,ARKE.] 
CARBONATE ROCKS. 
MARYLAND. 
305 
A. Dolomite-marble, Cockeysville. Analysis by E. A. Schneider, 
No. 1279. P. R. C. 117. 
B. An earlier sample of D. Analysis by J. E. Whitfield, record 
No. 827. P. R. C. 117. Described bv Diller in Bull. 150. 
Insoluble 
Si0 2 
A1A ---■ 
FeA ---■ 
FeO 
CaO 
MgO ... . 
H 2 
CO, 
5.5- 
40 
29. 08 
20.30 
44.2(5 
99.61 
.44 
1.22 
trace 
30. 73 
20. 87 
1.22 
45.85 
100. 33 
Bull. 228—04- 
-20 
