Purcell Sill, Glacier National Park

The Purcell Sill in Glacier National Park, Montana, is the black layer of rock between thin white layers, as seen here on Mt. Gould. A sill is a layer of igneous rock injected as a molten magma between beds of sedimentary rock. In this case, the hot dio

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Gould Igneous Intrusion Intrusive Landform Layer Layered Mafic Metamorphism Montana Mountainside Plutonic Science Sheet Sill Strata Stratigraphy Tabular

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