Marble is a metamorphic rock that forms when limestone is subjected to heat and pressure underground, for example during the regional shifting of the Earth's crust or during volcanic activity.
"Marble, South Canyon, Mile 31.8, Colorado River, Grand Canyon, circa 1974," photograph by Margaret Eiseman. Margaret Eiseman Collection (48912). Cline Library, Northern Arizona University.
A05 Listening Woman (02-13) p. 76
A06 People of Darkness (03-06) p. 12
King, Hobart 2014 Marble. Geology.com http://geology.com/rocks/marble.shtml, accessed June 25, 2014.
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