468 



SAMUEL WEIDMAN 



The Arbuckle and the Wichita areas are the remnants of ancient 

 mountain ranges that were elevated during Carboniferous time. 

 Their uplift began soon after the Mississippian and apparently- 

 continued throughout a large part of the Pennsylvanian and into 

 the early Permian. 



It is obvious that in the general degradation of the Arbuckle 

 and the Wichita Mountain areas the agents of erosion would first 

 attack the youngest rocks of the uplifted areas and then in succession 

 each of the older formations in the reverse order of their deposition. 

 The Paleozoic sedimentaries, beginning with the Mississippian, were 



Fig. I. — Sketch map of the Arbuckle Mountains 



first removed before the underlying pre-Cambrian igneous rocks 

 were exposed to erosion. In both areas, therefore, there are con- 

 glomerates of predominating Paleozoic limestone boulders formed 

 in early Pennsylvanian times followed by conglomerates containing 

 abundant pre-Cambrian igneous boulders of much later Pennsyl- 

 vanian and Permian age. 



In the Arbuckles, as now exposed, the conglomerates are largely 

 of Paleozoic limestone boulders, and only some of the very latest 

 conglomerates contain the boulders of the pre-Cambrian igneous 

 rocks. On the other hand, in the Wichitas the pre-Cambrian igne- 

 ous boulder conglomerates are the most abundant, and some of 



