Block Mountains in N. Mexico. — Johnson. 139 
By a comparison of the dotted lines in figures 2 and 3 it 
will be seen that the total displacement (between a and i) is 
exactly the same. The nature of the displacement is the same. 
The only difference is one of quantitative distribution. Of 
coursie any combinations of variations between these two ex- 
tremes may, and many do, occur. 
Van Hise has emphasized the fact that the same displace- 
ment may be brought about without any definite faults being 
produced, as a result of numerous minor slips along planes of 
fissility, so that the deformation is spread over a considerable 
area. If such deformation were confined to a comparatively 
narrow zone the mountain form might be produced, while if it 
were wide-spread enough, no such form would result. In the 
same way a given displacement may be brought about by step- 
faulting with or without the production of mountain form. 
SOME EVIDENCE OF TWO GLACIAL STAGES IN 
THE KLA.MATH MOUNTAINS IN CALIFORNIA. 
By Oscar H. Hershev, Berkeley, California. 
Introductiox. 
In the early part of last summer, the operations of t!ic 
Trinity Gold Placer JMining Syndicate, Limited, in its hy- 
draulic mine at the junction of Union and Cofifee creeks, in 
Trinity county, California, brought to light two tusks of one 
or more large animals, either mastodon or elephant. Such re- 
mains are rather widely distributed and frequently found in 
California, but the writer early recognized the more than us- 
ual importance of this find because of the altitude of the local- 
ity, the ruggedness of the country, and the fact that undoubted 
glacial deposits were known to occur on Union creek within 
one and one-half miles of the mine, so that careful studv of 
the vicinity might furnish data for determining whether llie 
animal or animals lived l)efcre, during or since the "Glacial 
Epoch" of California Quaternary geology. 
The property is popularly known as the Nash mine, from 
a former owner. Through the courtesy of the superintendent, 
Mr. William Maitland, who takes a lively interest in the local 
geology. I have been furnished with imiKirtant infcrniation in 
