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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 30 (1946)

Issue: 1. (January)

First Page: 131

Last Page: 131

Title: The First Oligocene Mammalian Fauna from Northern South America: ABSTRACT

Author(s): R. A. Stirton

Article Type: Meeting abstract


Fossil vertebrate remains were found on the northwest limb of the San Jose anticline south of the Rio Tetuan and approximately 10 kilometers northeast of Chaparral, Tolima, in the upper Magdalena region, Colombia. They were discovered in a thin lense of bone breccia within a blue-gray clay member (La Cira zone) of the Gualanday (Brazalosa) series.

The type La Cira from the middle Magdalena was called upper Oligocene by A. A. Olsson as based on a fresh-water invertebrate fauna. The mammal remains from Chaparral indicate a relationship close to the Deseado lower Oligocene of Argentina.

Tentative faunal list: Chelonian, crocodilian, ground-sloth, toxodont (? Proadinotherium), litoptern (? Prothesodon), astrapothere (near Uruguaytherium), and ? condylarth.

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Copyright 1997 American Association of Petroleum Geologists