•kkl.] ALABAMA. 79 
on on the Repton Branch of the Louisville and Nashville Railroad, 
t this last-named locality the clay is present in sufficient quantity to 
e of value if the composition is suitable. 
DISTRIBUTION OF ST. STEPHENS LIMESTONE. 
The bluff at St. Stephens, a section of which has been given, is 
pical of the formation everywhere. Here the whole of the soft 
bitoidal limestone or " chimney rock" might be used, as the com- 
Dsition is uniform throughout. The overlying harder limestone has 
most the same composition, but it is less easily crushed and worked. 
may be quarried here from the surface down, as it is covered only 
a thin layer of residual clay. The characters of the limestone and 
the clay from here are sufficiently well shown by the subjoined 
alyses (36, 56). The character of the clay near St. Stephens at the 
ater level (No. 6 of the St. Stephens section) is shown in analysis 60. 
low St. Stephens there is deep water to Mobile, with the exception 
one bar, which may be removed without much trouble or expense. 
From Hobson's quarry, just above the Lower Salt Works Landing, 
>wn to Oven Bluff, a distance of 2 miles, the Orbitoides limestone or 
imney rock occurs at the base of bluffs of Tertiary age. 
At the quarry the hard limestone, which is being taken up for rip- 
p work, lies, as at St. Stephens, just above the soft chimney rock. 
ong the stretch of river above described this chimney lock is seen 
a bed 15 or 20 feet in thickness, just above the river bottom, and is 
sily accessible. As regards clay, three varieties have been examined, 
residual clay from over the limestone, a swamp-bottom cla} from the 
w grounds of Leather wood Creek, and clay from strata of the Grand 
ilf formation, which here overlies the St. Stephens limestone. The 
alyses of these clays have not yet been made. 
[The first shoal in the river above Mobile is a few miles above Oven 
|uff, so that from this place down there is a 9-foot channel at all sea- 
is, which will give to Oven Bluff a certain advantage over other 
alities in regard to transportation. The shoal mentioned is one 
lich can be removed, so that St. Stephens may be classed with Oven 
uff as regards transportation by water, except that the former is 
ne miles farther from the Gulf than the latter. 
Analyses by Doctor Mallett of other specimens of this chimney rock 
•■ given on page 83. No. 43 is a clay from Colonel Darrington\s 
ce, in the lower part of Clarke County, near Gainestown, and 44 
1 45 are from other localities in Clarke County near the rivers. 
oi It Glendon station, a few miles east of Jackson, there is an exposure 
the chimney rock close to the track. The rock here is about 20 feet 
ck, and the limestone is covered b} T a bed of red residual clay sim- 
r to that at St. Stephens and Oven Bluff'. The same chimney rock 
y be seen along the road between the station and Jackson, and no 
bt it occurs from Glendon up to Suggsville station, within conven- 
