ore-lead age

ore-lead age

[′ȯr ′led ‚āj]
(geology)
An estimate of the age of the earth made by comparing the relative progress of the two radioactive decay schemes 235U-207Pb and 238U-206Pb.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.