Volcanic Islands

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Author: Charles Darwin

Singular Laminated Beds Alternating With and Passing Into Obsidian.

These beds occur within the trachytic district, at the western base of Green Mountain, under which they dip at a high inclination. They are only partially exposed, being covered up by modern ejections; from this cause, I was unable to trace their junction with the trachyte, or to discover whether they had flowed as a stream of lava, or had been injected amidst the overlying strata. There are three principal beds of obsidian, of which the thickest forms the base of the section. The alternating stony layers appear to me eminently curious, and shall be first described, and afterwards their passage into the obsidian. They have an extremely diversified appearance; five principal varieties may be noticed, but these insensibly blend into each other by endless gradations.

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Chicago: Charles Darwin, "Singular Laminated Beds Alternating With and Passing Into Obsidian.," Volcanic Islands, ed. Bryant Conant, James and trans. Babington, B. G. (Benjamin Guy), 1794-1866 in Volcanic Islands Original Sources, accessed August 11, 2022, http://www.originalsources.com/Document.aspx?DocID=51GQ2391K7AK2RH.

MLA: Darwin, Charles. "Singular Laminated Beds Alternating With and Passing Into Obsidian." Volcanic Islands, edited by Bryant Conant, James, and translated by Babington, B. G. (Benjamin Guy), 1794-1866, in Volcanic Islands, Original Sources. 11 Aug. 2022. http://www.originalsources.com/Document.aspx?DocID=51GQ2391K7AK2RH.

Harvard: Darwin, C, 'Singular Laminated Beds Alternating With and Passing Into Obsidian.' in Volcanic Islands, ed. and trans. . cited in , Volcanic Islands. Original Sources, retrieved 11 August 2022, from http://www.originalsources.com/Document.aspx?DocID=51GQ2391K7AK2RH.