Basalt xenolith in granite at Lost Palms Oasis
A basalt xenolith imbedded in granodiorite in the Lost Palms Oasis area. The basalt xenolith is probably a piece of the roof rock that the igneous pluton migrated upward into as it formed in Mesozoic time. Basalt xenoliths are common in granitic intrusions throughout the park.
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Last modified: 12/20/2010