ECKEL.] 
GEORGIA. 
131 
i mile east of the village of Rockmart, Polk County, Ga. The Port- 
md cement manufactured here is made from a mixture of pure lime- 
itone and slate, both of which materials occur in the immediate vicinity 
)f the plant. 
Hard blue slates, which have been extensively quarried for struc- 
ural purposes, outcrop on the hills south of Rockmart. These slates 
re of Ordovician age and have been described as the "Rockmart 
lates" by Doctor Hayes. East of the town the surface rock is the 
'Chickamauga limestone," which here contains beds of pure nonmag- 
lesian limestone which have been quarried at several points in the 
icinity and burned into lime. 
The cement company purchased the property of the old Georgia 
Jlate Company, about one-half mile southwest of Rockmart, and car- 
ied on extensive operations with the diamond drill. The intention 
ras to quarry the slate, sell as slate the portions best suited for that 
se, and utilize the scrap and waste in the manufacture of cement, 
'he quarries from which the limestone is obtained are located one-half 
lile east of town, near the mill. The president of the cement corn- 
iany is Mr. W. F. Cowhan, who is also connected with the Penin- 
iilar Portland Cement Company, of Jackson, Mich., and the National 
Portland Cement Company, of Durham, Ontario. 
) Analyses of slate and limestone from the particular quarries which 
i is intended to work could not be obtained. Dr. J. W. Spencer, 
owever, quotes analyses of similar material from the vicinity, and 
hese will serve to indicate the character of the material which will be 
sed: 
Analyses of slate and limestone from Rockmart, Georgia. 
^lica (Si0 2 ) 
lumina ( A1 2 3 ) 
ron oxide (Fe 2 3 ) 
ime carbonate (CaC0 3 ) 
'lagnesium carbonate (MgC0 3 ) 
pda (Na 2 0) 
otash (K 2 0) 
Slate. 
61.66 
19.64 
7.54 
1.05 
1.27 
Limestone. 
1 
2 
2. 23 
} 
0.40 
94.37 
2.10 
95. 20 
2.17 
IDAHO. 
Small isolated areas of crystalline limestone (marble) occur in the 
restern portion of the State, but no extensive areas of limestone are 
nown to occur. 
