Permian-Triassic boundary at El Antimonio, Sonora, Mexico

  • Spencer G. Lucas New Mexico Museum of Natural History and Science, New Mexico
  • Barry S. Kues Department of Earth and Planetary Sciences, University of New Mexico, New Mexico
  • John W. Estep New Mexico Museum of Natural History and Science, New Mexico
  • Carlos M. González-León Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Hermosillo, Sonora, México
Keywords: Permian-Triassic boundary, Sonora, Mexico.

Abstract

Newly discovered fossils indicate the Permian-Triassic boundary is in the lower Antimonio Formation. A brachiopod-dominated assemblage collected 40 m above the Monos-Antimonio Formations contact indicates a middle Permian (Guadalupian) age, and ammonites and conodonts found 380 to 530 m above the base of the Antimonio Formation indicate an Early Triassic (Spathian) age… in order to continue, download the full paper in PDF.

Published
2018-12-13
Issue
Vol 14 No 2 (1997)
Section
Regular Papers

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