IGNEOUS AND CRYSTALLINE ROCKS. 85 
G H I J. K L 
65.95 | 62.18 55. 13 
15.44 | 15.77 20. 27 
2. 02 1.83 1. 52 
1.60 2. 44 4. 29 
2. 65 3.55 1.80 
3.07 4,13 7.05 
4. 25 3. 92 4.31 
3. 87 3.91 2.84 
+26 - 30 14 
85 70 95 
+39 55 74 
25 - 32 
trace | trace 13 
10 -16 06 
35 + 43 11 
eam Dass trace trace 
psisietapeleecteate 26 
02) trace |........ 
04 04S | aneteieteisars 
100.11 | 100.23 | 100.00 
M. Minette, intrusive sheet, head of Sheep Creek. Monzonose. Chiefly biotite, 
augite, and orthoclase, with accessory apatite, plagioclase, quartz, and iron ore, 
and some secondary calcite, chlorite, and kaolin. Analysis by Hillebrand. P.R.C. 
1486. 
N. Monzonite, Yogo Peak. Monzonose. Described in Am. Jour. Sci., 3d ser., 
vol. 50, p. 473, and 4th ser., vol. 1, p. 356. Contains apatite, sphene, iron ore, pyr- 
oxene, hornblende, biotite, orthoclase, and oligoclase, and a little secondary kaolin. 
Analysis by Hillebrand. P. R. C. 1487. 
O. Monchiquite, dike on Big Baldy Mountain. Monchiquose. Contains much 
pyroxene, a few serpentinized olivines, iron ore, and apatite in a colorless base of 
analcite. Analysis by Hillebrand. P.R. C. 1488. 
P. Monchiquite, dike on Bandbox Mountain. Near wyomingose. Contains olivine, 
augite, biotite, analcite, and apatite, with traces of serpentine and chlorite. Analy- 
sis by Stokes. P. R. ©. 1489. 
Q. Shonkinite, Yogo Peak. Shonkinose. Described in Am. Jour. Sci., 3d ser., 
vol. 50, p.474. Chiefly augite and orthoclase, with a considerable amount of accessory 
biotite, iron ore, and andesine, less apatite and olivine, and a trace of kaolin. Analysis 
by Hillebrand. P. R. C. 1490. 
M N oO. B Q 
48. 39 48. 98 
11. 64 12. 29 
4.09 2.88 
3. 57 5.77 
12. 55 9.19 
7.64 9. 65 
4.14 woe 
BO essed nies seGokal as are eceente anseaeint decks n ge 3.24 4.96 
gO at NO secs we cease Hea ecens de Fee Foreses aeeeeeceees 28 - 26 
HO above 10 vvciseccicame niece sis dainmrenies sedans 2. 56 56 
HOR: sencremtia exper danveinslonstqnngar aisaigeieatesoae tiaataieteyaee DS -73 é 
Ps Oszexseeusss ore cnaaanswieeess yeusesmauoemraeaeeens ~ 45 98 
CVG OF So osvcsinain wince ncceinad sD ESRewas SeeRames Sarees seeaes .07 
1O soa otactacdicdew aainen Saidoeamisiein made cor Seen RS 
MNO oh wet aca ta tiededoiinnd wearin se se nebeecie sine ues 
S10 oc nceciscaeicis cea cemss.s scieseaise ani vieesee eee hese 
Ba Q oe eyes secrete ctaidienroaines Sammie wimaseamas ee SERS 
Tig Oh sivccccen oatseeretenaing, sears syiaseislaciwnisar setae Sains 
S Oss scons visswstnk enecaais Homer ee amber chien odie 
Cl os. esewiinsrunscoanusdiseorarceetet Seaseahias 
COs Sa edaciensieinsunpamisie esas Baas 
Ys ascoss 2s SRA GARONA MARR OUD mE BabeenMngacine ccm secede 
99. 90 99. 99 
15619—Bull. 419—10——7 
