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 diorite magma turned the surrounding limestone into marble, through contact metamorphism.
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TOP22075387
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達志影像
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RM
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earthsciencemt.gouldmountgouldglaciernationalparkmontanamountainunitedstatesnorthamericansceniclandscapelandformgeographygeologymountainsidecontactmetamorphismstratigraphyrockstratastratalayeredrocklayerplutonicintrusiveconcordantintrusivesheettabularsheetintrusionsilligneousrockrockformationmaficdioritedioritesillpurcellsill
americanconcordantcontactdioritedioriteearthformationgeographygeologyglaciergouldgouldigneousintrusionintrusiveintrusivelandformlandscapelayerlayeredmaficmetamorphismmontanamountmountainmountainsidemt.nationalnorthparkplutonicpurcellrockrockrockrockscenicsciencesheetsheetsillsillsillstatesstratastratastratigraphytabularunited