242 
CEMENT MATERIALS AND INDUSTRY. 
I BULL. 2« 
Doctor Cook also gives the following analyses of specimens, the 
exact geologic horizon of which can not be determined from the recoj 
Analyses of Silurian limestones. 
Silica (Si0 8 ) 
Alumina and iron oxide (A1 2 3 and Fe 2 3 
Lime (CaO) 
Magnesia (MgO ) 
Carbon dioxide (C0 2 ) 
1 
2 
9.80 
8.70 
2. 10 
1.50 
48. 88 
49.67 
.35 
.69 
38. 90 
40. 00 
36.7 
1. Limestone from John Schooley's farm, near Peters Valley 
•J. Limestone from farm of Joshua Cole, Montague. 
3. Limestone from farm of Calvin Decker, Wallpeck Ridge. 
WHITE MARL DEPOSITS. 
Iii addition to the limestones described in the previous part of fl fli 
report, there are in Sussex and Warren counties shell-marl deposi iH 
often of considerable extent, some of which may be sufficiently pi 1 1 
to be used for Portland cement in combination with clay. No recj i is 
study of these deposits has been made, but the following data, fi j 1 
the earlier reports of the New Jersey Geological Survey, particull i is 
from the annual report of 1877, may be of value in this connectitt 
These partial analyses were published in 1877: 
Analyses of New Jersey marls. 
Calcium 
carbon- 
(cico,). 
Magne- 
sium car- 
bonate 
(MgC0 3 ). 
Sand 
and 
clay. 
Water, 
vegeta- 
ble mate- 
rial, etc. 
1... 
98. 33 

0. 90 
0.67 
2... 
88. 86 

9.96 
2. 16 
3... 
97. 73 
.60 
1.59 
4... 
95. 34 
2. 18 
.98 
1.50 
5... 
96. 32 
1.57 
1.16 
.96 
6... 
92. 25 
2. 98 
1.56 
3.21 
7... 
89.87 
2. 29 
.97 
6.87 
8... 
96.54 
1.47 
2.05 
0.00 
9... 
84. 52 
3.76 
8. 46 
5. 26 
Description. 
White, pulverulent; 
no vegetable matter. 
Precipitate from water. 
White, dense, fine 
Surface marl, white, 
solid, line. 
Drab white, fine and 
with shells. 
White, pure, some 
grass roots. 
Ash .colored, many 
shells, light. 
White, very fine, 
medium density. 
Surface marl 
Location. 
And o ver , Susi i le 
County. 
ill 
Peters Valley, Sua 
County. 
Shiloh, Warff 
County. 
Do. 
)d: 
Hunt's mill, Sus 
County. 
Marksboro, WariifD] 
County. 
Hope, Warren Coui I 
Newton, Suss 
County. 
Do. 
