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Patterns of Dental Evolution in Early Eocene Anaptomorphine Primates (Omomyidae) from the Bighorn Basin, Wyoming

Published online by Cambridge University Press:  11 August 2017

Thomas M. Bown  and
Kenneth D. Rose
Thomas M. Bown
Affiliation:
U.S. Geological Survey, Denver, Colorado 80225 and Department of Cell Biology and Anatomy, The Johns Hopkins University, Baltimore, Maryland 21205
Kenneth D. Rose
Affiliation:
U.S. Geological Survey, Denver, Colorado 80225 and Department of Cell Biology and Anatomy, The Johns Hopkins University, Baltimore, Maryland 21205
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Abstract

The subfamily Anaptomorphinae contains the oldest and most generalized members of the tarsier-like primates and is the basal group of the extinct family Omomyidae. The best and most continuous record of anaptomorphine history is from rocks of early Eocene (Wasatchian) age in the Bighorn Basin of northwest Wyoming where eight genera and 14 species are recognized. Three of these species are new (Teilhardina crassidens, Tetonius matthewi, Absarokius metoecus), and four other new species are described from elsewhere (Tetonius mckennai, Absarokius gazini, A. australis, Strigorhysis huerfanensis). Teilhardina tenuicula and Absarokius nocerai are new combined forms. Absarokius noctivagus is considered to be a synonym of A. abbotti, and Mckennamorphus is a synonym of Pseudotetonius.

The evolution of dental characters in three principal morphologic clades of anaptomorphines from the Bighorn Basin is documented with the aid of numerous new specimens (75% of the sample is new) and with precise stratigraphic data. These major clades are Teilhardina–Anemorhysis, Tetonius–Pseudotetonius, and Absarokius. In each of these clades, evolution appears to have occurred gradually. In the first two clades it was mainly anagenetic, although each one included a minor branching event. In Absarokius, evolution was instead characterized by cladogenesis followed by continued (and continual) anagenetic change in each of the new lines. Anagenetic gradual evolution produced the new genus Pseudotetonius (from Tetonius) and possibly Anemorhysis (from Teilhardina). Similarly, the Absarokius metoecus lineage probably gave rise to late Wasatchian–early Bridgerian Strigorhysis. Evolution from Tetonius to Pseudotetonius has been clarified by establishment of five arbitrary stages of evolution (Tetonius–Pseudotetonius intermediates). Estimates of relative proportions of time represented by paleosols in different parts of the Willwood section suggest that cladogenetic speciation in Absarokius was almost certainly more rapid than anagenesis in Tetonius–Pseudotetonius.

Anagenetic character evolution and speciation in the anaptomorphine primates was typified first by increase, then decrease in variability, which resulted in measurable apomorphic morphologic change. Cumulation of changes of this sort created more extensive differences of importance at the species and genus levels. Introduction of changing character states and their tempo was staggered temporally, and new characters (and new taxa) are least separable from their antecedent states when they first appear. This evidence is in sharp contrast to predictions of the punctuated equilibria model of evolution. Because the emergence of diagnostic characters occurs gradually (in evolutionary terms) and not all at once (in temporal terms), and because diagnostic characters are the essence of the diagnosis (and thereby taxonomy), the implications of gradual evolution for both systematic paleontology and biostratigraphy are profound. Stasis exists in the evolution of individual characters over certain periods, but this study offers no evidence supporting either organismic stasis or even stasis in the dental evolution of the Anaptomorphinae over a period of about 4.8 million years.

Type
Research Article
Information
Journal of Paleontology , Volume 61 , Issue S23: Paleontological Society Memoir 23. Patterns of Dental Evolution in Early Eocene Anaptomorphine Primates (Omomyidae) from the Bighorn Basin, Wyoming , September 1987 , pp. 1 - 162
Copyright
Copyright © 1987 by The Paleontological Society, Inc. 

