catoctin10

Float block of the Catoctin Formation, the ~570 Ma flood basalt (now greenstone) that records the breakup of Rodinia. It is a prominent ridge-former in Shenandoah National Park.

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Taken on May 3, 2008
  • ƒ/2.8
  • 5.8 mm
  • 1/60
  • Flash (auto, did not fire)
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