obsidian hydration method

obsidian hydration method

[äb¦sid·ē·ən hī′drā·shən ‚meth·əd]
(archeology)
A chemical dating method that depends on the progressive thickening of a hydrated layer on the surface of volcanic glass.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.