During the field season of 1923 considerable witherite was observed filling cavities in the Altyn limestone of the Belt series in Glacier National Park. The chief exposures appear in the lower beds of the Altyn limestone immediately above the plane of the Lewis overthrust fault, along the gorge below Swiftcurrent Falls at Many Glacier. There are eighty to one hundred feet of the jointed platy limestone full of cavities containing the witherite.

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