clarke.] COMPOSITE ANALYSES OF SEDIMENTARY ROCKS. 
21 
Si0 2 .. 
Ti0 2 . 
A1A- 
FeA- 
FeO . . 
MnO . 
CaO.. 
SrO . 
BaO . . 
Mg( ) . 
K,( ) . . 
Li./) 
H 2 OatllO°.... 
H,() above 110° 
PA 
CO, 
S 
so 3 
CI 
Carbon h 
55. 43 
.46 
13. 84 
4.00 
1.74 
trace 
5.96 
none 
.06 
2. 67 
2.67 
1.80 
trace 
2.11 
3. 45 
.20 
4.62 
100. 48 
60. 15 
.76 
16. 45 
4.04 
2.90 
trace 
1.41 
none 
.04 
2. 32 
3.60 
1.01 
trace 
.89 
3.82 
.15 
1.46 
58 
.88 
100. 46 
58. 38 
.65 
15. 47 
4. 03 
2.46 
trace 
3.12 
none 
.05 
2. 45 
3. 25 
1.31 
trace 
1.34 
:;. 68 
.17 
2.64 
si 
100. 46 
D. 
78. m 
. 25 
4.78 
1.08 
.30 
trace 
5.52 
trace 
.05 
1.17 
1.32 
.45 
trace 
.31 
<> 1 . 33 
.08 
5.04 
.07 
trace 
100. 41 
84.86 
.41 
5.96 
1.39 
.84 
trace 
1.05 
none 
.01 
.52 
1.16 
.76 
trace 
.27 
«1.47 
.06 
1.01 
.09 
trace 
99.86 
5. 19 
.06 
.81 
I /54 
fnndet. 
.05 
42.61 
none 
none 
7.90 
.33 
.05 
trace 
.21 
a. 56 
.04 
41.58 
.09 
.05 
.02 
100. 09 
•G. 
14.09 
.08 
1 . 75 
.77 
nndet. 
.03 
40.60 
none 
none 
4.49 
.58 
.62 
trace 
.30 
«. 88 
.42 
35. 58 
.07 
.07 
.01 
100. 34 
« Includes organic matter. 
t> Of organic origin. 
These analyses may be used for a variety of purposes. For example, 
they can help in tracing the change from an average igneous rock to 
an average sediment. They suggest something as to the characteristic 
features which distinguish a good building stone from other limestones 
and sandstones. They are applicable to the discussion of a variety of 
large theoretical problems, like that chosen by Professor Joly. These 
considerations alone justify their publication here. 
