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A 40 -K 40 Dating of Igneous and Metamorphic Rocks in Western Montana

1960; University of Chicago Press; Volume: 68; Issue: 1 Linguagem: Inglês

10.1086/626639

1537-5269

Richard J. Hayden, John P. Wehrenberg,

Geological Studies and Exploration

$A^{40}-K^{40}$ dates, obtained by the use of the isotope dilution method, are reported for a number of occurrences of igneous and metamorphic rocks from western Montana.