The Southwestern Historical Quarterly, Volume 50, July 1946 - April, 1947 Page: 19
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Texas and the Oil Industry
land and seas, followed in Tertiary times by another incursion
of the sea and the deposition of strata to the east and southeast
of the general Balcones Fault zone. Eocene and more recent
formations therefore cover the areas known as South and East
Texas. The strata of Eocene age are productive along the
general Wilcox-Cockfield trend, while strata of Oligocene, Mio-
cene, and Pliocene ages are productive along the coastal trend.
The many adjustments between sea and land have resulted
in the formation of faults and of structure and deposition fea-
tures often buried but contributing largely to present-day fields
in the area. The Conroe Field is an excellent example of a
pronounced subsurface fold. Faults, traceable at the surface
or determined by subsurface methods or geophysical explora-
tions, have accounted for production at Silsbee, Segno, Pettus,
and other fields along the Cockfield trend. Changing conditions
of sedimentation resulting in a pinching out updip of sand
strata have been responsible for productive areas in the Mirando
trend and at Nacogdoches. The intrusion of salt masses and
the formation of such prolific reservoirs as Spindletop and
West Columbia may well be attributed to early lines of weak-
ness developed during such periods of adjustment.
General structure and deposition features controlling the
accumulation of oil and gas in the various producing regions
of Texas may be classed as follows: East Texas-faults, uncon-
formities, and buried folds; Gulf Coast-salt intrusives, faults,
and folds possibly resulting from deeply buried intrusives;
North and North Central Texas-folds, unconformities, and
faults; Panhandle-folds and unconformities; Southwest Texas
-faults, folds, irregular deposition, and salt intrusives; and
West Texas-folds and unconformities.
A general summary of the major producing formations and
the counties in which they are productive is given in the accom-
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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/m1/35/: accessed July 28, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Texas State Historical Association.