aa volume consists 
ofa General Report of the Expedition " 
i i ees an rubs, a “s H. Win- 
chell; a Paleontological Report, by G. B. Grinnell; descriptions 
d fi ¥ pee. B. Whitfield (including Obolus 
on French Cree 
kota, Zerebrutula Helena Whitf., from the Cretaceous on the 
time and latitude. Of the maps in the volume one is a Geo- 
logical map, by Professor Winchell, of the Black Hills on a 
inch. The rocks described by Prof. Winchell 
Am. Jour. Scr.—Tarep Serres, Vou. X, No. 59.—Nov., 187. 
25 
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