Reassignment of the Lowland Creek Volcanics to Eocene Age

Reassignment of the Lowland Creek Volcanics to Eocene Age

Recent potassium-argon age determinations of 48 and 50 m.y. for biotite in rocks of the Lowland Creek Volcanics in southwestern Montana agree with previous K-Ar age of 49 m.y. for biotite of a dike rock correlated with lavas of the upper part of the volcanics. Together, these determinations establis...

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Veröffentlicht in:The Journal of geology 1965-05, Vol.73 (3), p.508-510
Hauptverfasser: Smedes, Harry W., Thomas, Herman H.
Format: Artikel
Sprache:eng
Schlagworte:
Batholiths
Biotite
Geological Notes
Geology
Lava
Lowlands
Plains
Rocks
Tuff
Volcanology
Watersheds
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Zusammenfassung:Recent potassium-argon age determinations of 48 and 50 m.y. for biotite in rocks of the Lowland Creek Volcanics in southwestern Montana agree with previous K-Ar age of 49 m.y. for biotite of a dike rock correlated with lavas of the upper part of the volcanics. Together, these determinations establish the age of the volcanics as early Eocene rather than late Oligocene, as they had been tentatively designated.
ISSN:0022-1376
1537-5269
DOI:10.1086/627082