http:www'trilobites'com

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http//www.trilobites.com (I am not making this
up!
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Activity Make a timeline, showing Start of
the Universe (big bang) Formation of solar system
Earth Start of Life Start of Cambrian End of
Cretaceous Period over which Atlantic opened
up. Period over which rocks in England and Wales
formed End of heavy bombardment of the Earth by
planetesimals End of dinosaurs Chicxilub impact
event KT boundary
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Charles Doolittle Walcott
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Pikaia gracilens Pikaia is regarded as the
earliest known primitive chordate. It was about
40 mm in length and swam above the sea-floor.
Pikaia may have filtered particles from the water
as it swam along. Only 60 specimens have
been found to date.
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