A new late Hemingfordian vertebrate fauna from Hawk Rim, Oregon, with implications for biostratigraphy and geochronology

LITERATURE CITED

• Albright, L. B., III, M. O. Woodburne, T. J. Fremd, C. C. Swisher III, B. J. MacFadden, and G. R. Scott. 2008. Revised chronostratigraphy and biostratigraphy of the John Day Formation (Turtle Cove and Kimberly Members), Oregon, with implications for updated calibration of the Arikareean North American Land Mammal Age. The Journal of Geology 16:211–237.
   Web of Science ®Google Scholar
• Bailey, B. A. 2004. Biostratigraphy and biochronology of early Arikareean through late Hemingfordian small mammal faunas from the Nebraska Panhandle and adjacent areas. Paludicola 4(3):81–113.
   Google Scholar
• Barbour, E. H., and H. J. Cook. 1914. Two new fossil dogs of the genus Cynarctus from Nebraska. Nebraska Geological Survey 4(15):225–227.
   Google Scholar
• Barnosky, A. D., F. Bibi, S. S. B. Hopkins, and R. Nichols. 2007. Biostratigraphy and magnetostratigraphy of the Mid-Miocene Railroad Canyon sequence, Montana and Idaho, and age of the Mid-Tertiary unconformity west of the continental divide. Journal of Vertebrate Paleontology 27:204–224.
   Web of Science ®Google Scholar
• Baskin, J. A. 1998. Mustelidae; pp. 152–173 in C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America. Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge, U.K.
   Google Scholar
• Bestland, E. A. 1998. Stratigraphy of the Mid-Miocene Mascall Formation (Lower Part) in Its Type Area. A report prepared for the John Day Fossil Beds National Monument and Bureau of Land Management, Prineville District, Oregon, 34 pp.
   Google Scholar
• Bjork, P. R. 1970. The Carnivora of the Hagerman Local Fauna (Late Pliocene) of Southwestern Idaho. Transactions of the American Philosophical Society 60(7):3–54.
   Web of Science ®Google Scholar
• Bowditch, T. E. 1821. An Analysis of the Natural Classification of Mammalia for the Use of Students and Travelers. John Smith, Paris, France, 115 pp.
   Google Scholar
• Brandt, J. F. 1855. Untersuchungen über die Craniologischen Entwickelungsstufen ung die davon herzuleitenden Verwandtschaften und Classification der Nager der Jetztwelt mit besonderer Beziehung auf die Gattung Castor. Mémoires de l'Academie impériale des sciences de Saint-Pétersbourg, sixième série Sciences Mathematiques, Physiques et Naturelles, seconde partie, Sciences Naturelles 7:127–365.
   Google Scholar
• Bryant, J. D. 1991. New Early Barstovian (Middle Miocene) vertebrate from the Upper Torreya Formation, eastern Florida Panhandle. Journal of Vertebrate Paleontology 11:472–489.
   Google Scholar
• Calede, J. J. M., and S. S. B. Hopkins. 2012a. Intraspecific versus interspecific variation in Miocene Great Basin mylagaulids: implications for systematic and evolutionary history. Zoological Journal of the Linnean Society 164:427–450.
   Web of Science ®Google Scholar
• Calede, J. J. M., and S. S. B. Hopkins. 2012b. New material of Alphagaulus pristinus (Mammalia, Rodentia, Mylagaulidae) from the Deep River Formation (Montana, USA): implications for ecology, ontogeny, and phylogeny. Journal of Vertebrate Paleontology 32:151–165.
   Web of Science ®Google Scholar
• Chaney, R. W., and D. I. Axelrod. 1959. Miocene floras of the Columbia plateau. Carnegie Institute of Washington Publication 617(1959):1–237.
   Google Scholar
• Condon, D. J., B. Schoene, N. M. McLean, S. A. Bowring, and R. R. Parrish. 2015. Metrology and traceability of U-Pb isotope dilution geochronology (EARTHTIME Tracer Calibration Part I). Geochimica et Cosmochimica Acta 164:464– 480.
