Title: Bulletin of the Geological Society of America
Identifier: bulletinofgeolo331922geol (find matches)
Year: 1890 (1890s)
Authors: Geological Society of America
Subjects: Geology
Publisher: (New York : The Society)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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SURFACE FUSION OF LAVA 143 by spreading, the crater was filled and overflowed, Liberating the most remark- able blasts of hot gas, which were shot down the slope as at Martinique, com- pletely devastating its path. That the extruded lava was softened by heat and rendered viscous is shown
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Figure 1.—Basaltic Lava from, San Salvador, Central America This basaltic lava was erupted by the Crater El Pinar of San Salvador volcano June 7, 1017, in the republic of San Salvador, Central America. Dr. S. Calderon sent the specimens to Washington, and states that they were "col- lected in pockets of scoria? formed by the escape of the gases, being found on all very steep slopes where the current of lava formed cascades." It is believed that the hot gases escaping from the lava-flow into the pockets met the gases of the air and reacted so as to become hot enough to melt the adjacent lava. The upper portion of the specimen is dull red. It is a part of the lava-flow the lower portion of which has been melted by the hot gases in a pocket. by the fact that the steam-torn lava was bent during the eruption. Portions of the bent lava were broken, but the continuity of the mass indicates that most of the lava at the time of its eruption was softened by heat to a highly viscous condition.

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