Template:Chronostratigraphy of Wisconsin

From blackwiki
Revision as of 20:17, 7 July 2018 by imported>J. Spencer (revision of the Ordovician has put many "Middle" Ordovician units into the Late Ordovician, the base of which is now dated to 458.4 Ma (the basal Decorah is almost pegged to the Deicke K-Bentonite of about 454.6 Ma))
Jump to navigation Jump to search