CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
77 
F. Green schist, sec. 34, T. 48 N.. R. 27 W., near center of section. 
Contains plagioclase, chlorite, and quartz. Analysis l>v George Stei- 
ger, record No. 1447. P. R. C. 986. 
G. Sericite-schist associated with the preceding. Mainly sericite 
and quartz. Analysis by Steiger, No. 1447. P. R. C. 985. 
H. Dark-gray, foliated schist, SE. corner of sec. 30, T. 47 N., R. 
30 W. Contains quartz, plagioclase, orthoclase, and biotite. Analysis 
by Steiger, No. 1525. P. R. C. 991. 
1. Schistose gneiss, NW. £ of sec. 35, T. 47 N., R. 26 W. Contains 
quartz, kaolin, sericite, plagioclase, chlorite, magnetite, and apatite. 
Analysis by Steiger, No. 1525. 
J. Novaculite from Marquette. Described by Williams in Bull. 62. 
Contains quartz and sericite. Analysis by W. F. Hillebrand, record 
No. 759. 
Si0 2 
A1A 
Fe 2 : , 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oatl00°.... 
H 2 above 100° 
TiO, 
P 2 5 
MnO 
Li 2 
co 2 
61.35 
16. 45 
.94 
4.20 
3. 12 
3. 46 
5.24 
1.05 
.10 
2.51 
.26 
.18 
1.98 
100. 84 
G. 
70. 76 
14. 83 
1.46 
3.09 
1. 99 
.36 
.47 
3. 50 
.09 
2. 70 
. 33 
.26 
H. 
99. 84 
63.50 
17.89 
1.12 
5. 38 
1.22 
2.34 
2.55 
2. 43 
.22 
2. 04 
.62 
.19 
trace 
99.50 
82. 38 
11. 32 
.97 
.26 
.17 
.22 
.59 
1.04 
.18 
2.33 
.14 
.09 
none 
99. 69 
76. 99 
13. 92 
.45 
.77 
1. 12 
.32 
. 56 
3. 65 
2.35 
trace 
trace 
trace 
100. 13 
