Dragon Canyon: Torrejonian, Utah

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Actinopteri - Lepisosteiformes - Lepisosteidae
cf. Lepisosteus sp. Agassiz 1843
Robison 1986
Mammalia - Multituberculata - Taeniolabididae
Catopsalis utahensis n. sp. Gazin 1939
Gazin 1939
(1 measurement)
    = Catopsalis fissidens Cope 1884
Alroy 2002
new specimens from Dragon Canyon reported by Robison 1986
Mammalia - Multituberculata - Neoplagiaulacidae
Neoplagiaulax macintyrei Sloan 1981
Robison 1986
Parectypodus sp. Jepsen 1930
Tomida and Butler 1980
Mammalia - Multituberculata - Ptilodontidae
Ptilodontidae indet. Cope 1887
Robison 1986
Ptilodus ferronensis n. sp. Gazin 1941
Gazin 1941
    = Ptilodus mediaevus Cope 1881
Alroy 2002
"? Ptilodus sp." of Robison
Mammalia - Marsupialia
Didelphidae indet. Gray 1821
Tomida and Butler 1980
    = Marsupialia indet. Illiger 1811
Alroy 2002
Mammalia
Bryanictis sp. MacIntyre 1966
Tomida and Butler 1980
    = Eutheria indet. Huxley 1880
Williamson 1996
Robison 1986; could be Intyrictis or even a palaeoryctid
Mammalia - Pantolestidae
Pantolestidae indet. Cope 1884
Tomida and Butler 1980
two forms
Mammalia - Procreodi - Arctocyonidae
Protogonodon biatheles n. sp.
Gazin 1941
synonym of Loxolophus
? Protogonodon spiekeri n. sp. Gazin 1938
(1 measurement)
    = Loxolophus spiekeri Gazin 1938
Tomida and Butler 1980
? Chriacus sp. Cope 1883
includes "C. truncatus" and additional "C. sp." of Robison 1986 according to Williamson 1996
    = Chriacus cf. baldwini Cope 1882
Tomida and Butler 1980
Oxyclaenus pearcei n. sp. Gazin 1941
Gazin 1941
synonym of Chriacus baldwini
Mimotricentes subtrigonus (Cope 1881)
Tomida and Butler 1980
recombined as Tricentes subtrigonus
probably also includes additional M. sp. of Robison 1986
Mimotricentes elassus n. sp. (Gazin 1941)
Gazin 1941
synonym of Tricentes subtrigonus
(1 measurement)
Oxytomodon perissum n. gen., n. sp. Gazin 1941
Gazin 1941
Mammalia - Periptychidae
Periptychus gilmorei Gazin 1938
(5 measurements)
    = Periptychus carinidens Cope 1881
Alroy 2002
Anisonchus onostus Gazin 1939
Gazin 1939
"probably" includes "A. cf. oligistus": Williamson 1996 (1 measurement)
Anisonchus dracus n. sp. Gazin 1939
Gazin 1939
(1 measurement)
    = Anisonchus sectorius Cope 1881
Alroy 2002
Mammalia - Viverravidae
Protictis haydenianus (Cope 1882)
Tomida and Butler 1980
Mammalia - Acreodi - Triisodontidae
Goniacodon sp. Scott 1892
Tomida and Butler 1980
Mammalia - Primates - Palaechthonidae
Palaechthon sp. Gidley 1923
Tomida and Butler 1980
    = Plesiolestes nacimienti Wilson and Szalay 1972
Gunnell 1989
"? Palaechthon sp." of Robison 1986
Mammalia - Primates - Paromomyidae
Paromomys cf. depressidens Gidley 1923
Tomida and Butler 1980
    = Paromomys depressidens Gidley 1923
Gunnell 1989
replaces ID of Robison 1986
Mammalia - Primates - Picrodontidae
Draconodus apertus Tomida 1982
Tomida 1982
Mammalia - Mixodectidae
Mixodectidae indet. Cope 1883
Tomida and Butler 1980
Dracontolestes aphantus n. sp. Gazin 1941
Tomida and Butler 1980
Mammalia - Condylarthra - Hyopsodontidae
Promioclaenus sp. Trouessart 1904
Robison 1986
Promioclaenus lemuroides (Matthew 1897)
Robison 1986
