500,000,000-Year-Old Wormholes

500,000,000-Year-Old Wormholes

The "lines" on this sandstone, which was once at the bottom of an inland sea where the Appalachian Mountains now stand, are the fossilized passages made by ancient sea worms called skolithos. Shenandoah National Park, VA-- August 2007
Bob Sihler
on Aug 20, 2007 9:05 pm
Image Type(s): Scenery
Image ID: 326492

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