Since 1889, the occurrence of dumortierite in southwestern Arizona has been known, but only as detrital boulders in the Colorado River terrace gravels between Ehrenberg and yuma. Such was the material from near Clip, Arizona, that was studied. by Diller andWhitfield,2 Ford,3 Schaller,4 and Bowen and Wyckoff.5 Clip is said by local old residents to have been situated across the river from Picacho, California.

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