Geochronology of Type Santacrucian (Middle Tertiary) Land Mammal Age, Patagonia, Argentina

Larry G. Marshall; Robert E. Drake; Garniss H. Curtis; Robert F. Butler; Kathy M. Flanagan; Charles W. Naeser

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The Journal of Geology

Article . 1986 . Peer-reviewed

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https://dx.doi.org/10.1086/629...

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Geochronology of Type Santacrucian (Middle Tertiary) Land Mammal Age, Patagonia, Argentina

descriptionPublicationkeyboard_double_arrow_right Article 01 Jul 1986 English Publisher:University of Chicago PressJournal:The Journal of Geology, volume 94, pages 449-457 (issn: 0022-1376, eissn: 1537-5269,

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Authors: Larry G. Marshall; Robert E. Drake; Garniss H. Curtis; Robert F. Butler; Kathy M. Flanagan; Charles W. Naeser;

doi: 10.1086/629050

Geochronology of Type Santacrucian (Middle Tertiary) Land Mammal Age, Patagonia, Argentina

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Abstract

Mammal-bearing lacustrine and tuffaceous sediments from three localities of the Santa Cruz Formation, type fauna of the Santacrucian Land Mammal Age, in Patagonia, southern Argentina, are calibrated by radioisotope dating with the aid of magnetostratigraphy. The strata range from about 17.6 Ma to perhaps 16.0 Ma, and are thus of late-early Miocene age. The Santacrucian Land Mammal Age ranges from about 18.0 Ma to about 15.0 Ma.

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