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Geologists Get Together to Dissect Earth's Thin Skin

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Science  12 Nov 1993:
Vol. 262, Issue 5136, pp. 992-993
DOI: 10.1126/science.262.5136.992

Abstract

At the annual meeting of the Geological Society of America in Boston during late October, Earth's crust came in for close scrutiny. One surprise was its age: Chemical and isotopic evidence suggested the crust formed soon after the planet did. Participants also discussed features of today's crust, including a horizontal slice beneath San Francisco and the possibility that a particular kind of crustal stretching, long envisioned, may not actually take place.