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3. ISHAWODA INTRUSIVES.

Descriptions, hitherto unpublished, supplied by Arnold Hague and T. A. Jaggar, jr. Analyses A and B by H. N. Stokes, record No. 1804; C and D by W. F. Hillebrand, No. 1765.

A. Granite-porphyry, base of Crater Mountain. Contains oligoclase, orthoclase, biotite, and quartz.

Yellowstonose.

B. Diorite-porphyry, Cabin Creek. Tonalose. Contains plagioclase, orthoclase, quartz, and abundant hornblende. This rock is intermediate between granite-porphyry and diorite-pophyry, but nearer to the latter.

C. Diorite, base of Needle Mountain. Yellowstonose. Contains plagioclase, quartz, biotite, with subordinate hornblende and orthoclase. Structure granitic.

D. Diabase, entrance to Shoshone Canyon. Andose. Contains plagioclase, augite, and chlorite.

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4. DIKES IN BRECCIA.

Descriptions, hitherto unpublished, supplied by Arnold Hague and T. A. Jaggar, jr. Analyses A, B, D, by H. N. Stokes, record No. 1804; C, E, F, G, H, by W. F. Hillebrand, Nos. 1765 and 1801.

A. Hornblende-pyroxene-andesite, Eagle Creek. Camptonose. Contains plagioclase, hornblende, pyroxene, quartz, and apatite.

B. Leucite-absarokite, Sunlight Valley. Lamarose. Contains phenocrysts of olivine and augite, with secondary alteration of the olivine to serpentine. The groundmass contains magnetite, augite, plagioclase, and orthoclase. Leucite abundant.

C. Gabbro-porphyry, Deer Creek. Shoshonose. Contains plagioclase, pyroxene, olivine, ilmenite, and apatite.

D. Hornblende-augite-andesite, Wind River Plateau. Tonalose. Contains phenocrysts of augite, hypersthene, and hornblende, plagioclase, and fine magnetite grains.

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E. Augite-andesite, Dike Mountain. Shoshonose. Contains augite, plagioclase, serpentinized olivine, magnetite, and apatite.

F. Trachyte-andesite, Dike Mountain. Akerose. Contains plagioclase, orthoclase, chlorite, apatite, and magnetite. Very little augite. G. Biotite-trachyte, Dike Mountain. Nordmarkose. Contains plagioclase, orthoclase, biotite, magnetite, and chlorite.

H. Biotite-trachyte, Dike Mountain. Pulaskose. Contains orthoclase, plagioclase, biotite, and magnetite.

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4. ABSAROKITE-SHOSHONITE-BANAKITE SERIES.

Rocks from the Yellowstone Park and the Absaroka Range, described in Mɔn. XXXII, Pt. II, and also by Iddings in Journal of Geology, vol. 3, pp. 938, 943, 947. The rock A, from Ishawooa Canyon, is also described by Hague in Amer. Journ. Sci., 3d series, 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. Kentallenose. 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 occassional quartz.

Analyses B, C, D, and E by L. G. Eakins, record Nos. 1086, 1365.

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F. Shoshonite lava sheet, Lamar River, south of Bison Peak. Shoshonose. Contains plagioclase, orthoclase, augite, olivine, magnetite, and serpentine, with amygdules of zeolite and calcite. Analysis by Eakins, No. 1086.

G. Shoshonite lava sheet, southeast fork of Beaverdam Creek. Shoshonose. Contains plagioclase, orthoclase, augite, and serpentinized olivine.

H. Leucite (?) shoshonite lava sheet, mountain east of Pyramid Peak. Shoshonose. Contains feldspars, olivine, serpentine, augite, magnetite, brown mica, and impure leucite (?).

I. Olivine-free shoshonite dike, northeast of Indian Peak. Shoshonose. Contains augite, plagioclase, biotite, and magnetite.

J. Shoshonite lava sheet, Two Ocean Pass. Shoshonose. Contains orthoclase, serpentinized olivine, magnetite, augite, chlorite, biotite, apatite, labradorite. Dried at 104°.

Analyses G, H, I by Eakins, Nos. 1371, 1375, 1379. Analysis J by Whitfield, No. 906.

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