The Dickinson press., 1908-07-18

-
another map showing the outcrop and
distribution Of the high grade terti.
airy clays of western North Dakota.
The whole volume is devoted to the
clays Of North 0AKota.
Part Five, Methods of Brick Manu-.
facture and Description of the North
Dakota Industry, by G. H. Clapp, con-
tains the Mining Of Clay, the Manufac.
ture Of Brick, and the North Dakota
Brick Industry. The larger portion OF,
the report was prepared by MI. Clapp,
who deserves much credit for the
care and thoroughness with which he
performed the task MI. Clapp spent
the summer Of 1905 in mapping the
clays, noting their extent, ~character,
formation and collecting many sam.
pies. During the summer Of 1905 Mr..
Clapp visited all Of the clay plants
Of the state in order to secure full In.
formation concerning them, including
their methods Of manufacture. Addi-
tional clay samples were obtained for
analysis and testing, and samples OF
brick and tile were collected and
tested for strength and durability.
The thorough familiarity Of Professor
E. ]. Babcock Of the state university
with the clays of the region, gained
through many years of experimental
work on them, was Of much service
in the preparation Of this report. His
discussion of the practical tests made
by eastern potteries and brick plants
upon North Dakota clays, including
many kinds of pottery, terra Gotta
and pressed brick exhibited at the
| Worlds Fair at St. Louis, is Of great.
value, and shows the possibilities of
our cIays, even for high grade uses.
The volume may be had on applica'
ton, enclosing postage, which is four
teen cents.
During the summers of 1865 and
1906 field parties. under Professor A.
G.. Leonard, were employed by the
United States Geological Surve." in
work upon the Ignite area Of West
ern North Dakota, Eastern Montana
and Northwestern Wyoming. Tho
work has resulted r. the collection Of
an immense amount of data in regard
to the Ignite and especially in regard
to its occurrence in North Dakota.
Work was continued on the problem
during the summer of 1907. A pre-
liminary report of the results of the
work has already appeared in Bulle-
tin 316 of the United States Geologic
al Survey, and a complete report will
soon be published in a bulletin Of
the same organization. North Dako.
ia. Ignite passed the best tests at: St.
Louis at the fuel testing plant ofathe
United States Geological Survey for
use as gas producers. The above
clearly shows that the national au.
thorities appreciate the work Of the
North Dakota Geological Survey.
The United States Geological Sur
vey has published Topographic maps
of eleven quadrangles in North Dako-
ia. The geology Of these districts
can be mapped in detail, the distribu-
ton Of the formations accurately
shown and in general, the geologic
field work can be done more accurate
ly and more quickly, which means a
great saving. The Topographic maps
are Of excellent. quality and are of
greatest value. to the inhabitants of
the ~quadrangles. Only a nominal
charge, five cents a sheet, is made for
them. Instructions for use are print.
ed on the back The list of published
mars and the maps themselves may
be had upon application to The Direc.
tor, United States Geological Surve.4
Washington, D. c.; or. to DR.. A. G..
Leonard, State Geologist, University,
N. D.
In the foregoing, ellusion has been
made to other geological surveys and
". st<S-