Spongy chert mass (Skyline Caverns, Front Royal, Virginia, USA) 1
MAY 12 2016
Chert mass in a cave in Virginia, USA. Skyline Caverns is developed in structurally tilted carbonates (mixed dolostones and limestones) of the Rockdale Run Formation (Beekmantown Group, Lower Ordovici.
Source: Wikimedia Commons
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