EDUCATION: Earth, the Early Years

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Science  15 Jul 2005:
Vol. 309, Issue 5733, pp. 361
DOI: 10.1126/science.309.5733.361e

It's hard enough to remember what you did last Wednesday afternoon, let alone what happened during the Jurassic period. Geologic Time, a new interactive timeline from the Smithsonian Institution, offers a handy reference on the different stages of Earth's past. The site spotlights the geological and biological events of the different eons, eras, periods, and epochs. For example, you can leap back to the Archean Eon, which lasted from 4 billion to 2.5 billion years ago, when life originated and today's continents formed. Photo albums display representative rocks and fossils from each time. While Allosaurus and other dinosaurs stalked the land during the Jurassic, ammonites, relatives of today's squid, plied the seas. The site also includes backgrounders on concepts such as radioactive dating and plate tectonics.

www.nmnh.si.edu/paleo/geotime

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