Dragon Canyon (Paleocene of the United States)

Also known as Gazin's Locality 2; OMNH V799; UALP 76111, 76112, 7776

Where: Emery County, Utah (39.2° N, 111.3° W: paleocoordinates 46.2° N, 90.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Joe's Valley Member (North Horn Formation), Torrejonian (63.3 - 61.7 Ma)

• 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

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial

Size classes: macrofossils, mesofossils

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 14830: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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
Actinopteri
 Lepisosteiformes - Lepisosteidae
cf. Lepisosteus sp.6 Agassiz 1843 gar
Reptilia
 Testudines - Trionychidae
Trionychidae indet.2 Gray 1825 softshell turtle
 Testudines -
Compsemys victa6 Leidy 1856 turtle
 Testudines - Kinosternoidea
Hoplochelys sp.6 Hay 1908 mud turtle
 Loricata -
Crocodylia indet.3 crocodilian
 Crocodylia - Alligatoridae
cf. Allognathosuchus sp.6 Mook 1921 crocodilian
"crocodile"; not described
 Squamata - Anguidae
Anguidae indet.6, "cf. Proxestops jepseni" = Proxestops silberlingii6
Anguidae indet.6 Gray 1825 squamates
"cf. Proxestops jepseni" = Proxestops silberlingii6 Gilmore 1938 squamates
see also Gilmore 1942 (UNSM specimens from "the Dragon formation... in the Manti National Forest")
 Choristodera - Champsosauridae
Champsosauridae indet.4 Cope 1876 champsosaur
"champsosaurid"; not described and omitted by Robison 1986
Mammalia
 Primates - Picrodontidae
Draconodus apertus9 Tomida 1982 primate
 Primates - Paromomyidae
Paromomys depressidens5 Gidley 1923 primate
 Primates - Palaechthonidae
Plesiolestes nacimienti5 Wilson and Szalay 1972 primate
 Tribosphenida -
Eutheria indet.12 eutherian
 Cimolesta - Cimolestidae
Acmeodon sp.10 Matthew and Granger 1921 eutherian
 Cimolesta - Pantolestidae
Pantolestidae indet.10 Cope 1884 eutherian
two forms
 Cimolesta - Pentacodontidae
Aphronorus simpsoni1 Gazin 1938 eutherian
 Leptictida - Leptictidae
Myrmecoboides sp.6 Gidley 1915 eutherian
said to be new
 Ferae - Viverravidae
Protictis haydenianus10 Cope 1882 placental
 Taeniodonta - Conoryctidae
Conoryctella dragonensis n. gen. n. sp.4 Gazin 1939 taeniodont
Conoryctella pattersoni8 Schoch and Lucas 1981 taeniodont
 Taeniodonta - Stylinodontidae
 Tribosphenida - Arctocyonidae
Oxytomodon perissum10, Loxolophus spiekeri10, "Mimotricentes subtrigonus" = Tricentes subtrigonus10, "Mimotricentes elassus n. sp." = Tricentes subtrigonus11, Chriacus cf. baldwini10, Desmatoclaenus hermaeus1
Oxytomodon perissum10 Gazin 1941 condylarth
Loxolophus spiekeri10 Gazin 1938 condylarth
includes "L. biatheles" of Tomida and Butler 1980
"Mimotricentes subtrigonus" = Tricentes subtrigonus10 Cope 1881 condylarth
probably also includes additional M. sp. of Robison 1986
"Mimotricentes elassus n. sp." = Tricentes subtrigonus11 Cope 1881 condylarth
Chriacus cf. baldwini10 Cope 1882 condylarth
includes "C. truncatus" and additional "C. sp." of Robison 1986 according to Williamson 1996
Desmatoclaenus hermaeus1 Gazin 1941 condylarth
 Ungulata - Hyopsodontidae
? Ellipsodon sternbergi n. sp.4 Gazin 1939 condylarth
Ellipsodon grangeri6 Wilson 1956 condylarth
may include additional "? Ellipsodon sp." of Tomida and Butler 1980
"Promioclaenus lemuroides" = Ellipsodon lemuroides6 Matthew 1897 condylarth
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"
Promioclaenus sp.6 Trouessart 1904 condylarth
Protoselene griphus10 Gazin 1939 condylarth
 Ungulata - Periptychidae
Periptychus carinidens1 Cope 1881 condylarth
Anisonchus onostus4 Gazin 1939 condylarth
"probably" includes "A. cf. oligistus": Williamson 1996
Anisonchus sectorius1 Cope 1881 condylarth
 Insectivora - Mixodectidae
Mixodectidae indet.10 Cope 1883 insectivoran
Dracontolestes aphantus n. sp.10 Gazin 1941 insectivoran
 Acreodi - Triisodontidae
Goniacodon sp.10 Scott 1892 eutherian
 Theriiformes - Marsupialia
 Multituberculata - Neoplagiaulacidae
Parectypodus sp.10 Jepsen 1930 multituberculate
Neoplagiaulax macintyrei6 Sloan 1981 multituberculate
 Multituberculata - Ptilodontidae
Ptilodontidae indet.6 Cope 1887 multituberculate
Ptilodus mediaevus1 Cope 1881 multituberculate
 Multituberculata - Taeniolabididae
Catopsalis fissidens1 Cope 1884 multituberculate