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Science 28 May 1982:
Vol. 216. no. 4549, pp. 986 - 989
DOI: 10.1126/science.216.4549.986
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Articles

Geochronology of Type Uquian (Late Cenozoic) Land Mammal Age, Argentina

LARRY G. MARSHALL 1, ROBERT F. BUTLER 2, ROBERT E. DRAKE 3, and GARNISS H. CURTIS 3

1 Department of Geology, Field Museum of Natural History, Chicago, Illinois 60605
2 Department of Geosciences, University of Arizona, Tucson 85721
3 Department of Geology and Geophysics, University of California, Berkeley 94720

Mammal faunas collected from the Uquía Formation at Chucalezna and Esquina Blanca in Jujuy Province, northwest Argentina, are calibrated by potassium-argon age determinations and paleomagnetic polarity data. The sediments range in age from 2.5 million years old to perhaps as young as 1.5 million years, from late Pliocene through early Pleistocene, and correspond in time to late Blancan and early Irvingtonian land mammal age faunas in North America.

Submitted on January 27, 1982


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