Cubic salt casts are commonly observed in the Missoula Group (Precambrian Belt Supergroup) in northwestern Montana. This structure has been used as an environmental indicator and as a criterion of stratigraphic correlation. Salt casts are especially abundant in the Shields Formation, where field observations in the southern Lewis and Clark Range indicate that they occur exclusively on the bottoms of strata. Salt casts are reliable indicators of 'top and bottom' in this area and may be useful for that purpose in other areas of Shields exposure.

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