Revised geochronology of the Casamayoran South American Land Mammal Age: Climatic and biotic implications

• Main Authors: Kay, Richard F., Madden, Richard H., Vucetich, M. Guiomar, Carlini, Alfredo A., Mazzoni, Mario M., Re, Guillermo H., Heizler, Matthew, Sandeman, Hamish
• Format: Text
• Language: English
• Published: The National Academy of Sciences 1999
• Subjects: Biological Sciences; Antarctic; Argentina; Chubut; Antarc*
• Online Access: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC23931; http://www.ncbi.nlm.nih.gov/pubmed/10557304

Isotopic age determinations (40Ar/39Ar) and associated magnetic polarity stratigraphy for Casamayoran age fauna at Gran Barranca (Chubut, Argentina) indicate that the Barrancan “subage” of the Casamayoran South American Land Mammal “Age” is late Eocene, 18 to 20 million years younger than hitherto s...