172 
CEMENT MATERIALS AND INDUSTRY. 
Analyses of limestones from Trenton group, Kentucky. a 
[R. Peter, analyst.] 
[bull. 243. 
Silica (SiOo) 
Alumina (Al 2 O a ) 
Iron oxide (Fe 2 3 ) 
Lime carbonate (CaC0. { ) 
Magnesium carbonate (MgC0 3 ) 
Alkalies ( K 2 0, Na 2 0) 
Sulphur trioxide (S0 3 ) 
1 
2 
'{ 
4 
5 
6 
7 
5.92 
2.38 
2.18 
2.08 
6.94 
1.88 
5. is 
1 3.28 
3.98 
2. 42 
.77 
.12 
2.70 
1:53 
85. 56 
91. 48 
92. 73 
95.38 
89.63 
90.72 
91.33 
3.57 
1.04 
.63 
1.51 
.88 
4.61 
.56 
.88 
.55 
.51 
.14 
.52 
.35 
.77 
.47 
.32 
.34 
.58 
.68 
n.d. 
.33 
1.58 
.38 
2.18 
95.68 94.75 
2.04 1. 
.24 .26 
.17 .30 
1. Clark County. 
2. Fayette County. 
3. Fayette County. 
4. Franklin County. 
5. Franklin County. 
From Kentucky Geol. Survey, Kept. A, pt. 2, pp. 123-124. 
6. Mercer County. 
7. Woodford County. 
8. Fayette County. 
9. Woodford County. 
The proposed Portland cement plant at Mentor will use shaly lime 
stone of Trenton age. This formation outcrops in a narrow stri 
along the Ohio River in Kenton and Campbell counties. Anothe 
proposed plant, below Ludlow, is to use the limestones (100 feet thick 
capping* the hills and the Eden shales beneath them. The slope o 
the hills, to a height of 250 feet or more, is composed of these shales 
The Trenton limestone along Ohio River runs higher in silica than i 
central Kentucky, but MgC0 3 generally is less than 2 per cent. 
CINCINNATI OR HUDSON GROUP. 
The series of shales and limestones which make up the Cincinnat 
or Hudson group in Kentucky occupy most of the north-central por 
tion of the State. The group consists of dark blue, argillaceous, 
thin-bedded limestones, with frequent interbedded shales. The lime J 
stones are usually of satisfactory composition for use as cemenj 
materials. The shales, however, are frequently sandy in the southern 
and western parts, but it is probable that even here shale beds oj 
satisfactory composition could be found on careful search. 
North of a line connecting Madison, Ind., and Maysville, Ky., th 
Cincinnati limestones are pure and the shales are calcareous and never 
arenaceous. In going southward from this line both the shales and 
the limestones, particularly in the middle part of the group, gradually 
grow 7 more and more sandy. Along the Cumberland River (i 
southern Kentucky) practical^ the whole group is represented by 
fine-grained sandstone. This has been called by Shaler the Cumber- 
land sandstone. 
a 
