quently and continuously, until, at Port Hudson, they become 
predominant. 
The exposure at Port Hudson, previously examined in part 
by Bartram, Carpenter and Lyell, is about three miles in ex- 
tent, from the mouth of Sandy Creek above the town, to Fon- 
tania Landing, 13 miles below. Its lower half is washed, and 
continually encroached upon, by the river ; its upper portion 
1s how inland of an extensive sandbar. The strata are disposed 
horizontally or basin fashion, and vary a good deal both in thick- 
ness and materials, as shown in the subjoined profiles, situated 
about a mile apart ; the correspondence of strata is ascertained 
by actual tracing of the stratification lines, 
Near Sawmill, Port Hudson. No. | Midwaybetw’n Port Hudson & Fontania, 
Yellow surface Loam. 4—6 ft.| 6 |Yellow Loam, sandy below; S—10 ft. 
White and yellow hardpan, _-_-_-_- 18 ft. 
Yellow Hardpan,.._._._._- 25 ft. 
5 |Orange andyellow sand, sometimes fer-| 
Tuginous sandstone, irregularly stra- 
tified, 8—15 ft. 
\Heavy greenish Clay,........ 7 ft.| 4 |Heavy, greenish or bluish Clay, _.7 ft. 
ae ee ee 
it 
3 | White indurate silt or hardpan, 18 ft. 
yo wees ew eee 
Heavy green clay, with porous lear 
Heavy, greenish or bluish, massy ous concretions above, ferruginous 
y sini 
cla, , Similar to No. 4; 25 ft. visible. ones below; some sticks and impres- 
sions of leaves, 2.422... 2 30 ft. 
ae _Sions of leaves, -....--------30 ft. 
Brown muck, te cypress 
White or bine clay, ) S™™Ps, 3-4ft. 
stump-stratum No. 1 was visible to the thickness of 10 ft. 
one another, also the remnants of many successive falls of leaves 
and overflows. The wood is in a good state of preservation ; 
oe, genni trunks to be seen at present. ae 
_, *he main clay deposit, No. 2, varies but little in general 
character ; although very solid, its tendency to cleave into pris- 
a forms renders it very liable to ve” into the river. 
end, Contains strings of calcareous nodules, on stra 
Tines eight to twelve inches apart. No 
eaves, 
rs at Sid eMC aie a ere ie ph er ae Site e Bar eon a ed Ne WG es 
“ait eT) Re MRS 
