1 94 Review of 'Recent Geological Literature. 
judgino- from the evidence slowly coming to light in different 
parts of the world. 
So far as it is possible to decide from the printed testimony 
Dr. Hicks has made out a good case in the Cae-Gwyn cave for 
inter-glacial man but it does not appear to us that his evidence 
]")roves human existence in pre-glacial time. 
KH\l!i\V Ol- RHCENT GliOLOGICAL LITERATURE. 
Geology and mining iiidustry of Lcadvillc, Colorado, ■vuith atlas. By 
Samuel Franklin Emmons. (Monographs of the IJnited States geolog- 
ical survey; volume xii). The work which is here reported on was bogun 
in 1879, under the direction of Clarence King, the first director of the 
IJnited States geological survey. The letter of transmittal is dated Oct. 
1, 1885, although the report was essentially completed four years ear- 
lier, when a full "abstract" of it was published in the second annual 
report of the director of the survey. The volume is very largely from 
the hand of Mr. Emmons, including the general and descriptive geo 
logy, and the discussion of geological phenomena. The entire descrip- 
tion of the mining industry is also by Mr. Emmons. The petrography is 
by Whitman Cross, the chemistry by W. F. Hillebrand and themet- 
.-illurgy by Anthony Guyard. The atlas was prepared under the di- 
rection of A. D. Wilson, chief topographer, and the paleontological de- 
terminations wei'c made by Mr. R. P. Whitfield. It is useless to attempt 
here an adequate account of this admirable volume and the atlas 
which accompanies it. It compares most favorably with other volumes 
<A tlie series which have been issued by the survey. The author gives 
tiie following brief outline of results of the study. 
The inosquito Range, tlie study of whose geological structure formed 
a necessary basis for that of the ore deposits of the Leadville region, is 
•the western boundary of the South Park, and has thus been considered 
from a topographical standpoint to form part of the Park Range. Geol- 
ogy shows, however, that in Paleozoic times the boundaries of the de- 
pressions now known as the parks were formed by the Archean land 
masses of the Colorado Range on the east and of the Wasatch and its 
•continuation to the north, the Park Range on the-west, and that the uplift 
of the Mosquito Range did not occur until the close of the Cretaceous. 
Prior to this uplift the various porphyry bodies, which now form a 
prominent feature among the rock formations of the region, were intru- 
ded into the sedimentary beds deposited during Paleozoic andMesozoic 
times, spreading out between the beds and sometimes crossing them, 
ijut being most uniformly distributed at the top of the Lower Carbon- 
