Red flood plain mudstones in the Tucson Mountains show rare glimpses of Jurassic-age life and events, including horsetail rushes, animals tracks, mudcracks, water ripples and plants. Ongoing since 1989. The abstract is available here . Ice Age Mammals of the San Pedro River Valley, Southeastern Arizona. R. P. Ratkevich.
Dinosaur remains of southern Arizona.
D.L. Wolberg et al. eds. Symposium Proceedings, AZ State Univ. Dinosaurs of the Southwest , R. P. Ratkevich.