Reviews—G. K. Gilbert’s Henry Mountains. 479 
in black or red, on a greyish or yellowish ground, with lined or 
geometric patterns; while in many cases the clay vessel was rudely 
modelled into the form of birds. 
One skull, found in the Chaco Caiion, among ruins situated on 
the alluvial floor of the valley, is believed to have belonged to the 
ancient Pueblo Indian race. It is that of a female. The most 
striking feature of the cranium being the great flattening of its 
posterior portion, “including the anterior portion of the occipital 
and the posterior-superior portions of the parietal bones.” From the 
appearance of the bones this does not appear to have been a post- 
mortem deformation. 
Numerous pictorial rock-inscriptions are either chipped into the 
rock or painted in white or red clay; but among the numerous 
figures so depicted are none that resemble the horse. 
The volume concludes with a lengthy catalogue of the Cretaceous 
and Tertiary plants of North America. C. CoopEr Kine, F.G.S. 
Jil.—Rerort on tHE Geo.ocy or THE Henry Mountains. By G. 
K. Ginsert. (Washington, 1877.) 
EN years previous to the publication of this work, the district 
described therein was comparatively unknown, no mention being 
made of it in any of the published accounts of exploration in the 
Rocky Mountain region. The name of Henry Mountains was given 
by Prof. Powell during his journey in 1869 down the Colorado, on 
the right bank of which river they are situated between two of its 
tributaries, the Dirty Devil and the Escalante. Although occasion- 
ally visited, no regular survey of these mountains was made until 
that undertaken in 1875-76 by Mr. H. G. Graves and the author of 
this volume. 
The Henry Mountains do not form a continuous range, but con- 
sist of a series of five isolated mountains (described in chapter ii.) 
rising from the plain below to heights varying from 1500 to 5000 
feet ; the general elevation averages about 11,000 feet above the sea- 
level. They consist of Cretaceous, Jura-Trias, and Carboniferous 
strata, with associated intrusive masses and veins of trachyte. It is 
to the manner in which the trachyte has intruded into, and affected 
the sedimentary strata, that the peculiar physiognomy of their present 
appearance is primarily due, and which is fully described in the 
chapter on ‘The Laccolite.”” According to the author the trachytic 
lava, “instead of rising through all the beds of the earth’s crust, 
stopped at a lower horizon, insinuated itself between two strata, and 
opened for itself a chamber by lifting all the superior beds. In this 
chamber it congealed, forming a massive body of trap.” For this 
body the name laccolite (Naxos, cistern, Ao, stone) has been used. 
The dome-shaped elevation of the original horizontal strata, by the 
injection from below of a mass of molten matter, has produced the 
type of structure exemplified in the Henry Mountains, modified of 
course as to the surface features by the various subaerial agencies 
which have acted since their upheaval, the effects of which agencies 
Mr. Gilbert has clearly treated under the head of Land Sculpture. 
