02321oam 2200661 450 991070967820332120180523155501.0(CKB)5470000002471452(OCoLC)896811450(EXLCZ)99547000000247145220141123d1997 ua 0engurn||||||||||txtrdacontentcrdamediacrrdacarrierPaleomagnetic and ⁴°Ar/³⁹Ar geochronologic data from Late Proterozoic mafic dikes and sills, Montana and Wyoming /by Stephen S. Harlan, John Wm. Geissman, and Lawrence W. SneeWashington :United States Government Printing Office,1997.1 online resource (16 pages) illustrations, mapsU.S. Geological Survey professional paper ;1580"Paleomagnetic and 40Ar/39Ar results from mafic dikes and sills in northwestern Wyoming and western Montana indicate that they were emplaced during a regional magmatic event at 780 to 770 Ma."Includes bibliographical references (pages 14-16).Geology, StratigraphicProterozoicGeochronometryMontanaGeochronometryWyomingSills (Geology)MontanaDikes (Geology)WyomingDikes (Geology)fastGeochronometryfastGeology, StratigraphicfastProterozoic Geologic PeriodfastSills (Geology)fastMontanafastWyomingfastGeology, StratigraphicGeochronometryGeochronometrySills (Geology)Dikes (Geology)Dikes (Geology)Geochronometry.Geology, Stratigraphic.Proterozoic Geologic Period.Sills (Geology)Harlan Stephen S.1405201Geissman John WilliamSnee Lawrence W.Geological Survey (U.S.),COPCOPOCLCOOCLCFOCLCQGPOBOOK9910709678203321Paleomagnetic and ⁴°Ar3481246UNINA