SUBSURFACE CRYSTALLINES • 55 



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RED RIVER UPLIFT 



Powers lias also called attention to several granite Avells along Red 

 Eiver, in northern Texas and southern Oklahoma, in what he calls the 

 Red River nplift, extending eastward from the Petrolia oil field. The 

 presence of at least five wells, more or less in line, Avhich have reached 

 granite, in this region wonld lead to the assumption of the possibility of 

 the presence of a buried ridge at this place. Figure 3 shows the location 

 of the Nemaha and Amarillo Mountains and of numerous wells which 

 have touched granite. 



BURIED GRAXITE RIDGE IN SEW MEXICO 



John L. Rich has described a ^^buried granite mountain range under- 

 neath the western margin of the Great Plains, 30 to TO miles east of the 

 Front Range of the Rockies," ^^ reaching from Corona, 'New Mexico, 

 northeastward for a distance of nearly 300 miles. Mr. Rich bases his 

 conclusions on certain outcrops of igneous rocks as well as on granite in 

 several wells along the broad geanticline which separates the synclinal 

 basin east of the Front Range from the long monoclinal eastward dip of 

 the rocks across the plains. Regarding this matter, Mr. Rich says in a 

 letter dated December 4, ] 922 : 



"East of the Estancia Valley of New Mexico, for a distance of over 50 miles 

 north and south, there are outcrops of granite and other rocks of the base- 

 ment complex which represent the tops of a mountain range which was buried 

 under sediments of Permian age and later partly exhumed. The Hills of 

 Pedernal are monadnocks, near the northern end of the exposed portion of 

 this range. A few miles north of them, in the area covered by the Permian 

 sediments, several wells have encountered granite at shallow depths imme- 

 diately below the Permian rocks. At the Anton Chico well, township 11 north, 

 range 19 east, granite was found at about 2.000 feet immediately beneath the 

 Permian Redbeds. In a well drilled by the Continental Oil Company, in town- 

 ship PA north, range 33 east, on the broad anticlinal area east of the Raton 

 coal basin, granite was struck immediately below the Redbeds at about 2.500 

 feet. These facts, taken in connection with the general structure of the re- 

 gion, lend to the conclusion that an extensive mountain range of Pennsylva- 

 nian or early Permian age lies buried under the plains 30 to 70 miles east of 

 the pi-esent Eront Range of the Rocky Mountains." 



MISCELLANEOUS GRANITE WELLS 



From the map shown in figure 3, it Avill be noted that there are quite 

 a number of granite wells in the region west of the Ozarks. In Kansas, 

 six wells are reported east of the Nemaha Mountains. In northeastern 

 Oklahoma there are 15 granite wells; also six wells in Missouri and two 



