Abstract
Measurements of 238U, 232Th, and 230Th have been made in separated phases from four of the Mono Craters volcanics and from one of the Inyo Craters. The results show that sufficiently large differences in U/Th ratio exist between the glass and horblende separates to allow dating of these eruptions. Suggested ages for the Mono Craters range between 2000 and 10,000 years, and show a general agreement with K-ar ages and geological evidence. The Inyo Crater sample has an apparent age of 35,000 years, ten times higher than the K-Ar age.
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