File:The American journal of science (1904) (17966087539).jpg

Title: The American journal of science
Identifier: americanjourna4171904newh (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Science
Publisher: New Haven : J. D. & E. S. Dana
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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258 Russell—Massive-Solid Volcanic Eruptions. " bread-crust bombs" were thrown out. It is of interest to add to this short list of volcanoes which have erupted material in a massive-solid condition, another example, from which lava was discharged in the three or four ways illustrated by Pele, and also gave origin to a stream of lava. The volcano referred to is one of five of modern date (post- Glacial) situated on the east border of Pauline Lake in the south-central part of Oregon, which was visited by the writer during the summer of 1902. A view of the interior of the crater, showing a rough but generally level surface surrounding
Text Appearing After Image:
Fig. 3. Crater of a volcano near Pauline Lake, Oregon, with massive- solid extrusion in its center. a central mass of crags, is here presented. The rim of the crater, not appearing in the illustration, is composed mainly of light-colored pumiceous lapilli, and is still intact for about three-fourths of its original circumference, but its northern por- tion is concealed, or more probably was breached and carried away by a lava flow which was discharged from the crater and went northward for a distance of two miles, and expanded to a width of about one mile. All of the material extruded seems to be andesite, which ranges in physical characteristics from compact, dense, black volcanic glass or obsidian, to yellow- ish-white pumice so light that it will float on water with the buoyancy of cork. The lava stream has an excessively rough surface, consisting of blocks of obsidian of all sizes up to eight or ten or more feet in diameter with sharp edges and corners, which form irregular piles and ridges in many instances fifty

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