1 6 Bulletin 9 308 



lyoughridge establishes a basal Eocene stage in Kentuckj' 

 under the name of "Hickman group;" which represents to 

 some extent the northern extension of the Midway of Mississippi 

 and Tennessee. The above quotations are taken from what he 

 terms the " Lignitic group," concerning which he makes the 

 following general statement : ' ' This, the next lowest division of 

 the Eocene, embraces the two groups of Safford's Tennessee, 

 viz : Porter's creek and bluff lignite, which he supposed were 

 separated by his Eagrange beds, but which are in reality one 

 and the same bed, as shown in the bluff of the Ohio on the 

 Illinois shore at Caledonia, as well as by the continuity of the 

 belt on the east, north and west of the Purchase region." 



By consulting Bulletin Amer. Paleont. vol. i, p. 136 it will 

 be seen that the Porter's creek group is for the most part 

 Midway. 



Tennessee. 



References : — Amer. Jr. Sci., 2d ser., vol. 2y, 363-36^, '5p, 

 — Lesquereux. A7ner. Jr. Sci., 2d ser., vol. j/, 



pp. 368-3^0, '64., — Safford. Geology oj Ten- 

 nessee, i86p. — Safford. Anu'l Rep' t Geol. Surv. 

 Arkansas, ^8g, vol. 2, p. 28, 'pi, — Call. 

 Bull. State Board oJ Health ( Tenn.^ vol. v. No. 7, 



pp . p8-io6 , ' po, — Safford. 



The first important article on the Neozoic of Tennessee was 

 by James M. Safford, entitled " On the Cretaceous and superior 

 formations of West Tennessee. ' ' In his generalized sedlion of 

 these beds the terms he used to designate the different Tertiary 

 formations are as follows : 



" 6. Bluff Lignite, ( provisional). Tertiary? 

 5. Orange sand or LaGrange Group, Tertiary. 

 4. Porter's Creek Group, ( provisional). Tertiary ? " 



He then very correcftly correlates this Porter's creek group 

 with the " Flatwoods " region of northern Mississippi, i.e. the 

 upper part of the Midway stage as now understood. Of his Ea- 

 Grange group he says : It occupies a belt about forty miles wide, 

 which runs in a north north-easterly direction through nearly 

 the central portion of this division of the State. As seen in bluffs, 



