130 CEMENT MATERIALS AND INDUSTRY. [bull. 24 
CRETACEOUS AND TERTIARY LIMESTONES. 
DISTRIBUTION. 
The portion of Georgia lying south and southeast of a line draw 
through Knoxville to Columbus is occupied by clays, gravels, and so 
limestones of Tertiary and Cretaceous age. The limits of these form 
tions have never been accurately mapped, so that the distribution < 
the soft limestone beds can be stated only in a general way. Sever 
areas of the soft limestones (commonly called " marls" in geologic 
and agricultural reports) are known to occur. One of these areas 
the continuation of that described as the St. Stephens limestone i 
Alabama. A detailed description of the character of this limeston 
with numerous analyses from Alabama localities, will be found ( 
pages 77-83 of this bulletin. In Georgia this limestone occupi 
most of the counties of Decatur, Miller, Baker, Mitchell, Doughert 
and Lee. The only analysis of it from a Georgia locality is given 
No. 6 of the table below. Other limestone beds occur in the Cret 
ceous and Tertiary region, but little is known concerning the 
distribution. 
COMPOSITION. 
Such analyses as are available are presented in the following tab! 
They all show the presence of considerable percentages of silie 
alumina, and iron oxide, but are at the same time remarkably low 
magnesia. 
Analyses of Cretaceous and Tertiary limestones from Georgia. 
Silica (Si0 2 ) 
Alumina ( Al 2 O s ) 
Iron oxide (Fe 2 3 ) 
Lime (CaO) 
Magnesia (MgO) 
Carbon dioxide (C0 2 ) 
Water 
8.90 
.55 
3.22 
50. 14 
.05 
37. 05 
1.23 
6.30 
.41 
1.65 
49. 87 
.12 
39. 21 
1.63 
9.63 
.62 
4.31 
46.76 
.05 
36.52 
1.31 
13.86 
1.11 
2.08 
45.65 
.08 
34. 87 
1.19 
13.86 
1.76 
3.02 
43.67 
.04 
34.12 
1.45 
14. 
1. 
2. 
42. 
1. Reddick's quarry, Screven County. Reports Tenth Census, vol. 6, p^ 312. 
2. Washington County. Ibid. 
3. Shell Bluff, Burke County. Ibid. 
4. Houston County. Ibid. 
5. Near Montezuma, Macon County. Ibid. 
6. Near Albany, Dougherty County. Ibid. 
PORTLAND-CEMENT INDUSTRY IN GEORGIA. 
Only one Portland-cement plant is at present operating in Georg 
and this plant is of very recent construction. It is owned by t 
Southern States Portland Cement Company, and is located about h 
