KEL. | 
CALIFORNIA. 
117 
Analysis of limestone from San Diego County, Cal. a 
lica (Si0 2 ) - 1.86 
Uumina ( A1 2 3 ) - 1- 10 
Jme carbonate (CaC< > 3 ) 94. 28 
iagnesium carbonate (MgC0 3 ) 1. 19 
Llkalies (K 2 0, Na,0) 1. 15 
OEANGE COUNTY. 
In Orange County a shell limestone is exposed at San Fernando, 
Bind outcrops on the mesa at various places, both toward Orange, 
'here there is a large exposure at the Los Alisos ranch, and toward 
San Juan. 
Analyses of shell limestone from Orange County, Cal. h 
Silica (Si0 2 ) 
Uumina ( Al 2 3 ) - II 
ron oxide (Fe 2 3 ) 
Jme carbonate (CaC0 3 ) 81. 36 
ffagnesium carbonate ( MgC0 3 ) .76 
Alkalies (K 2 0, Na 2 0) 1 . 32 
Lime sulphate (CaS( > 4 ) 42 
Water - 1. 25 
27.08 
65. 26 
1 . 22 
2.02 
1.02 
1.20 
L^S ANGELES COUNTY. 
On the flat land at the edge of the foothills near Mission San Fer- 
nando, Los Angeles County, a shell limestone of the following compo- 
sition occurs in extensive deposits: 
Analysis of limestone from Los Angeles County. Cat 
Silica (Si0 2 ) 19.72 
Alumina (A1 2 3 ) 1 o 97 
Iron oxide ( Fe 2 < ) 3 ) f 
Lime carbonate (CaC0 3 ) 72. 68 
Magnesium carbonate (MgC0 3 ) 1. 05 
Alkalies (K 2 0, Xa 2 0) 67 
Sulphur trioxide (S0 3 ) Trace. 
Water 1. 76 
"Ninth Ann. Rept. California State Mineralogist, p. 309. 
b Eighth Ann. Rept. California State Mineralogist, p. 880. 
