Search Results       Your search for [subject]Sills (Geology) -- Montana returned 1 record.           Paleomagnetic and 4?Ar/?9Ar geochronologic data from Late Proterozoic mafic dikes and sills, Montana and Wyoming. by Snee, Lawrence W.; Washington: U.S. G.P.O., 1997. Subject: Geology, Stratigraphic -- Proterozoic; Geochronometry -- Montana; Geochronometry -- Wyoming; Sills (Geology) -- Montana; Dikes (Geology) -- Wyoming.          Add to Book Cart Relevance: 30.07%