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References

Beard, K. C., Rose, K. D., and Bown, T. M. 1986. Dental variation in the early Eocene Adapidae Cantius and Copelemur, and some paleoecological implications. American Journal of Physical Anthropology, 69:174.Google Scholar
Bell, M. A., Baumgartner, J. V., and Olson, E. C. 1985. Patterns of temporal change in single morphological characters of a Miocene stickleback fish. Paleobiology, 11:258–271.CrossRefGoogle Scholar
Berggren, W. A., Kent, D. V., Flynn, J. J., and Van Couvering, J. A. 1985. Cenozoic geochronology. Geological Society of America Bulletin, 96:1407–1418.2.0.CO;2>CrossRefGoogle Scholar
Billings, M. P. 1965. Structural Geology (2nd ed.). Prentice-Hall, Englewood Cliffs, 514 p.Google Scholar
Bookstein, F. L., Gingerich, P. D., and Kluge, A. G. 1977. Hierarchical linear modeling of the tempo and mode of evolution. Paleobiology, 4:120–134.CrossRefGoogle Scholar
Bown, T. M. 1974. Notes on some early Eocene anaptomorphine primates. Contributions to Geology, 13:19–26.Google Scholar
Bown, T. M. 1976. Affinities of Teilhardina (Primates, Omomyidae), with description of a new species from North America. Folia Primatologica, 25: 62–72.CrossRefGoogle ScholarPubMed
Bown, T. M. 1979a. Geology and mammalian paleontology of the Sand Creek facies, lower Willwood Formation (lower Eocene), Washakie County, Wyoming. Geological Survey of Wyoming Memoir 2, 151 p.Google Scholar
Bown, T. M. 1979b. New omomyid primates (Haplorhini, Tarsiiformes) from middle Eocene rocks of west-central Hot Springs County, Wyoming. Folia Primatologica, 31:48–73.CrossRefGoogle ScholarPubMed
Bown, T. M. 1980a. The Willwood Formation (lower Eocene) of the southern Bighorn Basin, Wyoming, and its mammalian fauna, p. 127–138. In Gingerich, P. D. (ed.), Early Cenozoic Paleontology and Stratigraphy of the Bighorn Basin, Wyoming. University of Michigan Papers on Paleontology, 24.Google Scholar
Bown, T. M. 1980b. Summary of latest Cretaceous and Cenozoic sedimentary, tectonic, and erosional events, Bighorn Basin, Wyoming, p. 25–32. In Gingerich, P. D. (ed.), Early Cenozoic Paleontology and Stratigraphy of the Bighorn Basin, Wyoming. University of Michigan Papers on Paleontology, 24.Google Scholar
Bown, T. M. 1981. “Evolutionary History of the Primates,” by Frederick S. Szalay and Eric Delson, 1979, Academic Press, New York, 580 p. (Review.) Journal of Vertebrate Paleontology, 1:117–119.Google Scholar
Bown, T. M. 1982. Geology, paleontology, and correlation of Eocene volcaniclastic rocks, southeast Absaroka Range, Hot Springs County, Wyoming. U.S. Geological Survey Professional Paper 1201-A, 75 p.CrossRefGoogle Scholar
Bown, T. M. 1984. Biostratigraphic significance of baselevel changes during deposition of the Willwood Formation (lower Eocene), Bighorn Basin, northwest Wyoming. Geological Society of America Annual Meeting, Abstracts with Programs, 16:216.Google Scholar
Bown, T. M. 1985. Maturation sequences in lower Eocene alluvial paleosols, Willwood Formation, p. 20–26. In Flores, R. M. and Harvey, M. (eds.), Field Guidebook to Modern and Ancient Fluvial Systems in the United States. Third International Fluvial Sedimentology Conference, Fort Collins, Colorado.Google Scholar
Bown, T. M. 1987. Vertebrate taphonomy and the mammalian pedofacies; Willwood Formation (lower Eocene), Bighorn Basin, Wyoming. Geological Society of America, 1987 Annual Meeting of Rocky Mountain Section, Symposium “Dawn of the Age of Mammals in the Northern Part of the Western Interior,” Abstracts with Programs, 19:262.Google Scholar
Bown, T. M. and Gingerich, P. D. 1972. Dentition of the early Eocene primates Niptomomys and Absarokius . Postilla, 158:1–10.Google Scholar
Bown, T. M., and Kihm, A. 1981. Xenicohippus, an unusual new hyracotheriine (Mammalia, Perissodactyla) from lower Eocene rocks of Wyoming, Colorado, and new Mexico. Journal of Paleontology, 55:257–270.Google Scholar
