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GAS NORTH AND WEST OF FORT WORTH. 19
Log of well at Southern Methodist University-Continued.
Thick- Depth.
ness.
Cretaceous system-Continued.
Trinity group-Continued.
Glen Rose limestone-Continued. Feet. Feet.
Sand rock................................................................... 6 1,936
Limestone and shale........................................................ 9 1,945
Limestone.................................................................. 16 1,961
Limestone, hard............................................................ 9 1,970
Limestone.................................................................. 22 1,992
Limestone, hard............................................................ 40 2,032
??........................................................................... 47 2,079
Limestone, hard............................................................ 19 2,098
7?........................................................................... 15 2, 113
Limestone.................................................................. 2 2,115
Gumbo..................................................................... 6 2,121
Limestone.................................................................. 6 2,127
? ........................................................................... 9 2,136
Limestone, hard ............................................................ 12 2,148
??.........................................................12 2,160
Limestone.................................................................. 47 2,207
7? ........................................................................... 8 2,215
Limestone, soft ............................................................. 5 2,220
Limestone................................................................. 5 2,225
Limestone, hard ............................................................ 10 2,235
7?........................................................................... 7 2,242
Limestone.................................................................. 8 2,250
Travis Peak sand:
??.......................................................................... 46 2,296
Water sand.............................................................. 14 2,310
"First Glen Rose water sand.............................................. 6 2,316
Sand.......................................................................8 2,324
Water sand....................................................... ........18 2,342
7?? ........................................................................... 55 2,, 47
"Second Glen Rose water sand............................................ 9 2,356
Carboniferous system:
Pennsylvanian series (?):
Red gumbo ................................................................ 5 2,361
?? .......................................................................... 339 2,700
Paluxy water bad; Travis Peak good.
GENERAL STRUCTURE.
The Cretaceous rocks dip rather steeply eastward (see fig. 2), so
that the Trinity sand at the base of the system, which comes to the
surface at Weatherford and Montague, lies more than 2,000 feet below
the surface at Dallas and Sherman and still deeper farther east. On
the other hand, the Carboniferous beds that outcrop at Henrietta,
Palo Pinto, and elsewhere dip westward, though not so abruptly as
the Cretaceous beds dip eastward, and in the western part of the State
lie several thousand feet below the surface. Whether or not the Car-
boniferous rocks dip to the west in the eastern part of this region also,
where they are deeply buried under the Cretaceous rocks, is not cer-
tainly known, and it is not certain even that they are present beneath
Dallas. Perhaps along the eastern border of the region, under Sher-
man and Rockwall, where they lie several thousand feet below the sur-
face, they dip to the east, so that their general structure in the State is
that of a broad anticline or upwarp. In any case the Cretaceous rocks
have a general terrace or broad anticlinal structure, for although their
dip is so steep in the northeastern quarter of Texas that they all
outcrop and their horizon is above the surface west of Bowie apnd
Weatherford, they come down again, as it were, farther west, in the
western part of the State. If the strata had no terrace or broad
anticlinal structure the beds near the base of the Cretaceous, which