148 



S. Poioers — Granite in Kansas. 



of petroleum producing anticlines which includes Billings, 

 Blackwell, Arkansas City, AiTgusta, and Eldorado. The prin- 

 cipal petroleum production in Oklahoma-Kansas comes from 

 an area of elliptical outline with the longer axis in a north-south 

 direction 75 miles east of the southern extension of the granite 

 axis. There is no doubt but that granite has been encountered 

 in wells in Kansas, and possibly in JS'ebraska, other than those 

 above listed, but this list will furnish some idea of the size of 

 the area underlain bj it. 



Anticlinal structure has determined tlie location of most of 

 the wells which have struck granite, vet two of the Zeandale 



Fig. 1. 



I:- 



O^ark 



Wichita 



■-■ 



Fig, 1. Outline map of Kansas, Oklahoma and portions of adjoining 

 states showing location of granite wells in Kansas ard Nebraska with 

 respect to fhe Ozark, Ouachita, Arbuckle, and Wichita mountains. 



wells and the Kelso well are not on anticlines. The large 

 anticline at Eldorado, south of the Burns granite well, shows 

 no granite at a depth of 3600 feet, nor does a well of the same 

 depth 2J- miles from Burns. Therefore, the surface of this 

 granite mass must have a relief of about 1300 feet in 6 miles. 

 The total lack of metamorphism in the Pennsylvanian rocks 

 around the granite knobs ]3roves that tie latter stood as islands 

 in the Pennsylvanian sea and were gradually buried beneath 

 the limestones and shales. In some of the wells red shale has 

 been noted immediately above the granite, while in others, 

 granite bowlders, sand, chert pebbles, and weathered granite 

 above the fresh rock show that the knobs suifered erosion in 

 Pennsylvanian time. In the first two Zeandale wells Professor 



