GSA Geologic Time Scale

The time scale printed in April/May 2009 GSA Today contained a spelling error (under ORDOVICIAN: HIMANTIAN should be HIRNANTIAN). This page contains the corrected version.
[ read about the changes | view printable PDF ]

Note that the authors are still accepting comments on the overall content of time scale. Offer your comments or join in the discussion on GSA's Facebook page.

updated 8 April 2009