ANALYTICAL ABSTRACTS. 867 



The Tertiary Geology of Southern Arkansas. By G. D. Harris. (An. 

 Rep. of the Geol. Surv. of Ark., 1892, Vol. II., pp. 207; 1 map.) 

 All the Tertiary deposits of Southern Arkansas are classed in the Eocene 

 series and subdivided into the Midway, Lignitic, Claiborne, and Jackson 

 stages, using the nomenclature of the neighboring states. These correspond, 

 in part, at least, with the Lafayette formation of McGee and the Orange 

 sands of Hilyard, but Professor Harris prefers, for reason given, not to use 

 these terms. Each of the stages is discussed in detail as to distribution, topog- 

 raphy, and organic remains. The oldest known Tertiary deposits in the 

 state are included in the Midway stage and contain a fauna similar to the 

 Midway limestone in Alabama. The Lignitic stage lacks molluscan remains, 

 but fossil leaves are abundant. Molluscan remains are not abundant in the 

 Claiborne stage, but are in the Jackson stage. The Tertiary-Cretaceous border 

 is changed in a number of places from Hill's map in 1888. The Cretaceous 

 is found farther to the northeast than formerly supposed. Seven plates of 

 typical fossils are given and thirty-four figures illustrating the stratigraphy of 

 the area. The purely economic features of the area will be discussed in a 

 future volume of the Survey publications. T. C. H. 



