Abstract
The Belt Supergroup is a thick sequence of Middle Proterozoic strata occurring in western Montana, northern Idaho, and adjacent parts of Washington state, Alberta, and British Columbia (Ross 1963, Harrison 1972). In Glacier National Park the Belt strata are well exposed, relatively unmetamorphosed, and in many places structurally simple. In the central and northeastern part of the park the exposed Belt section is about 2900 m thick and consists of argillite, sandstone, and sandy and muddy limestone and dolostone. Most of these strata were deposited in shallow subtidal, intertidal, and alluvial settings, with offshore deposits occurring only in portions of the Appekunny Argillite (for a summary of the sedimentary geology of the Belt Supergroup in Glacier National Park see Horodyski 1983).
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