EarthRef.org Reference Database (ERR) -- Doell et al. 1968

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Doell et al. 1968

Doell, R.R., Dalrymple, G.B., Smith, R.L. and Bailey, R.A. (1968). Paleomagnetism, potassium-argon ages, and geology of rhyolites and associated rocks of the Valles Caldera, New Mexico. Geological Society of America, Memoir 116: 211-248.

Paleomagnetic and potassium-argon studies support geologic evidence that the lower member of the Bandelier Tuff was deposited 1.4 m.y. ago. The upper member erupted about 1.0 m.y. ago and was followed by caldera collapse which formed the 12- to 14-mile diameter Valles Caldera. Post-caldera activity which resulted in the eruption ofrhyolite domes and pyroclastic material, has occurred at about 0.9, 0.7, 0.5, and 0.4 m.y. ago, with later undated eruptions that were estimated at about 0.1 m.y. ago. These data from the Valles Caldera are the basis for the previously published age revision of the Brunhes-Matuyama geomagnetic polarity epoch boundary from 1.0 to 0.7 m.y. ago, and they were used to define the Jaramillo normal polarity event at about 0.9 m.y. ago (Doell and Dalrymple, 1966).

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	Paleomagnetic Methods
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Keywords
absolute age, Cenozoic dates, igneous rocks, New Mexico, paleomagnetism, rhyolites and associated rocks, United States, Valles Caldera, volcanic rocks, Geochronology

Journal
Geological Society of America, Memoir
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The Geological Society of America
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