o58 C. X. GOULD CRYSTALLINE ROCKS OF THE PLAINS 



A number of ^rells in the Waco region, in central Texas, reported to 

 have reached a schistose material are purposely omitted from the list for 

 the reason that at this writing there is some difference of opinion as to 

 whether or not these wells actually passed through the sediments. 



JSfeiD Mexico 



Depth, feet 



Section 30, townsliip 11 north, range 19 east 2,000 Guadaloupe Co. 



6, township 31 north, range 33 east 2,725 Union County. 



21, township 11 soutli, range 18 east 2,000 Lincoln County. 



25, township 2 north, range 20 east 2,560 Guadaloupe Co. 



. . , township 1 south, range 19 east 2,000 Lincoln Countj'. 



8, township 8 north, range 13 east 1,110-1,176 Torrance County. 



32, township 20 north, range 31 east 2,400 Union County. 



. . , township 13 north, range 11 east 2,450 Santa Fe County. 



Discussion 



. Mr. E. S. KxAPPEX : It is interesting to note tliat the so-called "Gran- 

 ite Eidge" of Kansas does not consist of one granitic intrusion but is 

 rather a crystalline complex such as is common in other Pre-Cambrian 

 areas of North x^merica. Cuttings from wells at Winchester, Seneca, 

 and Frankfort (Kansas) have revealed the presence of several types of 

 igneous rocks, ranging from acid pegmatites to gabbros, and of rocks 

 which are. in part certainly metamorphosed sediments. In addition to 

 gneiss and schist, which are of doubtful origin, crystalline limestone has 

 been penetrated in the Seneca and Winchester wells. 



Refebexces 



1. J. A. Udden, C. L. Baker, and Emil Bose : Review of the geology of Texas. 



Bulletin of the University of Texas, 1916, number 44 (revised 1919), 

 page 109. 



2. Willis T. Lee : The Raton mesas of New Mexico and Colorado. The Geo- 



graphical Review, volume II, number 3, July, 1921, pages 384-397. 



3. J. C. Branner and R. N. Brackett : Peridotite of Pike County, Arkansas. 



American Journal of Science, July, 1889, pages 50-59. 

 J. Francis Williams : Igneous rocks of Arkansas. Arkansas Geological 

 Survey, volume II, pages 378-391. 



4. Robert T. Hill and T. Waylaxd Vaughax : Austin Folio, United States 



Geological Survey. 



o. T. Waylaxd Vaughan : Uvalde Folio, United States Geological survey, 

 page 5. 



6. James F. Kemp : After-effects of igneous intrusives. Bulletin of the Geo- 

 logical Society of America, volume 33, March 31, 1922, pages 233, 234. 