Bown, T. M., and Kraus, M. J. 1981a. Lower Eocene alluvial paleosols (Willwood Formation, northwest Wyoming, U.S.A.), and their significance for paleoecology, paleoclimatology, and basin analysis. Palaeogeography, Palaeoclimatology, Palaeoecology, 34:1–30.CrossRefGoogle Scholar
Bown, T. M., and Kraus, M. J. 1981b. Vertebrate fossil-bearing paleosol units (Willwood Formation, lower Eocene, northwest Wyoming, U.S.A.): implications for taphonomy, biostratigraphy, and assemblage analysis. Palaeogeography, Palaeoclimatology, Palaeoecology, 34:31–56.Google Scholar
Bown, T. M., and Kraus, M. J. 1987. Integration of channel and floodplain suites in aggrading alluvial systems: I. Developmental sequence and lateral relations of lower Eocene alluvial paleosols. Journal of Sedimentary Petrology, 57:587–601.Google Scholar
Bown, T. M., and Rose, K. D. 1984. Reassessment of some early Eocene Omomyidae, with description of a new genus and three new species. Folia Primatologica, 43:97–112.CrossRefGoogle Scholar
Bown, T. M., and Schankler, D. M. 1982. A review of the Proteutheria and Insectivora of the Willwood Formation (lower Eocene), Bighorn Basin, Wyoming. U.S. Geological Survey Bulletin, 1523, 79 p.Google Scholar
Branscomb, L. M. 1985. Integrity in science. American Scientist, 73:421–423.Google Scholar
Cartmill, M. 1980. The order Primates. Science, 208:720–721.CrossRefGoogle ScholarPubMed
Clemens, W. A., Lillegraven, J. A., Lindsay, E. H., and Simpson, G. G. 1979. Where, when, and what—a survey of known Mesozoic mammal distribution, p. 7–58. In Lillegraven, J. A., Kielan-Jaworowska, Z., and Clemens, W. A. (eds.), Mesozoic Mammals: The First Two-thirds of Mammalian History. University of California Press, Berkeley.Google Scholar
Cope, E. D. 1872. On a new vertebrate genus from the northern part of the Tertiary basin of Green River. Proceedings of the American Philosophical Society, 12:554.Google Scholar
Cope, E. D. 1882a. Contributions to the history of the Vertebrata of the lower Eocene of Wyoming and New Mexico, made during 1881. I. The fauna of the Wasatch beds of the basin of the Bighorn River. II. The fauna of the Catathlaeus beds, or lowest Eocene, New Mexico. Proceedings of the American Philosophical Society, 20:139–197.Google Scholar
Cope, E. D. 1882b. An anthropomorphous lemur. American Naturalist, 16:73–74.Google Scholar
Cope, E. D. 1883. On the mutual relations of the bunotherian Mammalia. Proceedings of the Philadelphia Academy of Natural Sciences, 35:77–83.Google Scholar
Cope, E. D. 1884. The Vertebrata of the Tertiary formations of the west. Book I. Report of U.S. Geological Survey of the Territories, Hayden, F. V., U.S. Geologist-in-charge, Washington, 1009 p.Google Scholar
Dashzeveg, D., and McKenna, M. C. 1977. Tarsioid primate from the early Tertiary of the Mongolian People's Republic. Acta Paleontologica Polonica, 22:119–137.Google Scholar
Delson, E. 1971. Fossil mammals of the early Wasatchian Powder River Local Fauna, Eocene of northeast Wyoming. American Museum of Natural History Bulletin, 146:305–364.Google Scholar
Eldredge, N. 1974. Testing evolutionary hypotheses in paleontology: a comment on Makurath and Anderson (1973). Evolution, 28:479–481.Google Scholar
Eldredge, N., and Gould, S. J. 1972. Punctuated equilibria: an alternative to phyletic gradualism, p. 82–115. In Schopf, T. J. M. (ed.), Models in Paleobiology. Freeman, Cooper, San Francisco.Google Scholar
Eldredge, N., and Gould, S. J. 1974. Morphological transformation, the fossil record, and the mechanisms of evolution: a debate, Part II, The reply. Evolutionary Biology, 7:303–308.Google Scholar
Gazin, C. L. 1952. The lower Eocene Knight Formation of western Wyoming and its mammalian faunas. Smithsonian Miscellaneous Collections, 117, 82 p.Google Scholar
Gazin, C. L. 1958. A review of the middle and upper Eocene primates of North America. Smithsonian Miscellaneous Collections, 136, 112 p.Google Scholar
Gazin, C. L. 1962. A further study of the lower Eocene mammalian faunas of southwestern Wyoming. Smithsonian Miscellaneous Collections, 144, 98 p.Google Scholar
