CRET ^CEOTJS I tMESTONE, 
S • n of aril at Livingston, Sumter County, Ala. 
:: 
l Kiploy: 
Sandy loam 
: .... 
White quicksand 
Selma chalk: 
Soft my shells and pyrite nodules... 
White limestone, harder, few shells or pyrite nodules. 
I blue limestone, no shells or nodules 
Bluish-white limestone, less hard, no shells or nodules 
White limestone, very hard 
Light-blue limestone, softer 
Bluish-brown rock, small shells, some sand 
Bard white limestone 
Soft reddish-brown rock 
Soft deep-blue rock 
Brownish-blue rock, moderately soft 
Hani, gritty Mue rock 
Park-bluish rock, soft 
Soft whitish limestone 
Kutaw sands: 
Hard sandstone 
Sand 
Sand rock 
Coarse greensand 
Sandstone 
Greensand 
San. 1st one 
1 I 
Flint rock 
Very fine greensand 
■ >ss 
Depth. 
Feet 
Fee*. 
I 
12 
1 - is 
■ 
- 
200 
: 
250 
3 
- 
- 
58 
3 
105 
- 
: 
590 
v 
612 690 
690 
690$ 700 
700 
ti 
950 
10 
966 
I 
966 967 
: ^ 
967 1,005 
; 
1,005 
1,007 
- 
» 
1 . 052 
I 
1,052 1,053 
9 
1,053 1,062 
Description oflocaliti s. During L904 the Selma chalk was carefully mapped throughout 
the Tombigbee River basin. The result o\' this mapping is shown in PI. 1. In the follow 
ing pages descriptions will he given of the various localities visited during this work. Sam- 
ples were taken from all of these localities, and many of these samples have been anal} sed, 
the results being given below. The descriptions are given in order, going up Tombigbee 
River from the Alabama-Mississippi line. 
Ai the big elbow bend in Oaknoxubee River, one-fourth mile below the wagon bridge at 
Macon, the river has formed on its south side a bluff 75 feet high. The entire cliff is made up 
of the Selma chalk. It iaa solid mass o( white chalk, uonfossiliferous, ami apparently without 
bedding planes, hut viewed at a distance the stratification of the material is shown by the 
unequal hardness o( the strata, causing some to weather mote rapidly than others. There 
is a marked clip to the south. All the smaller streams flowing into the Oaknoxubee have 
channeled their beds into the pure white limestone. A sample was collected from the bluff 
on Oaknoxubee River and has been analyzed in the laboratory of the United States Geo- 
logical Survey, as follows: 
Analysis of Selma limestone from bluff near Macon. 
[Hv \\ S. M( Neil.] 
SQica (SiOj) 9 09 
Alumina | \U >. ; > 1 _ ._ 
Iron oxide I !•>...< \- I 
Lime carbonate (CaC< > 3 > 80-99 
Water 1.08 
