CLARKE.] 
IGNEOUS AND CRYSTALLINE ROOKS. 
161 
Kallerudose. Consists chiefly of microcline in perthitic intergrowth 
with albite, quartz, and biotite. P. R. C. 606. 
C. Porphyritic granitite, south .side of Pikes Peak, ridge between 
Middle and North Beaver creeks. Lijparose. Contains microcline, 
perthite, orthoclase, oligoclase, quartz, biotite, and accessory apatite, 
fluorite, zircon, and magnetite. P. R. C. 602. 
D. Sheared granite, Currant Creek Canyon, north of Twelvemile 
Park. Magdeburgose. Contains perthitic microcline, quartz, musco- 
vite, and sericitic aggregates replacing plagioclase and a part of the 
microcline. P. R. C. 604. 
E. Granite, Currant Creek Canyon, north of Twelvemile Park. 
Omeose. Consists chiefly of perthitic microcline, quartz, greenish bio- 
tite, muscovite, and plagioclase altered to a sericitic mass. Also flakes 
of limonite. Accessory minerals rare. P. R. C. 603. 
F. Granitite, Middle Beaver Creek, south side of Pikes Peak. 
Lljjarose. Contains microcline, orthoclase, perthitic albite, oligoclase, 
abundant quartz, biotite, and a little accessory magnetite, fluorite, and 
zircon. P. R. C. 601. 
G. Granite-gneiss, north of Twin Creek. Kallerudose. Contains 
microcline, orthoclase, quartz, biotite, abundant fluorite, and a little 
sphene and apatite. P. R. C. 605. 
SiO,.. 
A1A- 
FeA 
FeO.. 
MgO. 
CaO.. 
Na 2 0. 
K 2 0.. 
H 2 above 110° 
Ti0 2 
PA 
MnO 
SrO 
BaO 
F._ 
C0 2 
LessO. 
77.03 
12.00 
.76 
.86 
.04 
.80 
3.21 
4.92 
.14 
.30 
.13 
trace 
trace 
none 
trace 
trace 
.36 
100. 55 
.15 
100. 40 
B. 
75. 92 
12.96 
.33 
1.40 
trace 
.15 
4.60 
4.15 
.16 
.32 
.05 
trace 
.04 
none 
trace 
trace 
.12 
.03 
100. 23 
.05 
100. 18 
C 
75.17 
12.66 
.23 
1.40 
.05 
.82 
2.88 
5.75 
.16 
.66 
.10 
.03 
trace 
trace? 
.03 
trace 
.31 
100. 26 
.13 
100. 13 
74.40 
14. 43 
.89 
.22 
.07 
.58 
1.76 
6.56 
.15 
.92 
.12 
.22 
trace 
none 
trace 
trace 
.04 
100. 36 
.02 
100. 34 
E. 
73.90 
13.65 
.28 
.42 
.14 
.23 
2.53 
7.99 
.16 
.33 
.07 
.05 
trace 
none 
trace 
trace 
none 
99. 75 
73.51 
13. 28 
.94 
.97 
.05 
1.11 
3.79 
5.22 
.16 
.62 
.18 
trace 
trace 
none 
trace 
trace 
.55 
100. 38 
.22 
100. 16 
66.90 
14. 86 
.93 
3.41 
.31 
1.23 
5. 56 
5. 02 
.16 
.31 
.43 
.12 
.15 
none 
.14 
.06 
1.00 
100.59 
.42 
100.17 
Bull. 228—04 11 