Gazin, C. L. 1968. A study of the Eocene condylarthran mammal Hyopsodus . Smithsonian Miscellaneous Collections, 153, 90 p.Google Scholar
Gingerich, P. D. 1974a. Stratigraphic record of early Eocene Hyopsodus and the geometry of mammalian phylogeny. Nature, 248:107–109.Google Scholar
Gingerich, P. D. 1974b. Size variability of the teeth in living mammals and the diagnosis of closely related sympatric fossil species. Journal of Paleontology, 48:895–903.Google Scholar
Gingerich, P. D. 1976. Paleontology and phylogeny: patterns of evolution at the species level in early Tertiary mammals. American Journal of Science, 276:1–28.CrossRefGoogle Scholar
Gingerich, P. D. 1977a. Patterns of evolution in the mammalian fossil record, p. 469–500. In Hallam, A. (ed.), Patterns of Evolution. Elsevier, Amsterdam.Google Scholar
Gingerich, P. D. 1977b. Dental variation in early Eocene Teilhardina belgica, with notes on the anterior dentition of some early Tarsiiformes. Folia Primatologica, 26:144–153.Google Scholar
Gingerich, P. D. 1979. The stratophenetic approach to phylogeny reconstruction in vertebrate paleontology, p. 41–77. In Cracraft, J. and Eldredge, N. (eds.), Phylogenetic Analysis and Paleontology. Columbia University Press, New York.Google Scholar
Gingerich, P. D. 1980a. Evolutionary patterns in Early Cenozoic mammals. Annals of the Review of Earth and Planetary Sciences, 8:407–424.Google Scholar
Gingerich, P. D. 1980b. History of Early Cenozoic vertebrate paleontology in the Bighorn Basin, p. 7–24. In Gingerich, P. D. (ed.), Early Cenozoic Paleontology and Stratigraphy of the Bighorn Basin, Wyoming. University of Michigan Papers on Paleontology, 24.Google Scholar
Gingerich, P. D. 1981. Early Cenozoic Omomyidae and the evolutionary history of tarsiiform primates. Journal of Human Evolution, 10:345–374.Google Scholar
Gingerich, P. D. 1982. Time resolution in mammalian evolution: sampling, lineages, and faunal turnover. Proceedings of the Third North American Paleontological Convention, 1:205–210.Google Scholar
Gingerich, P. D. 1984. Punctuated equilibria—where is the evidence? Systematic Zoology, 33:335–338.Google Scholar
Gingerich, P. D. 1985. Species in the fossil record: concepts, trends, and transitions. Paleobiology, 11:27–41.CrossRefGoogle Scholar
Gingerich, P. D., and Gunnell, G. F. 1979. Systematics and evolution of the genus Esthonyx (Mammalia, Tillodontia) in the early Eocene of North America. Contributions from the Museum of Paleontology, University of Michigan, 25:125–153.Google Scholar
Gingerich, P. D., and Schoeninger, M. 1977. The fossil record and primate phylogeny. Journal of Human Evolution, 6:483–505.CrossRefGoogle Scholar
Gingerich, P. D., and Simons, E. L. 1977. Systematics, phylogeny, and evolution of early Eocene Adapidae (Mammalia, Primates) in North America. Contributions from the Museum of Paleontology, University of Michigan, 24:245–279.Google Scholar
Gingerich, P. D., and Winkler, D. A. 1979. Patterns of variation and correlation in the dentition of the red fox, Vulpes vulpes . Journal of Mammalogy, 60:691–704.Google Scholar
Godinot, M. 1982. Aspects nouveaux des échanges entre les faunes mammaliènnes d'Europe et d'Amérique du Nord à la base de l'Éocène. Géobios, Mémoire Spécial, 6:403–412.CrossRefGoogle Scholar
Gould, S. J. 1977. Ontogeny and Phylogeny. Harvard University Press, Cambridge, 501 p.Google Scholar
Gould, S. J. 1982. The meaning of punctuated equilibrium and its role in validating a hierarchical approach to macroevolution, p. 83–104. In Milkman, R. (ed.), Perspectives on Evolution. Sinauer Associates, Sunderland, Massachusetts.Google Scholar
Gould, S. J. 1983. Dix-huit points au sujet des équilibres ponctués, p. 39–41. In Chaline, J. (ed.), Modalités, rythmes, mécanismes de l'évolution biologique. Colloques Internationaux du Centre National de la Recherche Scientifique, No. 330, Paris.Google Scholar
