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A thick sequence of quartzite and schist exposed on Mount Harrison in the Albion Mountains, Idaho, is described and tentatively correlated with the upper part of Proterozoic Z McCoy Creek Group and Proterozoic Z and Lower Cambrian Prospect Mountain Quartzite (restricted) in the Pilot Range, Utah and Nevada, on the basis of lithology, thickness, and sedimentary structures. Correlations with early Paleozoic or middle Proterozoic strata exposed in central Idaho are considered to be less probable. Rapid thickness changes and locally thick conglomerates in Unit G of McCoy Creek Group (and its proposed correlatives in the Albion Mountains) indicate that cJepositional environments were variable locally. Environments were more uniform during the deposition of limy shaly and limestone in the top of Unit G and quartz sandstone in subsequent strata. The strata on Mount Harrison identified as Proterozoic Z and Lower Cambrian in this study are part of an overturned, structurally complicated sequence of metasedimentary rocks that lie tec topically on overturned, metamorphosed Ordovician carbonate strata and possible metamorphosed Cambrian shale, suggesting that a typical miogeoclinal sequence (Proterozoic Z to Ordovician) was possibly once present near the Albion Mountains area. Elsewhere in the Albion Mountains and the adjoining Raft River and Grouse Creek Mountains, however, Ordovician carbonate rocks appear to stratigraphically overlie metamorphosed clastic rocks of uncertain age that are dissimilar to miogeoclinal rocks of the region. The section on Mount Harrison may be a relict of a more complete section which is tectonically thinned elsewhere in the metamorphic terrane, or may be a far-travelled allochthonous slice of miogeocline juxtaposed with non-miogeoclinal facies rocks of similar age.

u.s. geological survey open file report/open-file report

Proposed correlation of an allochthonous quartzite sequence in the Albion Mountains, Idaho, with Proterozoic Z and Lower Cambrian strata of the Pilot Range, Utah and Nevada