Texas Almanac, 1939-1940 Page: 32
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32 THE TEXAS ALMANAC-1939.
Pliocene, Miocene, and
Comanche series of the
Jurassic and Triassic
Pennsylvanian and "4
Ordovician, Cambrian, and
Cenozoic, Cretaceous, and
Texas is the meeting place of a number of geologic regions. The map above shows prin-
cipal areas of outcropping rocks of various geologic ages. It is a reduction of the Geologic
Map of Texas which accompanies Vol. 1 of The Geology of Texas, by E. H. Sellards, W. S.
Adkins and F. B. Plummer, Bureau of Economic Geology of the University of Texas.
of fruits and early vegetables are pro-
duced in numerous localities, including
Irish potatoes, melons, strawberries and
figs. The Coastal Prairies do not pro-
duce as great agricultural income per
square mile as do the Blackland Belt
and some areas of West Texas and the
Great Plains. The soils are fertile, but
much of this area is in need of drainage.
Numerous oil fields throughout this
belt have contributed to its economic de-
velopment. Spindletop, first great Texas
gusher, was in this region and a succes-
sion of other great oil fields, extending
from the Sabine River to Duval County,
have produced an appreciable percentage
of the Texas petroleum output during
the last thirty-seven years. The salt
dome formations, which supply the reser-
voirs for the oil production, are also the
source of the world's greatest sulphur
production, which comes from Wharton,
Matagorda, Brazoria and Duval Coun-
ties. Fuller's earth and a variety of
clays are also among the minerals pro-
duced on a commercial scale in this ter-
ritory. The region is peculiarly defi-
cient in limestone, but lime for cement
plants at Houston is obtained from the
shell dredged in great quantities from the
shallow bays along the coast. Natural
gas is found at a number of points,
especially in the vicinity of Corpus
Christi, giving the area an abundance of
While crops, livestock and mineral
production have constituted the basic
mdustries of the Coastal Prairies, it has
been the commerce between the great
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Texas Almanac, 1939-1940, book, 1939; Dallas, Texas. (texashistory.unt.edu/ark:/67531/metapth117163/m1/34/: accessed June 28, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Texas State Historical Association.