CLARKE.] 
IGNEOUS AND CRYSTALLINE ROOKS. 
10. CALAVERAS COUNTY. 
203 
Rocks collected by H. TV . Turner, and described in 14th Ann., p. 441 . 
Additional data supplied by Turner relative to analysis B. Analyses 
by W. F. Hillebrand, record No. 1432. 
A. Meta-dacite, If miles southeast of Milton. Contains quartz, 
feldspar, and hornblende. P. R. C. 777. 
B. Meta-dacite, 1| miles northeast of Milton. Contains feldspar, 
quartz, epidote, chlorite, and iron ore, in a groundmass made up prob- 
ably of feldspar and quartz. P. R. C. 752. 
C. Meta-andesite, H miles northward from Jenny Lind. Contains 
quartz, plagioclase, epidote, and chlorite derived from augite. 
Si0 2 .. 
A1 2 3 
Fe 2 3 
FeO. 
MgO 
CaO. 
Na 9 
H 2 Oat 100°.. 
H 2 above 100 c 
Ti0 2 
PA 
MnO 
SrO 
BaO 
CO, 
A. 
72.24 
13.84 
1.45 
1.86 
1.10 
3.40 
4.43 
.39 
.17 
.69 
.41 
.10 
.12 
trace 
.08 
100. 28 
B. 
71.19 
13.81 
1.45 
1.68 
.74 
2.87 
4.24 
1.82 
.15 
.92 
.35 
.08 
.07 
trace 
.16 
.82 
100. 35 
61.37 
15. 41 
3. 15 
3.89 
3.48 
4.42 
3.76 
.34 
.29 
2.70 
.60 
.08 
.47 
trace 
.08 
100. 04 
11. TUOLUMNE COUNTY. 
Rocks collected by H. W. Turner, and partly described in his papers 
n the 14th and 17th Annuals. The latites were named and described 
)y Ransome in Bull. 89. Some additional data have been furnished 
)y Turner. 
