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- W2124879543 abstract "Prepared by the Author Deep wells drilled in north central and west Texas during recent years have revealed a more complex structural history than might be expected from the exposed upper Pennsylvanian and Permian beds which display a gentle westward regional dip with minor structural irregularities. Illustrations presented included cross sections from Burnett to Upton, Palo Pinto to Brewster, Eastland to Edwards, and Mills to Uvalde counties, some based upon sea level and others upon either Pre-Carboniferous or Mid-Canyon horizons; also maps showing (1) the present position of the Pre-Barnett surface, (2) present position of the top of the Strawn and (3) position of the Pre-Barnett surface at the close of Strawn times, as revealed by the total thickness of beds between (1) and (2). This evidence discloses a major structural feature, the arch, trending northwest from the present Llano uplift, the latter being the uptilted southeast portion of this early larger structural feature which had its main development prior to Canyon times. The becomes largely obscured by regional westward tilting incident to the subsidence of the Permian basin area to the west and uplift to the east related no doubt to the southwest extension of the Ouachita Mountains. More subsurface information is needed to give a definite picture of the northwest of County, Texas, but as shown by Leverson this regional axis may continue across New Mexico and into northeast Arizona. Evidently this trend has been alternately active and dormant; Post-Carboniferous accentuation affecting notably the Trinity, the lower beds of the Upper Cretaceous and later deposits of Tertiary age. The term San Marcos has been used by Adkins for the southeast extension of this axis during Mesozoic and Tertiary times. The term Concho divide was first used for this extensive feature lying between thick Strawn deposits to the northeast and southwest in the Strawn and Kerr basins respectively, but retaining Bendian beds beneath upper Strawn beds along its axis. Later investigations show that in certain areas the Bend and even the Ellenburger were removed prior to middle Canyon times The term arch seems more appropriate now that some actual uplift and truncation have been recognized. The area of greatest truncation seems to be related to a transverse axis of Middle Strawn age, which trended northeast-southwest. This cross 1 Anzac Oil Corporation, Coleman, Texas. Levorson, A. I., Bull. Amer. Assoc. Pet. Geol., Vol. 17 (1933) Pp. 1107-32. Fig. 1. 3 Adkins, W. S., The Geology of Texas, Bull. 3232, p. 266. © TGS, 2006 Tulsa Geological Society Digest, Volume 3, 1934" @default.
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- W2124879543 date "1934-01-01" @default.
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- W2124879543 title "The Concho Arch" @default.
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