434 EUGENE ALLEN SMITH 



made in 1908 by a party of state geologists and others on a trip 

 down the river from Tuscaloosa to Jackson in Clarke County, several 

 specimens of Enclimatoceras Ulrichi were found in the upper lime- 

 stone bed, and the small oyster was recognized as O. Pulaskensis, 

 thus establishing the horizon as that of the Midway. 



It has been suggested that the glauconitic sandstone is a basal 

 Eocene bed, but its local character and the unconformity between 

 it and the Midway everywhere would militate against this view. 

 The unconformity, in places, between it and the Cretaceous below, 

 is, however, equally pronounced. 



There are many things about these sandstone lenses which are 

 not easily understood. . Thus, to all appearance these beds after 

 their deposition have been tilted and their edges beveled by erosion, 

 and this in one or two cases without any perceptible disturbance of 

 the Cretaceous limestone upon which they rest. This is shown by 

 the fact that the bed of phosphatic shell casts, which presumably 

 marks a stratification plane in this limestone, in approximately hori- 

 zontal position, in some cases, maintains this attitude to the very 

 edge of the erosion hollow containing the shell conglomerate and 

 sandstone; while in other cases this phosphatic shell bed bends down 

 below these hollows, as though they were produced by plication and 

 as though the stratification of the Cretaceous limestone were con- 

 formable to that of the shell conglomerate and sandstone. 



