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| How well do you know the geologic time scale?
The Geologic Time Scale: A Quiz
See also: The Geologic Time Scale and Metaphors for geologic time.
Time Scale Instructions
List the units of the geologic time scale from most recent to oldest. Indicate whether each unit is an eon, era, epoch, or period. Provide a start and end time for each unit. If a unit ends with an extinction event listed in the pull down menu, select that event. Since larger and smaller units can end at the same time, each extinction event may be listed more than once. Some sources contain more units than others, so you may not need to fill all the rows in the table. Put larger (more inclusive) units first, then list the smaller units that go within them.
Example of smaller units nested in more inclusive units:
Sources: Assembled from various sources. The overall framework is from:Harland et al., 1990; Palmer, 1983. A number of dates and events are from a variety of more recent (1990s) sources.
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Written by Paul J. Morris firstname.lastname@example.org
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Date Created: 2000 July 16
Last Updated: 2000 August 12