IGNEOUS AND CRYSTALLINE ROCKS. 67 
E. Augite andesite, Dike Mountain. Shoshonose. Contains augite, plagioclase, 
serpentinized olivine, magnetite, and apatite. 
F. Trachyte andesite, Dike Mountain. Akerose. Contains plagioclase, ortho- 
clase, chlorite, apatite, and magnetite. Very little augite. 
G. Biotite trachyte, Dike Mountain. Nordmarkose. Contains plagioclase, ortho- 
clase, biotite, magnetite, and chlorite. 
H. Biotite trachyte, Dike Mountain. Pulaskose. Contains orthoclase, plagioclase, 
biotite, and magnetite. 
E F G. It 
BU O gies crs cnteecnpss car skjcimsaiee Bs aomBicduiiie vs 1 Rapchationis ome teen eee aula ce NE 51.17 | 52.47 | 63.24 57.73 
A909 - crciosvarinaivor ncaa saceciencte 16.14 | 18.23 | 17.98 18.93 
BOs O go. sisconcreeicinide sacateicicion oh Getwhletasins Gd dasebanwa exioaneinaisias. wee mevaie 4.11 3.31 2.67 1.97 
FeO. 4,48 3.85 85 1.92 
MgO 4.82 2.85 63 OL 
CaO 7.72 4. 56 93 2.78 
Kk20 
Fig sat110P. oa sbievanct yee Soca Gad ob. ened nude boo Ge anemia escapee -63 68 +37 22 
HaO above 110°... 1,-2.2... 2.2 eee eee eee eee cece eee eee 2.24 2.03 - 80 2.93 
Osissse cess sesameeaess PenRatES 75 LHe Esscveseeeterers Sea MSEC I AS CEN 1.01 97 38 33 
ie, aet i adanada hae ay wach casbaneaga Sowa aeea eset ER MsLEOe SA ARETE 48 64 22 25 
none 02 | trace trace 
trace | trace | none trace 
04 03 01 01 
01 | trace} none} trace? 
4 senesex 21 “lS 04 
feasts Witz ieceags Seis Puabehsy ic sz Sa eekiaseeheadan onetpinee e Saisie See ESE BOIS 10 i 03 09 
eee 20 23 #25 16 
id Sgategta trace | trace | trace trace 
ere none 1.01 none 26 
s piawtacieid ssieeh asia aS ceGass Ese ao ERKATET PEVeCaamalils wobansedor 05 04 | trace 02 
4. ABSAROKITE-SHOSHONITE-BANAKITE SERIES. 
Rocks from the Yellowstone Park and the Absaroka Range, described in Mon. 
XXXII, pt. 2, and also by Iddings in Jour. Geology, vol. 3, pp. 938, 943, 947. The 
rock A, from Ishawooa Canyon, is also described by Hague in Am. Jour. Sci., 3d ser., 
vol. 38, p. 46. 
A. Leucite absarokite, Ishawooa Canyon, Wyoming. Camptonose. Bowlder. 
Contains olivine and augite in a groundmass of orthoclase and leucite. Accessory 
minerals, magnetite, apatite, and a few flakes of brown mica. Analysis by J. E. 
Whitfield, record No. 1057. Material dried at 104°. 
B. Absarokite dike, head of Lamar River. Lamarose. Contains olivine and 
augite in a groundmass of orthoclase and plagioclase, with accessory magnetite, biotite, 
and ilmenite. 
C. Absarokite dike, south of Clark Fork. Absarokose. Contains augite, quartz, 
biotite, magnetite, orthoclase, plagioclase, and sometimes analcite. 
D. Absarokite lava flow, head of Raven Creek. Acntallenose. Contains olivine, 
augite, orthoclase, labradorite, magnetite, apatite, and a little serpentine. 
E. Absarokite dike, divide east of Cache Creek. Absarokose. Contains orthoclase, 
plagioclase, augite, biotite, magnetite, serpentine, and occasional quartz. 
Analyses B, C, D, and E by L. G, Eakins, record Nos. 1086, 1365. 
