CRETACEOUS-EOCENE CONTACT 



433 



beveled off at the contact with the Eocene. This is particularly well 

 shown in the lens at the right of Fig. 2. 



Overlying the Eocene limestone, lower down the river than either 

 of the views shown in the figures, are black shaly clays, the Sucar- 

 nochee clays of the Alabama Survey, exposed in great thickness at 

 Black Bluff a few miles below Moscow Landing. 



Near the upper end of the Moscow Bluff both Cretaceous and 

 Eocene beds are faulted, the displacement being generally only a 



Fig. 3. — Bluff near Moscow Landing, Tombigbee River, Ala., showing two of 

 the sandstone lenses in erosion hollows in Cretaceous limestone. Both Cretaceous 

 and Eocene strata are faulted. The strata which directly overlie the beveled edges 

 of the sandstone lenses are Eocene. 



few feet, as may be seen in Fig. 3, the beds immediately above the 

 beveled-off sandstone lenses being Eocene. Along many of these 

 fault planes sheets of calcite, one or two inches in thickness, have 

 developed, with one surface after the manner of a slickenside. 



When this bluff was first visited by D. W. Langdon and the writer 

 in 1886, the small oyster was thought to be O. vomer, and the whole 

 section, with the exception of the black clays at the lower end of the 

 bluff, was referred to the Cretaceous; but on a visit to the locality 



