Talk:Eratosthenian

Copernicus as base of Copernician?
The article states that the Eratosthenian period ended with the formation of the crater Copernicus. However, though that crater formed during that period, it does not mark it's base. That statement should be removed. — Preceding unsigned comment added by Renerpho (talk • contribs) 00:42, 19 May 2015 (UTC)