according to Williamson 1996, this definitely includes "Ellipsodon shepherdi" type of Gazin 1939 and "Jepsenia mantiensis" type of Gazin 1939, and probably includes Robison's "Litaletes disjunctus"
Ellipsodon grangeri Wilson 1956
Robison 1986
may include additional "? Ellipsodon sp." of Tomida and Butler 1980
? Ellipsodon sternbergi n. sp. Gazin 1939
Gazin 1939
Dracoclaenus griphus n. gen., n. sp. Gazin 1939
Gazin 1939
(1 measurement)
    = Protoselene griphus Gazin 1939
Tomida and Butler 1980
Mammalia - Leptictidae
Myrmecoboides sp. Gidley 1915
Robison 1986
said to be new
Tomida and Butler 1980
Mammalia
Conoryctella pattersoni Schoch and Lucas 1981
Schoch and Lucas 1981
(1 measurement)
Conoryctella dragonensis n. gen., n. sp. Gazin 1939
Gazin 1939
(3 measurements)
Mammalia - Stylinodontidae
Psittacotherium sp. Cope 1882
Tomida and Butler 1980
    = Stylinodontidae indet. Marsh 1875
Schoch 1986
"P. multifragum" of Rigby 1980
Mammalia - Pentacodontidae
Aphronorus simpsoni n. sp. Gazin 1938
(1 measurement)
Reptilia - Champsosauridae
Champsosauridae indet. Cope 1876
Gazin 1939
"champsosaurid"; not described and omitted by Robison 1986
Reptilia - Crocodylia
cf. Leidyosuchus sp. Lambe 1907
Robison 1986
    = Crocodylia indet. Owen 1842
Alroy 2007
Reptilia
Crocodylia indet. (Owen 1842)
"crocodile"; not described
    = cf. Allognathosuchus sp. Mook 1921
Robison 1986
one of two crocs, arbitrarily chosen to be the reidentification
Reptilia - Anguidae
Anguidae indet. Gray 1825
Robison 1986
cf. Proxestops jepseni (Gilmore 1942)
Robison 1986
synonym of Proxestops silberlingii
see also Gilmore 1942 (UNSM specimens from "the Dragon formation... in the Manti National Forest")
Reptilia
Compsemys victa (Leidy 1856)
Robison 1986
Reptilia - Testudines - Trionychidae
Robison 1986
    = Trionychidae indet. Gray 1825
Alroy 2006
Reptilia - Testudines - Kinosternoidea
Hoplochelys sp. Hay 1908
Robison 1986
see common names

Geography
Country:United States State/province:Utah County:Emery
Coordinates: 39.2° North, 111.3° West (view map)
Paleocoordinates:46.2° North, 90.8° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Paleocene
10 m.y. bin:Cenozoic 1
*Period:Tertiary
Key time interval:Torrejonian
Age range of interval:63.80000 - 60.90000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:North Horn Member:Joe's Valley
Local section:NHorn Local bed:4
Local order:bottom to top
Stratigraphic resolution:group of beds
Stratigraphy comments: close to the top of a normal magnetic polarity zone interpreted as C28n, but there is no tie point in the section: see Lucas et al. 1997
Lithology and environment
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Taxonomic list comments:firmly correlated with Wagonroad Upper Horizon, which was included in the list of Tomida and Butler 1980; paleomagnetic data strongly support a correlation between the two horizons
descriptions of Robison 1986 do not incorporate the collections reported by Tomida and Butler and Tomida 1982
"Oxyclaenus pearcei" is not discussed by Robison 1986 and I assume it is only present at Wagonroad Upper Horizon

Haploconus "inopinatus" is not discussed by Robison 1986 and I assume it is only present at Wagonroad Upper Horizon