   Web of Science ®Google Scholar
• Condon, T. 1896. Scientific description of two new fossil dogs. Bulletin of the University of Oregon 2:11.
   Google Scholar
• Coombs, M. C. 1978. Reevaluation of Early Miocene North American Moropus (Perissodactyla, Chalicotheriidae, Schizotheriinae). Bulletin of Carnegie Museum of Natural History 4:1–62.
   Google Scholar
• Coombs, M. C. 2004. Moropus merriami in the early Barstovian Lower Snake Creek fauna of Nebraska, with comments on biogeography of North American chalicotheres. Bulletin of the American Museum of Natural History 285:191–208.
   Google Scholar
• Coombs, M. C., R. M. Hunt Jr., E. Stepleton, L. B. Albright III, and T. J. Fremd. 2001. Stratigraphy, chronology, biogeography, and taxonomy of Early Miocene small chalicotheres in North America. Journal of Vertebrate Paleontology 21:607–620.
   Web of Science ®Google Scholar
• Cope, E. D. 1881. Review of the Rodentia of the Miocene period of North America. Bulletin of the United States Geological and Geographical Survey of the Territories 6:361–386.
   Google Scholar
• Czaplewski, N. J. 2012. A Mylagaulus (Mammalia, Rodentia) with nasal horns from the Miocene (Clarendonian) of western Oklahoma. Journal of Vertebrate Paleontology 32:139–150.
   Web of Science ®Google Scholar
• Davydov, V. I., J. L. Crowley, M. D. Schmitz, and V. I. Poletaev. 2010. High-precision U-Pb zircon age calibration of the global Carboniferous time scale and Milankovitch-based cyclicity in the Donets Basin, eastern Ukraine. Geochemistry, Geophysics, Geosystems 11, Q0AA04, doi:10.1029/2009GC002736.
   Web of Science ®Google Scholar
• DeGusta, D., and E. Vrba. 2003. A method for inferring paleohabitats from the functional morphology of bovid astragali. Journal of Archaeological Science 30:1009–1022.
   Web of Science ®Google Scholar
• Douglass, E. 1909. Dromomeryx, a new genus of American ruminants. Annals of Carnegie Museum 457:1–479.
   Google Scholar
• Downing, K. F. 1992. Biostratigraphy, taphonomy, and paleobiology of vertebrates from the Sucker Creek Formation (Miocene) of Southeast Oregon. Ph.D dissertation, University of Arizona, Tucson, Arizona, 485 pp.
   Google Scholar
• Downs, T. 1956. The Mascall fauna from the Miocene of Oregon. University of California Publications in Geological Science 31(5):199–354.
   Google Scholar
• Drake, E. T. 1978. Horse genealogy: the Oregon connection. Geology 6:587–591.
   Web of Science ®Google Scholar
• Edwards, E. J., C. P. Osborne, C. A. E. Stromberg, and S. A. Smith. 2010. The origins of C4 grasslands: integrating evolutionary and ecosystem science. Science 328:587–591.
   PubMed Web of Science ®Google Scholar
• Fagan, S. R. 1960. Osteology of Mylagaulus laevis, a fossorial rodent from the Upper Miocene of Colorado. University of Kansas Paleontological Contributions 26(9):1–30.
   Google Scholar
• Fischer von Waldheim, G. 1817. Adversaria zoologica. Mémories de la Société Impériale des Naturalistes de l'Université Impériale de Moscou 5:368–428.
   Google Scholar
• Fremd, T. J. 2010. Guidebook: SVP Field Symposium 2010, John Day Basin Field Conference. Geoscientists-in-the-Parks document, 2009-GRD. National Park Service, Denver, Colorado.
   Google Scholar
• Frick, C. 1937. Horned ruminants of North America. Bulletin of the American Museum of Natural History 69:1–69.
