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    Middle Triassic ammonites from Sonora, México

    Middle Triassic ammonites from Sonora, México by John W. Estep, Spencer G. Lucas, Carlos M. González-León

    Published 2018-12-01
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  2. 2
    Permian-Triassic boundary at El Antimonio, Sonora, Mexico

    Permian-Triassic boundary at El Antimonio, Sonora, Mexico by Spencer G. Lucas, Barry S. Kues, John W. Estep, Carlos M. González-León

    Published 2018-12-01
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