Gould, S. J., and Eldredge, N. 1977. Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology, 3:115–151.CrossRefGoogle Scholar
Granger, W. 1914. On the names of lower Eocene faunal horizons of Wyoming and New Mexico. American Museum of Natural History Bulletin, 33:201–207.Google Scholar
Gregory, W. K. 1915. On the classification and phylogeny of the Lemuroidea. Geological Society of America Bulletin, 26:426–446.Google Scholar
Gregory, W. K. 1920. On the structure and relations of Notharctus, an American Eocene primate. Memoirs of the American Museum of Natural History, 3:53–243.Google Scholar
Guthrie, D. A. 1967. The mammalian fauna of the Lysite Member, Wind River Formation (early Eocene), of Wyoming. Southern California Academy of Sciences Memoirs, 5, 53 p.Google Scholar
Guthrie, D. A. 1971. The mammalian fauna of the Lost Cabin Member, Wind River Formation (lower Eocene), of Wyoming. Annals of the Carnegie Museum, 43:47–113.Google Scholar
Hecht, M. K. 1983. Microevolution, developmental processes, paleontology, and the origin of vertebrate higher categories. Colloques Internationaux du C.N.R.S., 330:289–294.Google Scholar
Hennig, W. 1966. Phylogenetic Systematics. University of Illinois Press, Urbana, 263 p.Google Scholar
Hickey, L. J. 1980. Paleocene stratigraphy and flora of the Clark's Fork Basin, p. 33–50. In Gingerich, P. D. (ed.), Early Cenozoic Paleontology and Stratigraphy of the Bighorn Basin, Wyoming. University of Michigan Papers on Paleontology, 24.Google Scholar
Jepsen, G. L. 1930. New vertebrate fossils from the lower Eocene of the Bighorn Basin, Wyoming. Proceedings of the American Philosophical Society, 69:117–131.Google Scholar
Jepsen, G. L. 1963. Eocene vertebrates, coprolites, and plants in the Golden Valley Formation of western North Dakota. Geological Society of America Bulletin, 74:673–684.Google Scholar
Kay, R. F. 1980. Paleoprimatology—documenting our antecedents. Paleobiology, 6:517–520.Google Scholar
Kelley, D. R., and Wood, A. E. 1954. The Eocene mammals from the Lysite Member, Wind River Formation of Wyoming. Journal of Paleontology, 28:337–366.Google Scholar
Kitts, D. B. 1956. American Hyracotherium (Perissodactyla, Equidae). American Museum of Natural History Bulletin, 110, 60 p.Google Scholar
Kraus, M. J., and Bown, T. M. 1986. Paleosols and time resolution in alluvial stratigraphy, p. 180–207. In Wright, P. V. (ed.), Paleosols: Their Classification, Recognition, and Significance. Blackwell, London.Google Scholar
Krause, D. W. 1982. Multituberculates from the Wasatchian Land-Mammal Age, early Eocene, of Western North America. Journal of Paleontology, 56:271–294.Google Scholar
Krishtalka, L. 1978. Szalay, Frederick Sigmond, “Systematics of the Omomyidae (Tarsiiformes, Primates); Taxonomy, Phylogeny, and Adaptations,” Bulletin of the American Museum of Natural History, 156:157–450. (Review.) Journal of Mammalogy, 59:901–903.Google Scholar
Krishtalka, L., and Schwartz, J. H. 1978. Phylogenetic relationships of plesiadapiform-tarsiiform primates. Annals of the Carnegie Museum, 47:515–540.Google Scholar
Krishtalka, L., and Stucky, R. K. 1985. Revision of the Wind River faunas, early Eocene of central Wyoming. Part 7. Revision of Diacodexis (Mammalia, Artiodactyla). Annals of the Carnegie Museum, 54:413–486.Google Scholar
Lazarus, D.B., and Prothero, D. R. 1984. The role of stratigraphic and morphologic data in phylogeny. Journal of Paleontology, 58:163–172.Google Scholar
Lillegraven, J. A., McKenna, M. C., and Krishtalka, L. 1981. Evolutionary relationships of middle Eocene and younger species of Centetodon (Mammalia, Insectivora, Geolabididae) with a description of the dentition of Ankylodon (Adapisoricidae). University of Wyoming Publications, 45, 115 p.Google Scholar
Loomis, F. B. 1906. Wasatch and Wind River primates. American Journal of Science, ser. 4, 21:277–285.CrossRefGoogle Scholar
Loomis, F. B. 1907. Origin of the Wasatch deposits. American Journal of Science, ser. 4, 23:356–364.CrossRefGoogle Scholar
