Texas Almanac, 1939-1940 Page: 35
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PHYSIOGRAPHY OF TEXAS.
Photo by Miss Caro lyn :Ramsey, M;rshall. Te' s.
This scene on Caddo Lake on the Texas-Louisiana boundary line is in sharp contrast to
that showing the barren face of the Mesa de Anguila through which Santa Helena Canyon
is cut by the Rio Grande. See p. 41. The two scenes represent the extreme east and
extreme west of varied Texas.
northeastern to 25 inches at the south-
western end. The Postoak Belt lies princi-
pally in the broad band of the Eocene
which extends from northeast to south-
west across Texas, though it extends also
into the Pliocene-Miocene on the lower
side and into the Cretaceous on the upper.
Like the Rio Grande Embayment, it has
no great physiographic unity but de-
serves a name primarily because of its
in-between position. Soils are sands and
sandy loams principally of the Kirvin-
Norfolk, Kirvin-Bowie and Lufkin-Sus-
quehanna classifications. Cotton is the
principal crop. Corn, sweet sorghums
and a variety of fruits and vegetables
are grown. Dairying, swine raising and
poultry production are general.
Oil and gas are produced from several
fields in this area and many deposits of
lignite are found.
The economy is primarily that of a
region deriving its livelihood from agri-
cultural pursuits. There is no city of as
much as 10,000 population within this re-
gion, though Palestine and Tyler are
near its eastern and Greenville and Cor-
sicana near its western border.
Above the postoak belt, and highest of
the Coastal Plains subdivisions, lying
immediately below the Balcones Escarp-
ment in its middle course, are the Black-
land Prairies. They correspond roughly
to the Gulf Cretaceous geologically. The
blacklands extend from the Red River
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Texas Almanac, 1939-1940, book, 1939; Dallas, Texas. (texashistory.unt.edu/ark:/67531/metapth117163/m1/37/: accessed July 24, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Texas State Historical Association.