New occurrences of mammals from McKay Reservoir (Hemphillian, Oregon)

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dc.contributor.authorOrcutt, John D.
dc.contributor.authorSchmer, Christiana J.
dc.contributor.authorLubisich, Jeffrey P.
dc.contributor.authorAbrams, Lacy T.
dc.contributor.authorFamoso, Nicholas
dc.date.accessioned2024-09-24T21:39:47Z
dc.date.available2024-09-24T21:39:47Z
dc.date.issued2024-05-07
dc.description12 pages
dc.description.abstractEncompassing global cooling, the spread of grasslands, and biogeographic interchanges, the Hemphillian North American Land Mammal Age is an important interval for understanding the factors driving ecological and evolutionary change through time. McKay Reservoir near Pendleton, Oregon is a natural laboratory for analyses of these factors. It is remarkable for its small vertebrate fauna including rodents, bats, turtles, and lagomorphs, but also for its larger mammal fossils like camelids, rhinocerotids, canids, and felids. Despite the importance of the site, few revisions to its faunal list have been published since its original description. We expand on this description by identifying taxa not previously known from McKay Reservoir based on specimens collected during fieldwork and through reidentification of previously collected fossils. Newly identified taxa include the borophagine canid Borophagus secundus (Matthew and Cook, 1909), the camelids Megatylopus Matthew and Cook, 1909 and Pleiolama Webb and Meachen, 2004, a dromomerycid, and the equids Cormohipparion Skinner and MacFadden, 1977 and Pseudhipparion Ameghino, 1904. Specimens previously assigned to Neohipparion Gidley, 1903 and Hipparion de Christol, 1832 lack the features necessary to diagnose these genera, which are therefore removed from the site's faunal list. The presence of Borophagus secundus, Cormohipparion, and Pseudhipparion is especially important, because each occurrence represents a major geographic range extension. This refined understanding of the fauna lays the foundation for future studies of taphonomy, taxonomy, functional morphology, and paleoecology—potentially at the population, community, or ecosystem levels—at this paleobiologically significant Miocene locality.
dc.identifier.citationOrcutt JD, Schmer CJ, Lubisich JP, Abrams LT, Famoso NA. New occurrences of mammals from McKay Reservoir (Hemphillian, Oregon). Journal of Paleontology. Published online 2024:1-12. doi:10.1017/jpa.2023.98
dc.identifier.doihttps://doi.org/10.1017/jpa.2023.98
dc.identifier.orcidhttps://orcid.org/0000-0002-1795-624X
dc.identifier.urihttps://www.cambridge.org/core/journals/journal-of-paleontology/article/new-occurrences-of-mammals-from-mckay-reservoir-hemphillian-oregon/9162FBFA6C9829AA3346E7C9BCDA1A9A#article
dc.identifier.urihttps://hdl.handle.net/1794/30088
dc.language.isoen_US
dc.publisherJournal of Paleontology
dc.rightsCC-BY
dc.subjectpaleontology
dc.subjectMcKay Reservoir
dc.subjectmammals
dc.subjectfossil record
dc.titleNew occurrences of mammals from McKay Reservoir (Hemphillian, Oregon)
dc.typeArticle

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