Love, J. D. 1939. Geology along the southern margin of the Absaroka Range, Wyoming. Geological Society of America Special Paper 20, 133 p.Google Scholar
Luckett, W. P., and Maier, M. 1982. Development of deciduous and permanent dentition in Tarsius and its phylogenetic significance. Folia Primatologica, 37:1–36.CrossRefGoogle ScholarPubMed
MacDonald, J. R. 1963. The Miocene faunas from the Wounded Knee area of western South Dakota. American Museum of Natural History Bulletin, 125:139–238.Google Scholar
Maglio, V. J. 1973. Origin and evolution of the Elephantidae. Transactions of the American Philosophical Society, n. ser., 63, 149 p.Google Scholar
Martin, L. D. 1984. Phyletic trends and evolutionary rates. Special Publications of the Carnegie Museum of Natural History, 8:526–538.Google Scholar
Matthew, W. D. 1915. A revision of the lower Eocene Wasatch and Wind River faunas. Part IV. Entelonychia, Primates, Insectivora (part). American Museum of Natural History Bulletin, 34:429–483.Google Scholar
Mayr, E. 1942. Systematics and the Origin of Species. Columbia University Press, New York. 433 p.Google Scholar
McKenna, M. C. 1960. Fossil Mammalia from the early Wasatchian Four Mile Fauna, Eocene of northwest Colorado. University of California Publications in Geological Sciences, 37:1–130.Google Scholar
McKenna, M. C. 1975. Toward a phylogenetic classification of the Mammalia, p. 21–46. In Luckett, W. P. and Szalay, F. S. (eds.), Phylogeny of the Primates. Plenum, New York.Google Scholar
Morris, W. J. 1954. An Eocene fauna from the Cathedral Bluffs Tongue of the Washakie Basin, Wyoming. Journal of Paleontology, 28:195–203.Google Scholar
Musser, G. G., and Dagosto, M. 1987. The identity of Tarsius pumilus, a pygmy species endemic to the montane mossy forests of central Suelawesi. American Museum of Natural History Novitates, 2867, 53 p.Google Scholar
Neasham, J. W. 1970. Sedimentology of the Willwood Formation (lower Eocene): an alluvial molasse facies in northwestern Wyoming. Unpubl. Ph.D. dissertation, Iowa State University, Ames, 98 p.Google Scholar
Novacek, M. J. 1986. The primitive eutherian dental formula. Journal of Vertebrate Paleontology, 6:191–196.Google Scholar
Osborn, H. F. 1902. American Eocene primates, and the supposed rodent family Mixodectidae. American Museum of Natural History Bulletin, 16:169–214.Google Scholar
Patterson, C. 1981. The significance of fossils in determining evolutionary relationships. Annual Review of Ecology and Systematics, 12: 195–223.Google Scholar
Penny, D. 1985. Two hypotheses on Darwin's gradualism. Systematic Zoology, 34:201–205.Google Scholar
Quinet, G. E. 1966. Teilhardina belgica, ancêtre des Anthropoidea de l'ancien monde. Institut Royal des Sciences Naturelles de Belgique Bulletin, 42:1–14.Google Scholar
Robinson, P. 1966. Fossil Mammalia of the Huerfano Formation, Eocene, of Colorado. Peabody Museum of Natural History (Yale) Bulletin, 21:1–95.Google Scholar
Robinson, P. 1967. The mandibular dentition of ?Tetonoides (Primates, Anaptomorphidae). Annals of the Carnegie Museum, 39:187–191.Google Scholar
Rose, K. D. 1972. A new tillodont from the Eocene upper Willwood Formation of Wyoming. Postilla, 155:1–13.Google Scholar
Rose, K. D. 1981a. “Evolutionary History of the Primates,” by Frederick S. Szalay and Eric Delson, 1979: Academic Press, New York, 580 p. (Review.) Journal of Paleontology, 55:910–913.Google Scholar
Rose, K. D. 1981b. The Clarkforkian Land Mammal Age and mammalian faunal composition across the Paleocene-Eocene boundary. University of Michigan Papers on Paleontology, 26, 197 p.Google Scholar
Rose, K. D., and Bown, T. M. 1984. Gradual phyletic evolution at the generic level in early Eocene omomyid primates. Nature, 309:250–252.Google Scholar
Rose, K. D., and Bown, T. M. 1986. Gradual evolution and species discrimination in the fossil record, p. 119–130. In Flanagan, K. and Lillegraven, J. A. (eds.), Vertebrates, Phylogeny, and Philosophy. University of Wyoming Contributions to Geology Special Paper, 3.Google Scholar
