Miocene basalt flows exposed along the Columbia river. Nodules of "Biggs jasper" occur between basalt flows.
Weddellite crystals occur in cavities in nodules of the "Biggs jasper" dredged out of the Columbia river.
Ref.:
J. A. Mandarino & N. V. Witt (1983): Weddellite from Biggs, Oregon, U.S.A. Canadian Mineralogist, 21, 503-508.
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Map Reference: 45°40'5"N , 120°50'14"W
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