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Title bar modified from montage by John Pojeta Jr. (USGS/Smithsonian)
Dates (in Ma) courtesy of the International Commission on Stratigraphy, 2003. (http://www.stratigraphy.org)
*Ma = Abbreviation for mega-annum (106 years); a million years.
Note on the Tertiary and the Quaternary: The Tertiary
and Quaternary have been eliminated from the most recent International
Stratigraphic Charts. The
Quaternary was formerly considered to be made up of the
Holocene and the Pleistocene. The Paleogene and older Neogene were defined
as the Tertiary.