Potassium-Argon Ages of Precambrian Mafic Dikes in Wyoming

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Abstract
Potassium-argon dating of whole-rock contact zones from 27 Precambrian mafic dikes in Wyoming suggests several periods of intrusion in the time interval 700 to 2500 m.y. A widespread period at 1900 to 2200 m.y. is suggested by the data.