Fossil mammals and the early Eocene age of the San Jose Formation, San Juan Basin, New Mexico
— Spencer G. Lucas and Thomas E. Williamson
Fossil mammals from the San Jose Formation in the San Juan Basin are the only means by which an age can be assigned to the San Jose Formation. These mammals indicate an early Eocene (middle Wasatchian, Lysitean) age for the entire San Jose Formation except its basal strata, which have not produced age-diagnostic fossils. Selected, age-diagnostic fossil mammals from the San Jose Formation are illustrated here.
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- Lucas, Spencer G.; Williamson, Thomas E., 1992, Fossil mammals and the early Eocene age of the San Jose Formation, San Juan Basin, New Mexico, in: San Juan Basin IV, Lucas, Spencer, G.; Kues, Barry S.; Williamson, Thomas E.; Hunt, Adrian P., New Mexico Geological Society, Guidebook, 43rd Field Conference, pp. 311-316. https://doi.org/10.56577/FFC-43.311