14 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 9, 
mena in the country represented in the annexed diagram, and have 
Fig i. Bettis’ Hill. 
Claiborne. Z SS eee es 
= ge 
— — 
1. Sand, marl, &c. with numerous fossils. 
2. White or rotten limestone with Zeuglodon. \ ocene 
3. Orbitoidal or so-called nummulitic limestone. 
4, Overlying formation of sand and clay (Eocene ?). 
been obliged to give a considerable inclination to the strata, because 
in the distance of twelve or more miles between Claiborne and Bettis’. 
Hill, although the dip is not perceptible to the eye, the same beds are 
at the latter place more than twice as high above the Alabama river 
as at Claiborne. The lowest mass, above 100 feet thick, No. 1, which 
constitutes the lowest visible member of the Eocene series, comprises — 
marly beds with Ostrea selleformis, seen at the base of the cliff at 
Claiborne, and an argillaceous stratum with impressions of leaves, and 
sandy beds with marine shells, among which are found Cardita alta, 
C. planicosta, C. parva, Crassatella pretexta, Cytherea equorea, 
Oliva Alabamensis, Pleurotoma (several species), Solarium canalicu- 
latum, Crepidula lyrata, Endopachys alatum, Lonsdale, and 200 
other species. No. 2, about 50 feet thick, is the white or rotten 
limestone, which is sometimes soft and argillaceous, but m parts very 
compact and calcareous, and contains Flabellum cuneiforme, Lonsdale, 
Scutella Lyelli, Conrad, Lunulites, and. several shells, some peculiar, 
others common, to the formation below. Mr. Conrad has already 
described this section at Claiborne, and I hope soon to give a fuller 
notice of it with the observations which I made there in 1846. Of 
the limestone No. 2, only the lower portion is seen here, for it is cut 
off at the top of the bluff by the newer series of beds No. 4; but in 
many parts of Clarke County, as near Bettis’ Hill and near Clarks- 
ville, the same No. 2 is found more largely developed. It is charac- 
terized among other organic remains by a large Nautilus allied to WV. 
ziczac, and by the gigantic Zeuglodon of Owen. Near the junction of 
the mass with the incumbent orbitoidal limestone we find Spondylus 
dumosus (Plagiostoma dumosum, Morton), Pecten Poulsoni, Pecten 
perplanus, and Ostrea cretacea in abundance. 
No. 3 is a pure limestone, sometimes hard and full of Orbitoides 
Mantelli. At Bettis’ Hill the formation is about 70 feet thick, and 
the upper beds are composed of a cream-coloured soft stone which 
hardens on exposure, is not divided by lines of stratification, and is 
for the most. part made up of orbitoides of various sizes with oecasion- 
ally a lunulite and other small corals, and specimens of Pecten Pout- 
sont. 'The origin of this limestone, like that of our white chalk, the 