Rose, K. D., and Krause, D. W. 1984. Affinities of the primate Altanius from the early Tertiary of Mongolia. Journal of Mammalogy, 65:721–726.Google Scholar
Rosen, D. E., Forey, P. L., Gardiner, B. G., and Patterson, C. 1981. Lungfishes, tetrapods, paleontology, and plesiomorphy. Bulletin of the American Museum of Natural History, 167:159–276.Google Scholar
Russell, D. E., and Gingerich, P. D. 1980. Un nouveau Primate omomyide dans l'Éocene du Pakistan. Comptes Rendus de l'Académie des Sciences, Paris, 291:621–624.Google Scholar
Russell, D. E., Louis, P., and Savage, D. E. 1967. Primates of the French early Eocene. University of California Publications in the Geological Sciences, 93, 46 p.Google Scholar
Sadler, P. M. 1981. Sediment accumulation rates and the completeness of stratigraphic sections. Journal of Geology, 89:569–584.CrossRefGoogle Scholar
Savage, D. E., and Hutchison, J. H. 1972. Wasatchian succession at Bitter Creek Station, northwestern border of the Washakie Basin, Wyoming, p. 32–39. In West, R. M. (ed.), Society of Vertebate Paleontology Field Conference on Tertiary Biostratigraphy of Southern and Western Wyoming. (Privately distributed to field conference members in mimeographed form.).Google Scholar
Savage, D. E., and Waters, B. T. 1978. A new omomyid primate from the Wasatch Formation of southern Wyoming. Folia Primatologica, 30:1–29.Google Scholar
Savage, D. E., Russell, D. E., and Waters, B. T. 1977. Critique of certain early Eocene primate taxa. Géobios, Mémoire Spécial, 1:159–164.Google Scholar
Schaffer, B., Hecht, M. K., and Eldredge, N. 1972. Paleontology and phylogeny. Evolutionary Biology, 6:31–46.Google Scholar
Schankler, D. M. 1980. Faunal zonation of the Willwood Formation in the central Bighorn Basin, Wyoming, p. 99–114. In Gingerich, P. D. (ed.), Early Cenozoic Paleontology and Stratigraphy of the Bighorn Basin, Wyoming. University of Michigan Papers on Paleontology, 24.Google Scholar
Schankler, D. M. 1981. Local extinction and ecological reentry of early Eocene mammals. Nature, 293:135–138.Google Scholar
Schopf, T. J. M. 1982. A critical assessment of punctuated equilibria, I. Duration of taxa. Evolution, 36:1144–1157.Google Scholar
Schwartz, J. H. 1978. Dental development, homologies, and primate phylogeny. Evolutionary Theory, 4:1–32.Google Scholar
Seton, H. 1940. Two new primates from the lower Eocene of Wyoming. Proceedings of the New England Zoological Club, 18:39–42.Google Scholar
Simons, E. L. 1972. Primate Evolution: An Introduction to Man's Place in Nature. Macmillan, New York, 322 p.Google Scholar
Simons, E. L., and Bown, T. M. 1985. Afrotarsius chatrathi, first tarsiiform primate (?Tarsiidae) from Africa. Nature, 313:475–477.Google Scholar
Simons, E. L., Bown, T. M., and Rasmussen, D. T. 1986. Discovery of two additional prosimian primate families (Omomyidae, Lorisidae) in the African Oligocene. Journal of Human Evolution, 15: 431–437.Google Scholar
Simpson, G. G. 1940. Studies on the earliest primates. American Museum of Natural History Bulletin, 77:185–212.Google Scholar
Simpson, G. G. 1943. Criteria for genera, species and subspecies in zoology and paleozoology. Annals of the New York Academy of Science, 44:145–178.Google Scholar
Sinclair, W.J., and Granger, W. 1911. Eocene and Oligocene of the Wind River and Bighorn Basins. American Museum of Natural History Bulletin, 30:83–117.Google Scholar
Sinclair, W.J., 1912. Notes on the Tertiary deposits of the Bighorn Basin. American Museum of Natural History Bulletin, 31:57–67.Google Scholar
Smedes, H. W., and Prostka, H. J. 1972. Stratigraphic framework of the Absaroka Volcanic Supergroup in the Yellowstone National Park Region. U.S. Geological Survey Professional Paper, 729-C:1–33.Google Scholar
Stanley, S. M. 1982. Macroevolution and the fossil record. Evolution, 36:460–473.Google Scholar
Stanley, S. M. 1985. Rates of evolution. Paleobiology, 11:13–26.Google Scholar
