KENTUCKY. 
Analysts of limestones from Cincinnati group, Kentucky.^ 
[R. Peter, analyst.] 
173 
lica (Si0 2 ) 
Ilumina (A1 2 3 ) 
ton oxide (Fe 2 3 ) 
hue carbonate (CaC0 3 ) 
agnesium carbonate 
(MgC0 3 ) 
lkalies (K 2 0, Na 2 0) 
ilpbur trioxide (S0 3 ) 
1 
»j 
3 
4 
r> 
(i 
7 
8 
!> 
14. 44 
6. 38 
L3.98 
10. 12 
1 . 89 
3.68 
7. 18 
16.64 
1.72 
1 8.75 
2.20 
3. 91 
2.03 
.51 
1.19 
2.34 
2. is 
3. 58 
75. 14 
87. 98 
77. 36 
8. r ,. 20 
90.51 
92. 65 
88.90 
78. 68 
92. 92 
4.78 
1.72 
2.31 
1.24 
1.115 
1.54 
1.47 
1.57 
. 56 
.83 
. 34 
.49 
.79 
. 25 
.43 
.22 
. 35 
. 32 
.47 
.37 
2. 43 
.17 
. 18 
1.27 
.21 
.27 
.34 
III 
0.78 
l.ol 
96.24 
Mason County. 
Mason County. 
Mason County. 
Anderson County. 
Bourbon County. 
('.. Franklin County. 
7. Mercer'County. 
8. Nicholas County. 
9. Owen County. 
10. Woodford County, 
Excepting 5 and 10, which are of unusually pure limestones for 
leir respective localities, and 9, which is nearly normal for the north- 
rn part of the Cincinnati outcrop, all these analyses illustrate the 
icrease in silica southward, referred to above. In the central coun- 
es north of the Maysville-Madison line the limestones contain very 
ttle silica and agree closely with those in southwestern Ohio. 
MISSISSIPPIAN OR "LOWER CARBONIFEROUS" LIMESTONES. 
The Lower Carboniferous limestones are commonly low in magnesia; 
nd in most of the area covered by them in Kentucky they are also 
igh in lime carbonate. As the Tennessee-Kentucky State line is 
pproached, however, interbedded layers of chert become more and 
lore common, until the lower part of the series becomes too siliceous 
) be of much promise as a source of Portland-cement materials. 
The lower Mississippian sandstone, or Waverly sandstone, shown 
i the map, is limited to the east side of the Cincinnati axis and north 
f Jackson County, Ky. South of Jackson County and west of the 
lincinnati axis the equivalent strata consist, in central Kentucky, 
rincipally of shale, in which may occur considerable beds of siliceous 
mestone; in west Kentucky and middle Tennessee principally of sili- 
eous limestone, with more or less shale in the lower part (= Tulla- 
oma), passing southward into the Fort Payne chert. 
In the Mississippian group there are two horizons or beds, both 
olitic, that are important as future sources of Portland-cement mate- 
ial. The first, occurring at the base of the St. Louis and equivalent 
) the Spergen Hill (Bedford) limestone of Indiana, forms a generally 
road strip passing through Meade, Hardin, Larue, Barren, Warren, 
'odd, Christian, and Trigg counties. The second is the Ste. Gene- 
ieve limestone, which is limited to Christian, Caldwell, Crittenden, 
a From Kentucky Geol. Survey, pt. 2, p. 123. 