   Google Scholar
• Galbreath, 1955. Skull and skeleton of a mustelid, Brachypsalis, from the Miocene of northeastern Colorado. University of Kansas Paleontological Contributions 20(5):1–16.
   Google Scholar
• Gazin, C. L. 1930. A Tertiary vertebrate fauna from the upper Cuyama drainage basin, California. Carnegie Institute of Washington Publication 404:55–76.
   Google Scholar
• Gazin, C. L. 1932. A Miocene mammalian fauna from southeastern Oregon. Contributions to Paleontology, Carnegie Institution of Washington 418(3):37–86.
   Google Scholar
• Gervais, P. 1848. Mammifères fossiles du Gard. Académie du Sciences et Lettres, Montpellier, France, pp. 10–11. Gervais, 1848.
   Google Scholar
• Gidley, J. W. 1906. A new genus of horse from the Mascall beds, with notes on the small collections of equine teeth in the University of California. Bulletin of the American Museum of Natural History 22:385–388.
   Google Scholar
• Gill, T. 1872. Arrangement of the families of mammals with analytical tables. Smithsonian Miscellaneous Collections 11:1–98.
   Google Scholar
• Ginsburg, L. 1961. Le faune des carnivores Miocènes de Sansan. Mémoires du Muséum National d'histoire Naturelle, Nouvelle Série, Série C 9:1–187.
   Google Scholar
• Ginsburg, L., and J. Morales. 1992. Contribution à la connaissance des Mustélidés (Carnivora, Mammalia) du Miocène d'Europe Trochictis et Ischyrictis, genres affines et genres nouveaux. Comptes Rendus de l'Académie des Sciences Paris 315(II):111–116.
   Google Scholar
• Gray, J. E. 1821. On the natural arrangement of vertebrose animals. London Medical Repository 15:296–310.
   Google Scholar
• Gray, J. E. 1866. Notes on the pronghorn buck (Antilocapra) and its position in the system. Annals and Magazine of Natural History 3:323–326, 468–469.
   Google Scholar
• Haeckel, E. 1866. Generelle Morphologie der Organismen, Volume 2. Georg Reimer, Berlin, 462 pp.
   Google Scholar
• Harris, J. M., and L. Liu. 2007. Superfamily Suoidea; pp. 130–150 in D. R. Prothero and S. E. Foss (eds.), The Evolution of Artiodactyls. John Hopkins University Press, Baltimore, Maryland.
   Google Scholar
• Honey, J. G., J. A. Harrison, D. R. Prothero, and M. S. Stevens. 1998. Camelidae; pp. 439–462 in C. Janis, K. M. Scott, and L. L Jacobs (eds.), Evolution of Tertiary Mammals of North America. Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge, U.K.
   Google Scholar
• Hulbert, R. C., Jr., and B. J. MacFadden. 1991. Morphological transformation and cladogenesis at the base of the adaptive radiation of Miocene hypsodont horses. American Museum of Natural History Novitates 3000:1–61.
   Google Scholar
• Hunt, R. M., Jr. 1998. Amphicyonidae; pp. 196–227 in C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America. Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge, U.K.
   Google Scholar
• Hunt, R. M., Jr. 2003. Intercontinental migration of large mammalian Carnivores: earliest occurrence of the Old World beardog Amphicyon (Carnivora, Amphicyonidae) in North America. Bulletin of the American Museum of Natural History 279:77–115.
   Google Scholar
• Jacobs, B. F., J. D. Kingston, and L. L. Jacobs. 1999. The origin of grass-dominated ecosystems. Annals of the Missouri Botanical Garden 86:590–643.
   Web of Science ®Google Scholar
• Jaffey, A. H., K. F. Flynn, L. E. Glendenin, W. C. Bentley, and A. M. Essling. 1971. Precision measurements of the half-lives and specific activities of 235U and 238U. Physical Review C 4:1889–1906.
