On the Delta and Alluvial Deposits of the Mississippi. 37 
sissippi, Alabama and Georgia, exhibits this superposition, as well 
M 3 2 1 a 2A 3 
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— t 
——_ 7, rh . = 
Petey! shits oh 8 teres Se: = 
ats ea SRST SS q 
! ye iy my . ar yy yg oe Saii=es5225523>>~ mein )/1181)/ 
Section (M to N) about 750 miles in length from west to east, from Lonisiana 
(on the west) through Jackson, Mississij pi, to Tuscaloosa,in Alabama, and thence, 
by Montgomery, to the Atlantic, near Dane, in Georgia. 
as that of the cretaceous strata on carboniferous rocks at Tusca- 
loosa. Mr. Lyell ascertained that.the huge fossil cetacean, named 
Zeuglodon, by Owen, is confined to the eocene deposits. In the 
Cretaceous strata, the remains of the mosasaurus, and other rep- 
tiles, occur without any cetacea. 
The coal-fields of Alabama were next alluded to; from 
which fossil plants have been procured, by Prof. Brumby and 
Mr. Lyell, of the genera Sphenopteris, Neuropteris, Calamites, 
Lepidodendron, Sigillaria, Stigmaria, and others, most of them 
identical in species, as determined by Mr. C. Bunbury, with 
fossils of Northumberland. This fact is the more worthy of 
notice, because the coal of Tuscaloosa—situated in lat. 33° 
1830, to explain the ancient geological changes of climate, by 
~ “1. The alluvium of the Mississippi.—2. Post-pliocene loam and sand, with 
recent shells and bones of extinct mammalia; the shells in this deposit, on the 
borders of the valley of the Mississippi, are re and fresh-water species, those 
, ; : ns 
t Marien, of marine species.—3. ene formatic i ppeeOa strata 
5. Carboniferous rocks.—6 ypogene or granite, gneiss, mica schist, d&c. 
to a. Louisiana.—A. Vicksburg, Mississippi.—B. Jackson.—C. Tuscaloosa, 
Alabama.—D. Montgomer ape 
a. Mississippi river,—b. Factuhehe hte river.—c. Flint river. 
