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National Park ServiceRuins of the Mariscal Mine
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Lava neck near Castolon  

Did You Know?
Near Cerro Castellan in Big Bend National Park are several lava necks that cooled and hardened in vents from which lava probably flowed. The largest and most spectacular of these has often been mistaken for a petrified tree.
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Last Updated: July 25, 2006 at 00:23 EST