   Web of Science ®Google Scholar
• Janis, C. M., and P. B. Wilhelm. 1993. Were there mammalian pursuit predators in the Tertiary? Dances with wolf avatars. Journal of Mammalian Evolution 1:103–125.
   Google Scholar
• Janis, C. M., M. W. Colbert, M. C. Coombs, W. D. Lambert, B. J. MacFadden, B. J. Mader, D. R. Prothero, R. M. Schoch, J. Shoshani, and W. P. Wall. 1998. Perissodactyla and Proboscidea. pp. 511–622 in C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America. Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge, U.K.
   Google Scholar
• Jordan, B. T., A. L. Grunder, R. A. Duncan, and A. L. Deino. 2004. Geochronology of age-progressive volcanism of the Oregon high lava plains: implications for the plume interpretation of Yellowstone. Journal of Geophysics Research 109:B10202.
   Google Scholar
• Koppers, A. A. P. 2002. ArArCALC-Software for 40Ar/39Ar age calculations. Computational Geosciences 28:605–619. Available at http://earthref.org/ArArCALC/. Accessed July 4, 2015.
   Web of Science ®Google Scholar
• Koppers, A. A. P., H. Staudigel, J. R. Wijbrans, and M. Pringle. 2003. Short-lived and discontinuous intraplate volcanism in the South Pacific: hot spots or extensional volcanism? Geochemistry, Geophysics, Geosystems 4:1–49.
   Web of Science ®Google Scholar
• Korth, W. W. 1999. Hesperogaulus, a new genus of mylagaulid rodent (Mammalia) from the Miocene. Journal of Paleontology 73:945–951.
   Web of Science ®Google Scholar
• Korth, W. W. 2000. Review of Miocene (Hemingfordian to Clarendonian) mylagaulid rodents (Mammalia) from Nebraska. Annals of the Carnegie Museum 69:227–280.
   Web of Science ®Google Scholar
• Korth, W.W. 2001. Comments on the systematics and classification of the beavers (Rodentia, Castoridae). Journal of Mammalian Evolution 8:279–296.
   Google Scholar
• Korth, W. W., and R. J. Emry. 1997. The skull of Anchitheriomys and a new subfamily of beavers (Castoridae, Rodentia). Journal of Paleontology 71:343–347.
   Web of Science ®Google Scholar
• Kuiper, K. F., A Deino, F. J. Hilgen, W. Krijgsman, P. R. Renne, and J. R. Wijbrans. 2008. Synchronizing rock clocks of earth history. Science 320:500–504.
   PubMed Web of Science ®Google Scholar
• Lartet, E. 1836. Lettre à Mr. Michelin sur les premieres fouilles de Sansan. Bulletin de la Societe geologique de France 7:217–220.
   Google Scholar
• Leidy, J. 1858. Notice of the remains of extinct Vertebrata, from the Valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U.S.Top.Eng., by Dr. F. V. Hayden, Geologist to the Expedition. Proceedings of the Academy of Natural Sciences of Philadelphia 10:20–29.
   Google Scholar
• Lim, J.-D., and L. Martin. 2002. A new fossil mustelid from the Miocene of South Dakota, USA. Naturwissenschaften 89:270–274.
   PubMed Web of Science ®Google Scholar
• Linnaeus, C. 1758. Systema naturae per regna tria naturae, secundum classis, ordines, genera, species cum characteribus, differentiis, synonyms locis, 10th revised edition, Volume 1. Laurentii Salvii, Stockholm, 824 pp.
   Google Scholar
• Lydekker, R. 1883. Synopsis of the fossil Vertebrata of India. Records of the Geological Survey of India 16:61–69.
   Google Scholar
• MacFadden, B. J. 1998. Equidae. pp. 537–559 in C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America. Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge, U.K.
   Google Scholar
• MacFadden, B. J. 1999. Fossil Horses: Systematics, Paleobiology, and Evolution of the Family Equidae. Cambridge University Press, Cambridge, U.K., 369 pp.
