The border vidette. (Nogales, Ariz.) 1894-1934, 1925-05-16
MAP OF ARIZONA
PUBLISHED.

The Arizona Bnreau Of Mines
announces that it now has in
stock three thousand copies of
the Geological Map of Arizona
upon which it has been working
for many years in cooperation
with the United States Geolo.
gical Survey. The gathering of
field data for the preparation of
this map was completed nearly
two years ago. and it has taken
most of the time that has since
elapsed to engrave the fourteen
plates from which the map was
printed and to complete the
printing therefrom.~
The completed map is in one
sheet which measures about
three feet eight inches by four
feet ten inches. 1t is on the
same scale as the Topographic
and Base Maps of Arizona al.
ready issued by this Bureau. or
about eight miles to the inch,
and is printed in twelve colors
and black. By the use of con.
ventional symbols it has been
possible to differentiate between
thirty three different geological
formations or types of rocks.
The map also shows the location
of many of the more important
topographic features and towns,
together with all railroads and
land surveys.
Because of the relatively small
scale used in drafting the map,
it has not been possible to show
the smaller geological features,
but it is believed that the map is
more accurate and detailed than
any that has yet been issued of
a State of the size and geologl.
cal complexity of Arizona.
That a great demand exists
for the map is shown by the
testimony of the many engineers
and mining men who have visit
ed the Bureau for the purpose
of studying the proof, and by
the number of advance orders
already received.
It is comparatively easy
matter for any geologist after
studying the map to decide
which part of Arizona are most
favorable for the accumulation
of petroleum, and where it is
least likely to be found. 1t also
points the way to q search for
coal and many metallic and non
metallic mir erals. In the future
no one will wish to undertake a
mining or geological examina
ton in Arizona without first
equipping themselves with a
copy of the map. The Bureau
now has in press a voluminous
and beautifully illustrated book
by DIR. N. 81. Darton entitled "A
Resume of the Geology of Ari.
zona," which is intended to &C.
company the map. and which
contains detailed descriptions of
the various geological forma.
tions with many sections and
other valuable geological data.
A small key map at the bot
tom of the sheet shows the
sources of the principal data
used in compiling the map. A
study of this key will show that
/ when the Arizona Bureau of
Mines undertook the preparation
of a geological map of the state,
reliable data concerning less
than one eighth of it was avail.
able. For very large areas, in.
Guiding large parts of centre
counties no geological data had
been published, and practically y
nothing was generally known
concerning the geological con.
ditions existing there. Men em,
ployed by the Arizona Bureau of
! Mines have been responsible for
collecting the information used
in mapping geologically forty.
four percent of the State. The
services of DR.. N. H. Darton, of
the U. S. Geological Survey,
we're loaned to the Arizona Blu.
reau of Mines for about a year
and a half, and that Bureau paid
his field expenses during that
time. He mapped or remapped
thirty.seven percent of the area
included on the map. Fourteen
other men; including many EN-.
ployees of the U. S. Geological
Survey, contributed the remain.
ing data used in compiling the
map.
For several months the Blu.
| roam haS hnon 0iStrihutino q