Mammut pacificus Dooley et al., 2019

Pacific mastodon, Western mastodon



Taxonomy & Nomenclature



Conservation Status


Last record 15.87ka ± 0.19 cal BP (Dooley et al., 2019).



California & south-eastern Idaho (incl. Nevada per biogeographical bridge)



Biology & Ecology




Holotype: WSC 18743






Original scientific description:

Dooley, Alton Jnr., Scott, E., Green, J., Springer, K. B., Dooley, B. S. and Smith, G. J.. (2019). Mammut pacificus sp. nov., a newly recognized species of mastodon from the Pleistocene of western North America. PeerJ 7:e6614.


Other references:

Dooley, Alton C. Jnr., Scott, Eric and McDonald, H. Gregory. (2017). Mastodons of unusual size: how do California specimens of Mammut americanum compare to the rest of the country? In: Bevers, J., D. Curtis, I. Morton, and B. Boyd (eds.). 2017. Western Association of Vertebrate Paleontology Annual Meeting: Program with Abstracts. PaleoBios 34(Supplement): 1-14 [5]. [Abstract]

Holen, Steven R. et al. (2017). A 130,000-year-old archaeological site in southern California, USA. Nature 544: 479-483. [Abstract]

Htun, Thein et al. (2021). How did mastodons grow? Ontogenetic long bone growth in American mastodons, pp. 145-150. In: Lucas, Spences G. and Sullivan, Robert M. (eds). Fossil Record 7. New Mexico Museum of Natural History & Science Bulletin 82.

Jefferson, G. T. 1991a. A catalogue of Late Quaternary vertebrates from California. Part one; nonmarine lower vertebrate and avian taxa. Natural History Museum of Los Angeles County Technical Reports 5:1-60.

Jefferson, G. T. 1991b. A catalogue of Late Quaternary vertebrates from California. Part two: Mammals. Natural History Museum of Los Angeles County Technical Reports 7: 1-129.

Karpinski, Emil et al. (In Press, 2023). Mastodon mitochondrial genomes from American falls, Idaho. Quaternary International.

McDonald, A. T., Atwater, A. L., Dooley Jr, A. C. and Hohman, C. J. H. (2020). The easternmost occurrence of Mammut pacificus (Proboscidea: Mammutidae), based on a partial skull from eastern Montana, USA. PeerJ 8: e10030.

Schultz, J. R. 1937. A Late Quaternary mammal fauna from the tar seeps of McKittrick, California. Ph.D. thesis, California Institute of Technology, 202 pp + 2 plates.

Springer, K., E. Scott, C. Sagebiel, and L. K. Murray. 2009. The Diamond Valley Lake local fauna: Late Pleistocene vertebrates from inland southern California. Pp. 217-235, in Papers on geology, vertebrate paleontology, and biostratigraphy in honor of Michael O. Woodburne (L. G. Albright, III, ed.). Museum of Northern Arizona Bulletin 65, Flagstaff, Arizona.

Stock, C., and J. M. Harris. 1992. Rancho la Brea: A record of Pleistocene life in California. Natural History Museum of Los Angeles County, Science Series no. 37, 7th ed.:i-xiv + 1-113.


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