   Google Scholar
• Maguire, K. C. 2014. Understanding the paleoecology and niche dynamics of mammals in the Mascall Fauna (Middle Miocene), Oregon. Ph.D. dissertation, University of California, Berkeley, Berkeley, California, 138 pp.
   Google Scholar
• Marsh, O.C. 1877. Notice of some new vertebrate fossils. American Journal of Science 81:249–256.
   Google Scholar
• Matthew, W. D. 1918. Contributions to the Snake Creek fauna, with notes upon the Pleistocene of western Nebraska. American Museum expedition of 1916. Bulletin of the American Museum of Natural History 38:183–229.
   Google Scholar
• Matthew. W. D. 1924. Third contribution to the Snake Creek Fauna. Bulletin of the American Museum of Natural History 50:59–210.
   Google Scholar
• Matthew, W. D. 1929. Critical observations upon Siwalik mammals. Bulletin of the American Museum of Natural History 56:437–560.
   Google Scholar
• Mattinson, J. M. 2005. Zircon U-Pb chemical abrasion (“CA-TIMS”) method: combined annealing and multi-step partial dissolution analysis for improved precision and accuracy of zircon ages. Chemical Geology 220:47–66.
   Web of Science ®Google Scholar
• McBirney, A. R. 1978. Volcanic evolution of the Cascade range. Annual Review of Earth and Planetary Sciences 6:437–456.
   Web of Science ®Google Scholar
• McGrew, P. O. 1938. Dental morphology of the Procyonidae with a description of Cynarctoides, gen. nov. Field Museum of Natural History, Geological Series 6:323–339.
   Google Scholar
• Merriam, J. C. 1906. Carnivora from the Tertiary formations of the John Day region. University of California, Bulletin, Department of Geology 5:171–205.
   Google Scholar
• Min, K., R. Mundil, P. R. Renne, and K. R. Ludwig. 2000. A test for systematic errors in 40Ar/39Ar geochronology through comparison with U/Pb analysis for a 1.1-Ga rhyolite. Geochimica et Cosmochimica Acta 64:73–98.
   Web of Science ®Google Scholar
• Morea, M. F. 1981. The Massacre Lake Local Fauna (Mammalia, Hemingfordian) from Northwestern Washoe County, Nevada. Ph.D. dissertation, University of California Riverside, Riverside, California, 247 pp.
   Google Scholar
• Morris, W. J. 1965. Graphic analysis of some Miocene horse astragali from California. Journal of Paleontology 39:657–662.
   Google Scholar
• Mörs, T., and R. C. Hulbert Jr. 2010. Anchitheriomys (Roger, 1898) or Amblycastor (Matthew, 1918) (Rodentia, Castoridae)? Taxonomic implications of a mandible from the Miocene of Florida. Journal of Vertebrate Paleontology 30:1899–1902.
   Web of Science ®Google Scholar
• Munthe, J. 1988. Miocene mammals of the Split Rock area, Granite Mountains Basin, central Wyoming. University of California Publications in the Geological Sciences 126:1–136.
   Google Scholar
• O'Leary, M. A. 2010. An anatomical and phylogenetic study of the osteology of the petrosal of extant and extinct artiodactylans (Mammalia) and relatives. Bulletin of the American Museum of Natural History 206:1–305.
   Google Scholar
• Orcutt, J. D., and S. S. B. Hopkins. 2011. The canid fauna of the Juntura Formation (Late Clarendonian), Oregon. Journal of Vertebrate Paleontology 31:700–706.
   Web of Science ®Google Scholar
• O'Sullivan, J. A. 2003. A new species of Archaeohippus (Mammalia, Equidae) from the Arikareean of central Florida. Journal of Vertebrate Paleontology 23:877–885.
   Web of Science ®Google Scholar
• O'Sullivan, J. A. 2008. Evolution of the proximal third phalanx in Oligocene-Miocene equids, and the utility of phalangeal indices in phylogeny reconstruction; pp. 159–165 in E. J. Sargis and M. Dagosto (eds.), Mammalian Evolutionary Morphology: A Tribute to Frederick S. Szalay. Springer Science, The Netherlands.
