Sandstone: Secular Trends in Lithology in Southwestern Montana

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Science  03 Nov 1972:
Vol. 178, Issue 4060, pp. 502-504
DOI: 10.1126/science.178.4060.502


Long-term secular trends in the composition and texture of sandstones in southwestern Montana reflect changing provenance and depositional environment, which in turn reflect changing tectonic patterns in the Cordilleran mobile belt just to the west.