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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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PIKAIA GRACILIENS: MIDDLE CAMBRIAN GRACE

Pikaia graciliens is an extinct, primative chordate animals from the Middle Cambrian Burgess Shale Lagerstätte of British Columbia, Canada. These lovelies swam by moving their bodies in a series of zigzag curves similar to the movement of eels, all the while filtering particles from the water.Although primitive, Pikaia shows the essential prerequisites for vertebrates. When alive, Pikaia was a

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