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Migmatite from Orange Springs Farm, near Unionville, Virginia. Partial melting of this schist occurred during the late Ordovician Taconian Orogeny (~460 Ma). Sample courtesy T. Keller Grayson.
Eocene-aged hypabyssal andesite with anorthosite xenolith dated to ~1.4 Ga. Possible Grenvillian-age crust under Cristo Rey.
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