BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 11, PP. 127-144, PLS. 15-17 MARCH 22, 1900 



GEOLOGY OF THE WICHITA MOUNTAINS 



BY H. FOSTER BAIN 



{Read before the Society December SO, 1899) 



CONTENTS 



Page 



Introduction , . . 127 



Previous work in the region . . 128 



Physiography ; 130 



Eocks present 133 



Crystalline rocks , 135 



Classification 135 



Raggedy Mountain gabbro 136 



Carrollton Mountain porphyry 136 



Quana granite 137 



Later erupti ves 138 



Sedimentaries 138 



Blue Creek series and Rainy Mountain limestone 138 



Geronimo series 140 



Red beds 141 



Cretaceous and Tertiary , 141 



Alluvium 141 



Age of mountains. 142 



Report on the fossils from the Wichita mountains by Stuart AVeller 142 



Introduction 



For a region of such geologic interest the Wichita Mountain belt has 

 been but little studied. Rising, as these mountains do, through the 

 latter sedimentaries of the prairie region midway between the Rocky 

 mountains and the crumpled paleozoics of western Arkansas, they afford 

 a key to many of the geological problems of the great plains. A detailed 

 study of the region is of the first importance, if we are ever to know the 

 geology of the plains region. While the present study is far from being 

 sufficiently detailed to answer many of these problems, it is believed 

 that important information worthy of permanent record has been ob- 

 tained. The survey was made within the present year, the month of 

 May being devoted to the task. 



XVIII— Bull. Geol. Soc. Am., Vol. 11, 1899 (127) 



