Ichthyosaurs from the upper Triassic of Sonora and the biochronology of Triassic ichthyosaurs

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作者：
Lucas, Spencer G. [1 ]
González-León, Carlos M. [2 ]
机构：
[1] New Mexico Museum of Natural History and Science, 1801 Mountain Road N. W., Albuquerque, NM 87104, United States
[2] Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Apartado Postal 1039, 83000 Hermosillo, Sonora, Mexico
来源：
Special Paper of the Geological Society of America | 1995年 / 301卷
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摘要：
Two ichthyosaur taxa-Shastasaurus altispinus and Toretocnemus californicus- are present in the upper Carnian Dilleri Zone of the Antimonio Formation in the northern part of the Sierra del Alamo, northwestern Sonora, Mexico. Ichthyosaurs allow recognition of three intervals of Triassic time: (A) Early Triassic-primitive ichthyosaurs; (B) Middle Triassic-Mixosaurus-Cymbospondylus acme biochron; and (C) Late Triassic-shastasaurid biochron.
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页码：17 / 20
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