238 



Cp 



WICHITA 



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STRUCTURAL GEOLOGY OF NORTH AMERICA 



MOUNTAINS 

 -Cp. 



ANADARKO BASIN 



G' 



HORIZONTAL AND VERTICAL SCALE 



J MILES 



Fig. 15.2. Section through Wichita Mountains and Anadarko basin. Compiled from Taff (1904) and Millison 

 and Reed (1939). Os, Simpson group; Dv, Viola limestone; Osh, Silvan and Hunton formations; Mw, Wood- 

 ford formation. 



AMARILLO DISTRICT 



J' 



ANADARKO BASIN 



BUSH DOME 



JOHN RAY DOME 



MILES 



LEILA DOMfr 



HORIZONTAL SCALE 



Fig. 15.3. Sections J-J' and H-H' of Fig. 14.1 across the buried Amarillo Range. Taken from Cotner and 

 Crum, 1933. 



miles east-west across the Panhandle. See Fig. 15.1. The highest peaks 

 reached by the drill are about 1300 feet above sea level and 2000 feet 

 below the surface. Some of the granite peaks are overlain directly by 

 the Permian beds, but others are covered with the Pennsylvanian. See 

 cross sections, Fig. 15.3. En echelon faults bound some hills and help 

 produce ridges in en echelon arrangement. The Armillo Range and the 

 Wichitas are continuous as shown in Fig. 15.4. 



Las Animas Arch. The Amarillo Range probably extended to south- 

 eastern Colorado and northeastern New Mexico, where it joined other 

 ranges and an arch known as the Las Animas (Maher, 1946). See the 

 tectonic map of the Early Pennsylvanian and Fig. 15.5. The Precambrian 

 rocks may have been exposed above sea level in Early and Mid-Pennsyl- 

 vanian time along the Las Animas arch, but the thinning of the Pennsyl- 

 vanian and Permian strata over the arch is chiefly due to subsidence of 



