~ 
546 Recent Literature. . _ [August, 
without omissions, has been apparently well done, and it remains 
for those whose names are mentioned in it to keep the Editor 
informed as to the changes in residence, &c.; in this way a work 
in which all are interested may be well maintained. 
HAYDEN’S GEOLOGICAL AND GEOGRAPHICAL ATLAS OF COLO- 
RADO.\—The publication of this noble work is appropriate at the 
present time, as indicating that our government, although subject 
to the vicissitudes so incident to its popular form, does not forget 
the highest interests of the people. The great survey under 
Hayden, of which the present atlas is the latest product, appeals 
in it to the public interest in the most direct manner. Nothing 
n be more desirable for a community to know than the material 
constitution of their possessions, and in no way is this knowledge 
more quickly and exactly communicated than by the geological 
map. 
This atlas consists of sixteen folio maps, in two series. The 
first of these consists of four maps on a scale of twelve miles to 
the inch ; the second of twelve sheets on a scale of four miles to 
the inch. the second series, six maps are topographical and 
six geological. The maps of the first series include a drainage 
map and a map indicating the distribution of vegetation. The 
importance of the latter to the emigrant is alone ‘worth the cost 
of the atlas. The topography is expressed by contour lines 
representing intervals of two hundred feet, which is the best mode 
of expression of surface configuration. The various types of 
country are thus perceived at a glance; the craggy peaks, the 
FIA and the cañons being as well marked as in a birds-eye 
vie 
la the geological department Dr. Hayden’s work is promi- 
nently displayed. The vast series of Mesozoic and Tertiary 
strata which form the seated district of our continent were first 
distinguished, located and stratigraphically defined by the author, 
who has now the satisfaction of seeing his prolonged labors set 
forth in a form commensurate with their importance, so far as 
regards the great State of Colorado. No more extensive area, 
horizontally or stratigraphically, ever fell to the lot of a single 
geologist to translate into the language of science, than has been, 
or the past twenty-five years, the heritage of Dr. Hayden. The 
randeur of the result may be estimated by remembering that 
the present atlas covers a very small fraction of the area explored 
and digested. An examination of the present series of maps will 
furnish some idea of the labor and energy expended in the work. 
We have here the results of the studies of Dr. Hayden’s able 
_ corps of assistants as well as of his own. Of these gentlemen it 
would be invidious to select any for special mention. The suc- 
1 Geological and io spose’ Atlas T a oe ai aes ns of adjacent territory. 
ue . V. HAYDEN, U. S. Geologist-in-c ment of the Interior, Un ited 
oe and Geographical Savers of Fy Territories, 1877. 
