nearly 500 million years ago, making the transition from sea to land possible. A Cambrian age sandstone in Wisconsin contains the fascinating arthropod tracks imaged above (click to enlarge.)
Monday, April 13, 2009
Those feet were made for walking...
nearly 500 million years ago, making the transition from sea to land possible. A Cambrian age sandstone in Wisconsin contains the fascinating arthropod tracks imaged above (click to enlarge.)
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