Metadata
Also known as:Gazin's Locality 2; OMNH V799; UALP 76111, 76112, 7776
Database number:14830
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Modifier:J. Alroy Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2007-11-16 15:18:38
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
6618. C. L. Gazin. 1938. A Paleocene mammalian fauna from central Utah. Journal of the Washington Academy of Sciences 28(6):271-277 [J. Alroy/J. Alroy/J. Alroy]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
18120 J. Alroy. 2006. Synonymies and reidentifications of North American fossil vertebrates. [J. Alroy/J. Alroy/J. Alroy]
19636 J. Alroy. 2007. Synonymies and reidentifications of North American fossil vertebrates and so forth. [J. Alroy/J. Alroy]
6619 C. L. Gazin. 1939. A further contribution to the Dragon Paleocene fauna of central Utah. Journal of Washington Academy of Sciences 29(7):273-286 [J. Alroy/J. Alroy/M. Carrano]
82650 C. L. Gazin. 1941. The mammalian faunas of the Paleocene of central Utah, with notes on the geology. Proceedings of the United States National Museum 91(3121):1-53 [J. Marcot/J. Marcot]
1730 G. F. Gunnell. 1989. Evolutionary History of Microsyopoidea (Mammalia, ?Primates) and the Relationship Between Plesiadapiformes and Primates. University of Michigan Papers on Paleontology 27:1-157 [J. Alroy/J. Alroy/P. Mannion]
2319 S. G. Lucas, T. E. Williamson, and M. D. Middleton. 1997. Catopsalis (Mammalia: Multituberculata) from the Paleocene of New Mexico and Utah: taxonomy and biochronological significance. Journal of Paleontology 71(3):484-492. [J. Alroy/J. Alroy/K. Maguire]
9611 M. C. McKenna and D. L. Lofgren. 2003. Mimotricentes tedfordi, a new arctocyonid from the late Paleocene of California. Bulletin of the American Museum of Natural History 279:632-643 [J. Alroy/J. Alroy/J. Alroy]
2930 S. F. Robison. 1986. Paleocene (Puercan-Torrejonian) mammalian faunas of the North Horn Formation, central Utah. Brigham Young University Geology Studies 33(1):87-133 [J. Alroy/J. Alroy]
3053 R. M. Schoch. 1986. Systematics, Functional Morphology and Macroevolution of the Extinct Mammalian Order Taeniodonta. Peabody Museum of Natural History Bulletin 42:1-320 [J. Alroy/J. Alroy/M. Uhen]
3058 R. M. Schoch and S. G. Lucas. 1981. A new species of Conoryctella (Mammalia: Taeniodonta) from the Paleocene of the San Juan Basin, New Mexico, and a revision of the genus. Postilla 185:1-23 [J. Alroy/J. Alroy/J. Ju]
3435 Y. Tomida. 1982. A New Genus of Picrodontid Primate from the Paleocene of Utah. Folia Primatologica 37 [J. Alroy/J. Alroy/J. Ju]
3436 Y. Tomida and R. F. Butler. 1980. Dragonian mammals and Paleocene magnetic polarity stratigraphy, North Horn Formation, central Utah. American Journal of Science 280:787-811 [J. Alroy/J. Alroy/P. Mannion]
3489 L. M. Van Valen and R. E. Sloan. 1965. The earliest primates. Science 150(3697):743-745 [J. Alroy/J. Alroy/M. Carrano]
3646 T. E. Williamson. 1996. The beginning of the age of mammals in the San Juan Basin, New Mexico; biostratigraphy and evolution of Paleocene mammals of the Nacimiento Formation. New Mexico Museum of Natural History and Science Bulletin 8:1-141 [J. Alroy/J. Alroy/P. Mannion]