14 Bulletin 9 206 



shell itself having bsen dissolved and entirel}^ removed, so as 

 to perclude the possibility of specific identification. A single 

 shark's tooth was obtained from this bed near Caledonia. Along 

 the edge of the Ohio, at Caledonia, there is a thin bed of lignite 

 to be seen, at extreme low water. It is onl}^ a few inches thick, 

 and forms the lowest stratum of Tertiary exposed in the vicinity. 



"At Ft: Massac, on the Ohio, just above Metropolis, the ferru- 

 ginous conglomerate already mentioned is from forty to fifty 

 feet in thickness. * * >!< Siliceous wood, in a fine state of 

 preservation has been found quite abundant in the Tertiary 

 beds in Pulaski and Alexander counties . " 



lyOUghridge gives the Caledonia secftion as follows : 



1. Brown loam 10 feet 



2. Silt or loam 10 feet 



3. Gravel 5 feet 



Dark sandy clay, indurated 20 feet 



Dark joint clay, weathering into a gra}^ shale 



and with cracks running S. 20° W 25 feet 



6. Greensand (glauconite) with hyaline sand ; also 



some black sand and clay 2 to 4 feet 



The lower moiety of this bluff is undoubtedly^ Eocene Tertiary, 

 but as remarked before its exact horizon is unknown. 



Kentucky. 



References: — Geol. Surv. Ky., vol. i, pp. 21-24, 18^6, — Owen. 

 Am. Jr. Sci., 2nd ser., vol. 27, jd^, i8^g, — Les- 

 guereux. Proc. Ac. Nat. Sci. Phila., 1886, p. 

 57, — Heilprin. Geol. Surv. Ky., Jackson' s Pur- 

 chase Region, pp. 41-^2, 1888, — Loughridge. 



Some of the bluffs along the Mississippi river, presumably 

 referable to the Lignitic stage of the Eocene were visited by 

 D. D. Owen as early as 1854, and described by him in 1856 as 

 "Quaternary beds" "quaternary lignite" etc. In 1859 Eesque- 

 reux identified the following species from the ' ' chalky banks 

 of the Mississippi River near Columbus, Ky : ' ' 



Quercus vire?is Michx., Castatiea nanaf Muhl., Ubnus alataf 

 Michx., Planera guielini Michx., P^'ijios integrijolia Ell., 



