orthochronology

orthochronology

[‚ȯr·thə·krə′näl·ə·jē]
(geology)
Geochronology based on a standard succession of biostratigraphically significant faunas or floras, or based on irreversible evolutionary processes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.