   Google Scholar
• Owen, R. 1848. Description of teeth and portions of jaws of two extinct anthracotheroid quadrupeds (Hyopotamus vectianus and H. bovinus) discovered by the Marchioness of Hastings in the Eocene deposits on the N.W. Coast of the Isle of Wight, with an attempt to develop Cuvier's idea of the classification of pachyderms by the number of their toes. Quarterly Journal of the Geological Society of London 4:104–141.
   Google Scholar
• Palmer, T. S. 1897. Notes on the nomenclature of four genera of tropical American mammals. Proceedings of the Biological Society of Washington 11:173–174.
   Google Scholar
• Petter, G. 1963. Contribution a l’étude des Mustélidés des basins Néogènes du Vallès-Pénédès et de Calatayud-Teruel. Mémoires de la Société géologique de France 97:1–44.
   Google Scholar
• Prothero, D. R. 2005. The Evolution of North American Rhinoceroses. Cambridge University Press, Cambridge, U.K., 218 pp.
   Google Scholar
• Prothero, D. R., and M. R. Liter. 2007. Family Palaeomerycidae; pp. 241–248 in D. R. Prothero and S. E. Foss (eds.), The Evolution of Artiodactyls. John Hopkins University Press, Baltimore, Maryland.
   Google Scholar
• Qiu, Z. 2003. Dispersals of Neogene Carnivorans between Asia and North America; pp. 18–32 in L. J. Flynn (ed.), Vertebrate fossils and Their Context: Contributions in Honor of Richard H. Tedford. Bulletin of the American Museum of Natural History 279, New York.
   Google Scholar
• Retallack, G. J. 2004. Late Miocene climate and life on land in Oregon within a context of Neogene global change. Palaegeography, Palaeoclimatology, Palaeoecology 214:97–123.
   Web of Science ®Google Scholar
• Rivera, T. A, M. Storey, M. D. Schmitz, and J. L. Crowely. 2013. Age intercalibration of 40Ar/39Ar sanidine and chemically distinct U/Pb zircon populations from the Alder Creek Rhyolite Quaternary geochronology standard. Chemical Geology 345:87–98.
   Web of Science ®Google Scholar
• Roger, O. 1885. Kleine paläontologische Mittellungen. II. Säugethierresteaus der Reischenau. (Zusamthal in Schwaben). Berichtedes Naturwissenschaftlichen Vereins für Schwaben und Neuburg 28:93–118.
   Google Scholar
• Roger, O. 1889. Wirbeltierreste aus dem Dinotheriensande der bayerisch-schwäbischen Hochebene. Bericht des Naturwissenschaftlichen Vereins für Schwaben und Neuburg 33:1–46.
   Google Scholar
• Rothwell, T. 2003. Phylogenetic systematic of North American Pseudaelurus (Carnivora: Felidae). American Museum Novitates 3403:1–64.
   Web of Science ®Google Scholar
• Schmitz, M. D., and V. I. Davydov. 2012. Quantitive radiometric and biostratigraphic calibration of the global Pennsylvanian-Early Permian time scale. Geological Society of America Bulletin 124:549–577.
   Web of Science ®Google Scholar
• Schmitz, M. D., and B. Schoene. 2007. Derivation of the isotope ratios, errors and error correlations for U-Pb geochronology using 205Pb-235U-(233U)-spiked isotope dilution thermal ionization mass spectrometric data. Geochemistry, Geophysics, Geosystems 8(8):1–20.
   Web of Science ®Google Scholar
• Scott, W. B. 1893. Geology and Paleontology. The American Naturalist 27:656–663.
   Google Scholar
• Shotwell, J. A. 1968. Miocene mammals of Southeast Oregon. Bulletin of the Museum of Natural History 14:1–67.