Stucky, R. K. 1982. Mammalian fauna and biostratigraphy of the upper part of the Wind River Formation (early to middle Eocene), Natrona County, Wyoming, and the Wasatchian-Bridgerian boundary. Unpubl. Ph.D. dissertation, University of Colorado, Department of Anthropology, Boulder, 285 p.Google Scholar
Swindler, D. R. 1976. Dentition of Living Primates. Academic Press, New York, 308 p.Google Scholar
Szalay, F. S. 1969. Uintasoricinae, a new subfamily of early Tertiary mammals. American Museum Novitates, 2363, 36 p.Google Scholar
Szalay, F. S. 1976. Systematics of the Omomyidae (Tarsiiformes, Primates), taxonomy, phylogeny, and adaptations. American Museum of Natural History Bulletin, 156:157–450.Google Scholar
Szalay, F. S. 1982. A critique of some recently proposed Paleogene primate taxa and suggested relationships. Folia Primatologica, 37:153–162.Google Scholar
Szalay, F. S., and Delson, E. 1979. Evolutionary History of the Primates. Academic Press, New York, 580 p.Google Scholar
Szalay, F. S., and Li, C. K. 1986. Middle Paleocene euprimate from southern China and the distribution of primates in the Paleogene. Journal of Human Evolution, 15:387–397.Google Scholar
de Chardin, P. Teilhard 1927. Les mammifères de l'Éocène inférieur de la Belgique. Mémoires du Musée Royal d'Histoire Naturelle de Belgique, 36:1–33.Google Scholar
Trouessart, E. L. 1879. Catalogue des Mammifères vivants et fossiles. Revue Magazine de Zoologie, 7:219–285.Google Scholar
Van Hinte, J. E. 1969. The nature of biostratigraphic zones, p. 391–424. In Proceedings of the International Conference on Planktonic Microfossils, 1st, Geneva, 1967, 2. E. J. Brill, Leiden.Google Scholar
Van Houten, F. B. 1944. Stratigraphy of the Willwood and Tatman Formations in northwestern Wyoming. Geological Society of America Bulletin, 55:165–210.Google Scholar
West, R. M. 1979. Apparent prolonged evolutionary stasis in the middle Eocene hoofed mammal Hyopsodus . Paleobiology, 5:252–260.Google Scholar
Wilson, J. A. 1966. A new primate from the earliest Oligocene, West Texas, preliminary report. Folia Primatologica, 4:227–248.Google Scholar
Wing, S. L. 1980. Fossil floras and plant-bearing beds of the central Bighorn Basin, p. 119–126. In Gingerich, P. D. (ed.), Early Cenozoic Paleontology and Stratigraphy of the Bighorn Basin. University of Michigan Papers on Paleontology, 24.Google Scholar
Wing, S. L. 1984. Relation of paleovegetation to geometry and cyclicity of some fluvial carbonaceous deposits. Journal of Sedimentary Petrology, 54:52–66.Google Scholar
Wing, S. L. and Bown, T. M. 1985. Fine scale reconstruction of late Paleocene-early Eocene paleogeography in the Bighorn Basin of northern Wyoming, p. 93–106. In Flores, R. M. and Kaplan, S. S. (eds.), Cenozoic Paleogeography of the West-central United States. Society of Economic Paleontologists and Mineralogists Rocky Mountain Paleogeography Symposium 3, Silers, Denver.Google Scholar
Winterfeld, G. V. 1986. Laramide tectonism, deposition, and early Cenozoic stratigraphy of the northwestern Wind River Basin and Washakie Range, Wyoming. Unpubl. Ph.D. dissertation, University of Wyoming, Laramie, 248 p.Google Scholar
Wood, H. E. II, Chaney, R. W., Clark, J., Colbert, E. H., Jepsen, G. L., Reeside, J. B. Jr., and Stock, C. 1941. Nomenclature and correlation of the North American continental Tertiary. Geological Society of America Bulletin, 52:1–48.Google Scholar
Wortman, J. L. 1904. Studies of Eocene Mammalia in the Marsh collection, Peabody Museum. Part II. Primates. American Journal of Science, 17:239–250.Google Scholar
Wright, S. 1948. On the roles of directed and random changes in gene frequency in the genetics of populations. Evolution, 2:279–294.Google Scholar
Wyoming Geological Association. 1968. Tertiary well logs in all Wyoming basins (Log #4, Washakie County, Gulf Oil Corporation, #1 Teeters).Google Scholar
Xu, Q. 1977. Two new genera of old Ungulata from the Paleocene of Qianshan Basin, Anhui. Vertebrata PalAsiatica, 15:119–125.Google Scholar