Page 26 - Black Range Naturalist Vol 3 No 3 July 2020
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 Lucas, S. G. (2001). Oligocene. In The Age of Mammals and the Age of Volcanoes in New Mexico: An Outline of the Cenozoic Geology and Paleontology of the State (Vol. 18, pp. 36-37). Albuquerque, New Mexico: New Mexico Museum of Natural History (follow link for free download).
Morgan, G. S., & Lucas, S. G. (2003). Radioisotopically- calibrated oreodonts (Mammalia: Artiodactyla) from the Late Oligocene of southwestern New Mexico. Journal of Vertebrate Paleontology, 23(2), 471-473. doi: 10.1671/0272-4634(2003)023[0471:romaft]2.0.co;2
Morgan, G. S., & Lucas, S. G. (2012). Cenozoic Vertebrates From Sierra County, Southwestern New Mexico. New Mexico Geological Society Guidebook, 525-540.
Polly, Paul David. “Oreodont.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 12 July 2019, www.britannica.com/animal/oreodont.
Tedford, R. H. 1981. Mammalian biochronology of the late Cenozoic basins of New Mexico. Geological Society of America Bulletin 92: 1008-1022.
Wilkinson, Mark D., et al. “The FAIR Guiding Principles for Scientific Data Management and Stewardship.” Nature News, Nature Publishing Group, 15 Mar. 2016, www.nature.com/articles/sdata201618.
Mating Gopher Snakes
 Photographs by J. R. Absher
J. R. Absher, at the natural wonderland which is the A-Spear Ranch, was able to photograph mating Sonoran Gopher Snakes on April 21 of this year. Something often heard about but rarely seen.
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