eckel.] ALABAMA. 
Analyses of clays — Paleozoic and lower Cretaceous — Continued. 
71 
Number. 
24 
25 
26 
27 
28 
29 
30 
31 
32 
Silica 
(SiOo). 
63.27 
67.10 
65.58 
68.10 
65.49 
70.00 
67.50 
66.45 
64.90 
Alumina 
(AI0O3). 
19.68 
19. 37 
19. 23 
21.89 
24.84 
21.31 
19.84 
18.53 
25. 25 
Iron oxide 
(FeaO.,). 
3.52 
2. 88 
4.48 
2.01 
Tr. 
2.88 
6. 15 
?. W 
Lime 
(CaO). 
1.30 
Tr. 
Tr. 
.80 
1.26 
.20 
.12 
1.50 
Tr. 
Magnesia 
(MgO). 
Tr. 
0.73 
Tr. 
.28 
Tr. 
Tr. 
.10 
1.25 
Tr. 
Alkalies 
(K.,0, 
Na«0). 
1 . 20 
.67 
.40 
Tr. 
Tr. 
Tr. 
Ignition. 
9.80 
7.79 
6. 90 
5. 75 
7.80 
6.85 
7. 65 
9.46 
8.90 
Total. 
98.77 
98.54 
96.19 
99.23 
99.39 
101. 24 
101. 36 
99.59 
99. 05 
Coal Measures. 
Mississippian. 
Ordovician and 
Cambrian. 
Lower Cretace- 
ous (Tusca- 
loosa). 
Dark-yellow shale from Coal Measures, \V. H. Graves, near Birmingham, Jeffer- 
son County. 
Light-gray shale from same locality. 
5. Fire clay, near Valley Head, Dekalb County. 
China clay, Eureka mines, Dekalb County. 
China clay, Rock Run, Cherokee County (Dykes ore bank). 
Fire clay, Rock Run, Cherokee County. 
Pottery clay, Rock Run, Cherokee County. 
China clay, J. R. Hughes, Gadsden, Etowah County. 
Stoneware clay, Blount County. 
Stevens, fire clay, Oxanna, Calhoun County; probably too much free sand. 
Stoneware clay, Coosada, Elmore County. 
Pottery clay, McLean's, near Edgewood, Elmore County. 
Stoneware clay, Chalk Bluff, Elmore County. 
Fire clay, Woodstock, Bibb County. 
Fire clay, Bibbville, Bibb County. 
Fire clay, Hulls Station, Alabama Great Southern Railroad, Tuscaloosa County. 
Pottery clay, H. H.Cribbs, Alabama Great Southern Railroad, Tuscaloosa County. 
Pottery clay, J. C. Bean, Mobile and Ohio Railroad, Tuscaloosa County. 
Fire clay, J. C. Bean, Mobile and Ohio Railroad, Tuscaloosa County. 
Stoneware clay, Roberts's mill, Pickens County. 
Pottery clay, Cribb's place, Lamar County. 
Stoneware clay, H. Wiggins, Fayette County. 
26. Pottery clay, W. Doty, Fayette County. 
Blue clay, railroad cut near Glen Allen, Marion County. 
China clay, Briggs Frederick, Marion County. 
Pottery clay, 10 miles southwest of Hamilton, Marion County. 
Pottery clay, Thomas Rollins, Franklin County. 
Pottery clay, J. W. Williams, Pegram, Colbert County. 
China clay, Pegram, Colbert County. 
CENTRAL AND SOUTHERN ALABAMA. 
The raw materials suitable for the manufacture of Portland cement 
which occur in central and southern Alabama are argillaceous lime- 
stones, pure limestones, and clays. 
The limestones valuable as cement materials occur mainly at two 
horizons, viz, in the Selma chalk or Rotten limestone of the Cretaceous, 
and in the St. Stephens formation of the Tertiary. The clays available 
(are the residual clays derived from the decomposition of these two 
limestone formations, the stratified clays of the Grand Gulf formation, 
and the alluvial clays occurring in the river and creek bottoms. It is 
possible that later investigation may show that some of the other 
stratified clays of the Cretaceous and Tertiary formations are suitable 
for cement making, and this is especially likely to be the case with 
the clays of the lowermost Cretaceous or Tuscaloosa formation. 
