Split Rock (UCMP V-69190): Hemingfordian, Wyoming

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Pleurodonta indet.
Scarpetta 2021
Peridiomys sp. Matthew 1924
    = Mioheteromyinae indet.
Alroy 2002
Reptilia - Anguidae
Gerrhonotus sp. Wiegmann 1828
Munthe 1979
    = Gerrhonotinae indet. Cope 1864
Scarpetta 2018
Elgaria sp. Gray 1838
Scarpetta 2018 1 specimen
Reptilia - Colubridae
Pseudocemophora cf. antiqua
Munthe 1979
Ameiseophis robinsoni Holman 1976
Munthe 1979
Paracoluber storeri Holman 1970
Munthe 1979
Salvadora paleolineata Holman 1973
Munthe 1979
Reptilia
Caeruleodentatus lovei n. gen., n. sp. Scarpetta 2021
Scarpetta 2021 1 specimen
Reptilia - Phrynosomatidae
Phrynosomatidae indet. Fitzinger 1843
Scarpetta 2021
"Sceloporine morphotype" and "sand lizard morphotype", a reidentification of some ? Sceloporus sp.
Reptilia - Iguanidae
Phrynosoma ? douglassi
Munthe 1979
Reptilia - Crotaphytidae
? Sceloporus sp. Wiegmann 1828
Munthe 1979
    = Crotaphytidae indet. Frost and Etheridge 1989
Scarpetta 2021
"Crotaphytidae incertae sedis Dentary morphotype 1"
Reptilia - Testudines - Testudinidae
Gopherus cf. edae (Hay 1906)
Munthe 1979
Mammalia - Rodentia - Sciuridae
Miospermophilus wyomingensis Black 1963
Tamias sp. Illinger 1811
    = cf. Nototamias sp. Pratt and Morgan 1989
Sutton and Korth 1995
"may be" this genus; Lindsay 1972 considers this close to N. ateles, but Sutton 1972 compares it to the Thomas Farm form
Protospermophilus kelloggi Black 1963
Mammalia - Rodentia - Zapodidae
Plesiosminthus sabrae (Black 1958)
original and current combination Schaubeumys sabrae
Mammalia - Rodentia
Proheteromys sp. Wood 1932
    = Geomyoidea indet. Bonaparte 1845
Alroy 2002
Mammalia - Rodentia - Heteromyidae
Schizodontomys harkseni (Macdonald 1970)
Harrymys irvini Munthe 1988
(6 measurements)
Perognathus sp. Maximillian 1839
    = Perognathinae indet. Coues 1875
Alroy 2002
doubtful Munthe was aware of Martin 1984
Mammalia - Rodentia - Mylagaulidae
Mesogaulus novellus (Matthew 1924)
recombined as Galbreathia novellus
Mesogaulus vetus (Matthew 1924)
recombined as Alphagaulus vetus
confirmed by Korth 2000d
Mammalia - Lagomorpha - Leporidae
? Desmatolagus schizopetrus Dawson 1965
Hypolagus sp. Dice 1917
    = Archaeolaginae indet.
Alroy 2002
Mammalia - Lagomorpha - Ochotonidae
Oreolagus nebrascensis McGrew 1941
Mammalia - Erinaceidae
Brachyerix macrotis Matthew 1933
Mammalia - Proscalopidae
Mesoscalops scopelotemos Reed 1960
Mammalia - Carnivora - Mustelidae
Mustelidae indet. Fischer 1817
Mammalia - Carnivora - Canidae
Tomarctus sp. Cope 1873
    = Borophaginae indet. Simpson 1945
Alroy 2002
Tomarctus kelloggi (Merriam 1911)
recombined as Paracynarctus kelloggi
confirmed by Wang et al. 1999
Tomarctus optatus Matthew 1924
recombined as Protomarctus optatus
confirmed by Wang et al. 1999
Cynarctoides acridens (Barbour and Cook 1914)
confirmed by Wang et al. 1999
Mammalia - Merycoidodontidae
Brachycrus sweetwaterensis Schultz and Falkenbach 1940
synonym of Brachycrus laticeps
Brachycrus vaughani Schultz and Falkenbach 1940
synonym of Brachycrus laticeps
Mammalia - Antilocapridae
Cosoryx (Paracosoryx) wilsoni Frick 1937
Merycodus cf. sabulonis (Matthew and Cook 1909)
recombined as Cosoryx (Paracosoryx) sabulonis
Mammalia - Palaeomerycidae
cf. Barbouromeryx sp. Frick 1937
Bouromeryx sp. Skinner et al. 1977
Mammalia - Camelidae
Camelidae indet. Gray 1821
Blickomylus galushai Frick and Taylor 1968
(1 measurement)
Mammalia - Perissodactyla - Equidae
Hypohippus sp. (Leidy 1858)
original and current combination Anchitherium (Hypohippus)
Merychippus sp. Leidy 1856
    = Equinae indet. Steinmann and Döderlein 1890
Alroy 2002
Mammalia - Perissodactyla - Rhinocerotidae
Rhinocerotidae indet. Gray 1821
Mammalia - