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
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,
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,
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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