'KEL.] 
OHIO. 
273 
COAL MEASURES LIMESTONES. 
Limestone beds occur at intervals throughout the Coal Measures of 
>hio, as in the adjoining area of Pennsylvania. Most of these lime- 
:ones are of only local importance, and require no description here. 
>ne limestone formation, however — the Ferriferous or Vanport lime- 
x>ne — now furnishes cement material to four Portland cement plants 
1 Ohio and to one just across the border in Pennsylvania. It varies 
1 thickness from 8 to 16 feet or more, and is always low in magnesia, 
is usually also low in lime, ranging from 80 to 90 per cent in 
me carbonate. The following analyses are representative of its 
Dmposition : 
Analyses of the "Ferriferous" (Coal Measures) limestone, Ohio. 
No. 
Silica 
(Si0 2 ). 
Alumina 
(A1 2 3 ); 
iron oxide 
(Fe 2 3 ). 
Lime 
carbonate 
(CaC0 3 ). 
Magnesium 
carbonate 
(MgC0 3 ). 
0.60 
1.67 
.86 
1.72 
3.24 
2.90 
1. 00 
1.00 
5.40 
.56 
1.40 
1.36 
a 1. 66 
&8. 22 
2. 26 
2.71 
1.00 
6.80 
2.00 
cl.52 
97. 32 
95. 40 
96.18 
87.07 
93.21 
92. 02 
94. 20 
88.80 
88. 00 
97. 23 
0.45 
, 
1.38 
n. d. 
n.d. 
2. 19 
1.85 
. 76 
1.20 
, 
1.51 
1 
. 75 
a Alumina, 0.63; iron oxide, 1.03. & Alumina, 1.63; iron oxide, 6.59. 
c Alumina, 1.23; iron oxide, 0.29. 
.. Eifert, Lawrence County. Twentieth Ann. Rept. U. S. Geol. Survey, pt. 6 (continued), p. 432. 
I. Ironton, Lawrence County. N. W. Lord, analyst, Geol. Survey Ohio, vol. 5, p. 1109. 
>, 4. Ironton, Lawrence County. O D. Quick, analyst. 
). Lowellville, Mahoning County. N. W. Lord, analyst, Geol. Survey Ohio, vol. 5, p. 1109. 
i. Holmes County. N. YV. Lord, analyst, Geol. Survev Ohio vol 5, p. 1109. 
', 8, 9. Star Furnace. T. G. Wormier, analyst, Rept. Geol. Survey Ohio, 1870, p. 450. 
.0. Texas Hollow. W. S. Trueblood, analyst. 
Q UA TERN A R Y MARLS. 
Marl deposits occur at various points in Ohio, but apparently are 
)t so extensive as those in Indiana and Michigan. At present four 
ants are using marl as a Portland cement material. 
PORTLAND-CEMENT INDUSTRY. 
As noted above, Ohio at present ranks seventh as a producer of 
brtland cement. In 1904 eight Portland-cement plants were in oper- 
jion in the State. Four of these, located in eastern and southeastern 
hio, employed the Ferriferous limestone with shale as raw materials; 
Bull. 243—05 18 
