date:june 10th
about geologic time
http://www.ucmp.berkeley.edu/education/explorations/tours/geotime/gtpage1.html
author:Jim Kupius
http://www.pbs.org/wgbh/nova/beta/evolution/brief-history-life.html
author: Lexi Krock
1.The mezozoic era
2. The period in the Paleozoic that is famous for coal swamps is the Carboniferous period.
3.The cambrian period was the first explosion of Life.
4.Holocene epoch
5.The extinction of the dinosaurs marked the end of the Mesozoic Era.
6.The last ice ages in michigan happen in the peliosticene epoch
7.longest to shortest: era, period, epoch
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