   Google Scholar
• Smith, G. A. 1986. Simtustus Formation: paleogeographic and stratigraphic significance of a newly defined Miocene unit in the Deschutes Basin, central Oregon. Oregon Geology 48:63–72.
   Google Scholar
• Smith, K., N. Czaplewski, and R. Cifelli. 2015. Middle Miocene carnivorans from the Monarch Mill Formation, Nevada. Acta Palaeontologica Polonica 61:231–252.
   Web of Science ®Google Scholar
• Steiger, R. H., and E. Jäger. 1977. Subcommission on geochronology: convention on the use of decay constant in geo- and cosmochronology. Earth and Planetary Science Letters 36:359–362.
   Web of Science ®Google Scholar
• Stirton, R. A. 1935. A review of the Tertiary beavers. University of California Publications in Geological Science 23(13):391–458.
   Google Scholar
• Taylor, J. R. 1997. An Introduction to Error Analysis: The Study of Uncertainties in Physical Measurements. University Science Books, Mill Valley, California, 327 pp.
   Google Scholar
• Tedford, R. H., T. Galusha, M. F. Skinner, B. E. Taylor, R. W. Fields, J. R. Macdonald, J. M. Rensberger, S. D. Webb, and D. P. Whistler. 1987. Faunal succession and biochronology of the Arikareean through Hemphillian interval (late Oligocene through earliest Pliocene epochs) in North America; pp. 153–210 in M. O. Woodburne (ed.), Cenozoic Mammals of North American: Geochronology and Biostratigraphy. University of California Press, Berkeley, California.
   Google Scholar
• Tedford, R. H., L. B. Albright III, A. D. Barnosky, I. Ferrusquia-Villafranca, R. M. Hunt Jr., J. E. Storer, C. C. Swisher III, M. R. Voorhies, S. D. Webb, and D. P. Whistler. 2004. Mammalian biochronology of the Arikareean through Hempillian interval (late Oligocene through Early Pliocene epochs); pp. 169–231 in M. O. Woodburne (ed.), Late Cretaceous and Cenozoic Mammals of North American: Biostratigraphy and Geochronology. Columbia University Press, New York.
   Google Scholar
• Thorpe, M. R. 1923. The primitive and carnivore-like characters of the Merycoidodontidae. American Journal of Science 33:239–246.
   Google Scholar
• Walker, G. W., and N. S. MacLeod. 1991. Geologic map of Oregon, special geologic map, 2 sheets. U.S. Geological Survey, Reston, Virginia.
   Google Scholar
• Wang, X., R. H. Tedford, and B. E. Taylor. 1999. Systematics of Borophaginae. Bulletin of American Museum of Natural History 243:1–391.
   Google Scholar
• Webb, S. D. 1965. The osteology of Camelops. Bulletin of the Los Angeles County Museum of Science 1:1–54.
   Google Scholar
• Wendell, W. G. 1970. The structure and stratigraphy of the Virgin Valley-McGee Mountain area, Humbolt County, Nevada. M.Sc. thesis, Oregon State University, Corvallis, Oregon, 130 pp.
   Google Scholar
• Woodburne, M. O. 2004. Global events and the North American mammalian biochronology; pp. 315–345 in M. O. Woodburne (ed.), Late Cretaceous and Cenozoic Mammals of North American: Biostratigraphy and Geochronology. Columbia University Press, New York.
   Google Scholar
• Wright, D. B. 1998. Tayassuidae; pp. 389–401 in C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America. Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge, U.K.
   Google Scholar
• York, D. 1969. Least squares fitting of a straight line with correlated errors. Earth and Planetary Science Letters 5:320–324.
   Web of Science ®Google Scholar
• Zachos, J. C., G. C. Dickens, and R. E. Zeebe. 2008. An early Cenozoic perspective on greenhouse warming and carbon-cycle dynamics. Nature 451:279–283.
   PubMed Web of Science ®Google Scholar