k.ol I WEST VIRGINIA. 325 
Analyses of limestones (marbles) of Stevens Count)!, Wash. a 
8 
LOO 
.00 
.00 
53. 96 
1.60 
43.27 
Silica (Si(),) 
Alumina (A1 2 3 ) 
Iron oxide (Fe 2 3 ) . . . 
Lime (CaO) 
Magnesia (MgO) 
Carbon dioxide (C0 2 ) 
1 
•2 
:{ 
4 
5 
6 
7 
Or 87 
3.49 
0. 98 
o. 82 
2.61 
3. 12 
O. L3 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.24 
Tr. 
Tr. 
.00 
.93 
.(10 
55. 16 
51.54 
53. 96 
54. SI 
53. (is 
52. 04 
•".I.' »3 
.21 
1.11 
1.25 
1.70 
.76 
.67 
.54 
43. 77 
42. 46 
43. 76 
13.5(1 
42.89 
43. 22 
44.22 
1. White marble, Jefferson Marble Company quarries, 15 miles northwest of Colville. 
2. Pink marble, Jefferson Marble Company'quarries, 15 miles northwest of Colville. 
3. White marble, Keystone Marble Company quarries, 1G miles north of Colville. 
•1. Gray marble, Keystone Marble Company quarries, 16 miles north of Colville. 
5. White marble, Colville Marble Company quarries, 16 miles northeast of Colville. 
6. Dark-gray marble, Colville Marble Company quarries, 16 miles northeast of Colville. 
7. Light-gray marble, 2h miles northwest ol'Bossbury. 
8. Florentine Marble Company, Ryan. 
PORTIjA^D-CElVrEXT RESOURCES OE WEST VIRGINIA. 
PORTLAND-CEMENT MATERIALS. 
Four limestone horizons are worth considering" as possible sources 
of cement material in West Virginia. These are, in geological order: 
4. Coal Measures (Pennsylvania) limestones. 
3. Greenbrier (Mississippian) limestone. 
2. Lewiston (lower Helderberg) limestone. 
1. Ordovician limestones (Trenton, etc.). 
Of these the Greenbrier and the Ordovician limestones are by far 
the most important in this connection. All of these limestones are 
shown on the map (PI. XV). 
ORDOVICIAN LIMESTONES. 
Nonmagnesian limestones occur at several horizons in the Ordo- 
vician, the most important from the present point of view being of 
Trenton age. These correspond geologically to the cement rock of 
the Lehigh district of Pennsylvania. In West Virginia they are 
extensively developed in the Shenandoah Valley. 
At and near Martinsburg, Berkeley County, this pure limestone 
has been extensively quarried for flux. The developments at this 
point have been recently reported'^ on by Mr. G. W. Stose, as follows: 
At Martinsburg, W. Va., this limestone is exceptionally pure and very thick. It 
has been quarried there on a vast scale by the Standard Lime and Stone Company 
for use as flux in the iron furnaces about Pittsburg. 
a These analyses were obtained from the report by Professor Shedd on "The building and orna- 
mental stones of Washington," contained in the Annual Report of the Washington Geol. Survey for 
1902, pp. 3-163. This report contains detailed descriptions of the various quarry areas, and is there- 
fore valuable for reference in the present connection. 
6 Bull. U.-S. Geol. Survey No. 225, pp. 616-517. 
