270 
CEMENT MATERIALS AND INDUSTRY, 
[BULL. 243. 
CINCINNATI GROUP. 
This series may be separated into three well-marked divisions 
groups. The lower division, about 250 feet thick, consists almol 
entirely of shale; the middle division, 200-250 feet thick, contains 
numerous layers of limestone from 3 feet to 20 feet thick, the lower 
half constituting- the "Hill Quarry beds" at Cincinnati. The upper 
division (Richmond group) consists of numerous alternating beds of soft 
shale and limestone, with usually a heavy bed of shale at the base and top. 
Analyses of Trenton and Cincinnati limestones, Ohio. 
No. 
Silica (SiOo). 
23. 48 
10.80 
7.04 
12.00 
Alumina 
(A1 2 3 ); 
iron oxide 
(Fe 2 3 ). 
3.40 
1.40 
a 3. 78 
7.Q0 
Lime (CaO) 
39.93 
48.50 
49.28 
44.41 
Magnesia 
(MgO). 
0.91 
.54 
.98 
.44 
Carbon 
dioxide 
(C0 2 ); 
water. 
32. 35 
38.69 
38.72 
35. 36 
a Alumina, 2.48; iron oxide, 1.30. 
1. Limestone in Trenton series, river quarries, Cincinnati. Wormley, analyst. Geol. Survey Ohio, 
vol. 1, p. 374. 
2. Limestone in Trenton series, New Richmond. Wormlev, analvst. Geol. Svrvev, Ohio, vol. 1, 
p. 374. 
3. Limestone bed in Cincinnati series, Cincinnati. W. Simonson, analyst. 
4. Limestone in Trenton series, Point Pleasant. Wormlev, analvst. Geol. Survev, Ohio, vol. 1, 
p. 374. 
CLINTON LIMESTONES. 
The Clinton limestones, exposed and quarried at many points in the 
southwestern quarter of Ohio, are commonly fairly low in magnesia, ijl 
They range from 80 to 95 per cent in lime carbonate, rarely going above i 
the latter limit. Occasional beds are almost free from magnesium 
carbonate, while others may carry 10 per cent of this constituent. 
Analyses of Clinton limestones, Ohio. 
:l 
No. 
Silica (Si0 2 ). 
1.30 
2.00 
.07 
.80 
2.20 
.83 
.45 
1.64 
.70 
Alumina 
(A1 2 3 ); 
iron oxide 
(Fe 2 3 ). 
0.55 
1.60 
.40 
1.20 
2.00 
.29 
.26 
.36 
.41 
Lime car- 
bonate 
(CaC0 3 ). 
90. 03 
93.00 
95.60 
91.30 
84.50 
96.80 
95.03 
97.09 
97.14 
Magnesium 
carbonate 
(MgC0 3 ). 
5.71 
3.04 
3.93 
6.51 
11.16 
2.07 
4.35 
.82 
1.21 
1. Dayton, Montgomery County. 
2. Adams County. 
3. New Carlisle, Miami County. 
4. Smiths quarry, Ludlow Falls. 
5. McDonald's quarry, Xenia, Greene County. 
6. New Carlisle, Clarke County. 
7. Piqua, Greene County. 
8. 9. Osborn, Greene County. 
Analyses 1-5 by T. G. Wormlev, Rept. Geol. Survey Ohio, 1870, pp. 449-450; analyses 6-9 by N. W. Lord, 
Rept. Geol. Survey Ohio, vol. 6, pp. 728-729. 
