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OREGON.

1. BASALT, MOUNT THIELSEN.

Partly described by Diller in Am. Journ. Sci., 3d series, vol. 28, p. 257. A hypersthene-basalt containing hypersthene, olivine, feldspar, and magnetite. In the printed paper only the analyses of the groundmass and the fulgurite formed in it are given.

A. Hypersthene-basalt.

B. Pyroxene.

C, D. Feldspars.

E. Groundmass.

F. A fulgurite, or lightning tube.

Analyses A and F by F. W. Clarke, record Nos. 108, 105; B, C, D, and E by T. M. Chatard, record Nos. 135, 133, 134, 128. These analyses were made early in the history of the laboratory and are by no means complete.

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Iron oxides not separated. Analyses B, C, D, and F made on very small quantities of material. C and D were analyzed by the hydrofluoric acid method, and the silica was determined by difference.

2. PERIDOTITE, DOUGLAS COUNTY.

The matrix of the nickel silicate at Riddle. Described by Diller and Clarke in Bull. 60, p. 21.

The rock, which may be classed as saxonite, consists essentially of olivine and enstatite, with a little chromite and magnetite. Olivine predominates, and the enstatite forms less than one-third of the mass. Quartz, serpentine, and genthite are present as alteration products. Analyses by F. W. Clarke, record Nos. 811, 814, 792.

A. The fresh rock. P. R. C. 114.

B. Separated olivine.

C. The genthite found in the altered rock. Probably derived from olivine.

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Rocks collected by J. S. Diller. Petrographic data, hitherto unpublished, supplied by Horace B. Patton for all except the last rock in the series. Analyses A to J, inclusive, by H. N. Stokes, record No. 1671.

A. Vitrophyric rhyolite, south edge of Llao Rock flow. Contains plagioclase, hypersthene, hornblende, and apatite in a glassy groundmass crowded with augite microlites.

B. Streaked rhyolite, near "Wine Glass" Grotto Cove. Contains plagioclase, hypersthene, hornblende, and magnetite, with black glass. A few small inclusions of basalt and hypersthene-andesite.

C. Rhyolite, small dike immediately below Llao Rock. Contains plagioclase, hornblende, hypersthene, and magnetite, in a glassy groundmass crowded with microlites of feldspar and augite.

D. Rhyolite, water's edge, head of Cleetwood Cove. Contains plagioclase, hypersthene, brown hornblende, and magnetite, in a feldspathic groundmass of trachytic type.

E. Hypersthene-augite-andesite, large dike transsecting the northwestern portion of the crater rim. Contains plagioclase, hypersthene, augite, and magnetite in a groundmass having a moderate amount of glass.

F. Hypersthene-augite-andesite, west edge of Wizard Island. Same minerals as E.

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Traces of manganese in all. Fluorine not sought for. No CO2, S, SO3, or Cr2O

in any.

G. Hypersthene-augite-andesite, crater rim, just south of "The Watchman." Same minerals as F.

H. Hypersthene-augite-andesite, Palisades, under Round Top, northeast portion of the rim. Contains plagioclase, hypersthene, augite, and magnetite.

I. Hypersthene-augite-andesite, lake level, under Llao Rock. Same minerals as H.

J. Basalt, base of Red Cone. Contains plagioclase, augite, olivine, and magnetite, with some glass base.

K. Basalt, one mile east of the summit of the Cascade Range, on the road from Fort Klamath to Crater Lake. Described by J. S. Diller as a typical basalt, carrying a considerable amount of hypersthene. Analysis by W. F. Hillebrand, record No. 408.

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4. ROCK FROM WILBUR, DOUGLAS COUNTY.

A tuff partly of igneous, partly of organic, origin. The igneous matter contains a few grains of feldspar and augite, with particles of a rock like diabase. The organic remains are partly calcareous and partly siliceous. Description supplied by J. S. Diller. Analysis by H. N. Stokes, record No. 1737.

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WASHINGTON.

Rocks from the Mount Stuart quadrangle, Kittitas County. Collected by George Otis Smith, who furnishes the petrographic data. Hitherto unpublished. Analyses A, B, C, F, and G by H. N. Stokes, record No. 1836; D, E, H, and I by W. F. Hillebrand, record No. 1831. A. Granodiorite, south slope of Mount Stuart. Contains plagioclase, orthoclase, hornblende, biotite, quartz, and magnetite.

B. Granodiorite, ridge between Hardscrabble and Cascade creeks. Contains plagioclase, orthoclase, biotite, hornblende, quartz, magnetite, and apatite.

C. Granodiorite-porphyry, dike 2 miles west of Mount Stuart. Contains plagioclase, biotite, hornblende, orthoclase, and quartz.

D. Serpentine, Three Brothers. Derived from saxonite. Contains serpentine, bastite, magnetite, and pyrite.

E. Metamorphic rock, head of Beverly Creek. Believed to be derived from an inclusion of limestone in the peridotite.

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