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What is the Login for?
The login box at the top allows users to request an account on the CHRONOS Portal that provides extra capacity in certain cases. Please note that all core services (searches, tools, etc) are available to anonymous users as well, an account is not required.

Timescales
You can find more information about the International Commission on Stratigraphy (ICS) timescales at http://www.stratigraphy.org. Some popular downloads are:

KT Poster
Tower of Time (
PDF | PNG)
Timescale bookmarks (USGS colors (ICS 2004) | CHRONOS (ICS 2004))