342 A. H. PURDUE 



of an overthrust fault passing into an anticline below, it bears 

 strong evidence of very recent tangential pressure having been 

 brought to bear upon the rocks of the region ; for it is incon- 

 ceivable that so small a flexure should break and produce a fault 

 with many feet of superimposed rock to be broken through. 

 The point is sufficiently elevated to suffer from slight erosion, 

 and as the rock is mainly shale and easily eroded, the very few 

 feet that have been removed since the faulting occurred could 

 not represent much time, as the geologist reckons time. 



A. H. Purdue. 

 University of Arkansas, 

 Fayetteville, Ark. 



