The Southwestern Historical Quarterly, Volume 50, July 1946 - April, 1947 Page: 18
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Southwestern Historical Qucrterly
known; but production is now being secured along the Bend
Arch from strata of Mississippian age, in Andrews, Crane,
Ector, Gaines, Upton, and Winkler counties from strata of
Devonian age, and in Ward and Winkler counties from Silurian
Deposits of Pennsylvanian age spread out over a broad area
to the north, west, and southwest from the Llano Uplift. Lower
Pennsylvanian strata have been prolificly productive horizons at
Ranger and in other fields on the Bend Arch. Horizons of Mid-
dle and Upper Pennsylvanian age are major sources of pro-
duction in North and North Central Texas.
A shifting of seas at the close of the Pennsylvanian age re-
sulted in the formation of the West Texas basin in which were
deposited the thick Permian sediments which contain important
productive horizons in West Texas and the Panhandle and have
yielded considerable oil in North Texas.
The deposition of Triassic formations followed those of Per-
mian age over large areas of western Texas and was succeeded
by minor deposits of Jurassic age. Neither is now of any
great economic importance as an oil producing horizon in Texas.
With the close of the Jurassic age came the beginning of
another major sea invasion of Texas and the deposition of
Cretaceous strata over practically the entire state. Advances
and recessions of the seas, accompanied by changes in depth,
resulted in the deposition of such important strata as the
Trinity series, the Edwards lime, the Woodbine sand, and the
Taylor, Navarro, and other formations. The present impor-
tance to the oil industry of the conditions under which these
strata were deposited is exemplified by the formation of the trap
constituting the East Texas oil field. This formation resulted
from the deposition of the Woodbine sand against the Sabine
Uplift, followed by erosion and the unconformable deposition of
the impervious Eagle Ford shale and Austin chalk which caused
a sealing off against the further migration updip of oil and gas
in the porous sand members. Cretaceous horizons have proved
of major economic importance for oil and gas production. They
are the source of the first recorded production from the Dullnig
wells, and they have yielded the East Texas and other fields in
the vicinity of the Sabine Uplift, as well as the fields of the
Corsicana, Mexia, Powell, and Luling areas and other sand and
lime pools extending from Rodessa to Maverick County.
The Cretaceous age ended with a readjustment between the
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Texas State Historical Association. The Southwestern Historical Quarterly, Volume 50, July 1946 - April, 1947, periodical, 1947; Austin, Texas. (texashistory.unt.edu/ark:/67531/metapth101117/m1/34/: accessed November 22, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Texas State Historical Association.