. Bulletin of the Geological Society of America. Geology. 708 J. H. GARDNER THE MID-CONTINENT OIL FIELDS nate structiu'es; probably the stresses from the two regions of maximum movement were to a notable extent relieved by the general rise of the intervening strata. This broad, low arch in central Texas is perhaps related in origin, as it is in size and form, to the Sabine uplift in north- ern Louisiana, which lies directly to the east. There is a well defined, broad structural basin between the two uplifts, in which lie the deposits of the Cretaceous and Tertiary systems. The Caddo oil field
. Bulletin of the Geological Society of America. Geology. 708 J. H. GARDNER THE MID-CONTINENT OIL FIELDS nate structiu'es; probably the stresses from the two regions of maximum movement were to a notable extent relieved by the general rise of the intervening strata. This broad, low arch in central Texas is perhaps related in origin, as it is in size and form, to the Sabine uplift in north- ern Louisiana, which lies directly to the east. There is a well defined, broad structural basin between the two uplifts, in which lie the deposits of the Cretaceous and Tertiary systems. The Caddo oil field is situated on the north side of the Sabine FiGDEE 7.—Structure Contour Map of Petrolia Oil and Gas Field, Texas From BuUetin 623, United States Geologcial Survey The oil in the Toyah field, in the extreme western portion of Texas, is found in the Delaware Mountain limestone member of the Permian, which series is covered by the Washita group of the Comanche series. C. A. Fisher has stated that the oil occurs on a monocline dipping 5 to 7 degrees eastward; hence it seems probable that this region lies beyond the effects of the earth movements above mentioned and is related to com- pressive stresses that were initiated farther to the west, and have shown a tendency to adjust themselves by an eastward tlirust along the west flank. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
