260 The American Geologist. April, 1892 
: pri, 
fanensis, than the relative breadths of the two specimens would 
indicate. One of the first phalanges has a length of 4.6 inches, 
a breadth proximally of 1.75 inch, and distally of 1.5 inch. The 
other, represented by the proximal half only, has a maximum 
breadth of fully 2.18 inches. These phalanges are not stout 
throughout, but expand somewhat suddenly from a comparatively 
narrow cylindrical shaft to the upper extremity. 
The voleanic ash-beds which have yielded the type of wAuchenia 
huerfanensis are regarded by Mr. Hills as Pliocene. Teeth of 
Equus, too much worn to admit of identification, occur in the 
same deposits, which in all probability represent the ‘‘Kquus 
beds.’ But whether all of the so-called ‘‘Kquus beds” belong in 
reality to one epoch, is a matter still to be determined. 
In his monumental work on Lake Bonneville,* Prof. Gilbert has 
produced evidence which seems to definitely establish the fact 
that some of the ‘‘Equus beds” are Quaternary. On the other 
hand, Mr. Hills finds the ash-beds of the upper Huerfano drain- 
age overlaid with a conglomerate which he provisionally believes 
to be identical with conglomerates not far distant, and which are 
overlaid by true morainal deposits. 
The results of further field-work, which Mr. Hills hopes to 
prosecute in quest of the solution of the age of the Huerfano 
voleanic ash-beds, will be awaited with interest by all students of 
stratigraphic geology. 
EDITORIAL COMMENT. 
PROGRESS OF AMERICAN GLACIAL GEOLOGY. 
One of the most important contributions from American geo- 
logic exploration to stimulate similar research in Europe, is the 
tracing of the series of terminal moraines across the northern 
United States during the past fifteen years by Chamberlin, Smock, 
Upham, Wright, Lewis, Salisbury, Leverett, and others. The 
interest of Kuropeans in this class of drift deposits was greatly 
increased in 1886 and 1887 by the discovery and mapping of ter- 
minal moraines in England, Wales and Ireland, by the late Prof. 
H. Carvill Lewis, and in Germany by Prof. R. D. Salisbury. 
Another point in which Lewis was in advance of most of the 
*Monograph I, U.S. Geological Survey, 1890, chapters vi and rx. 
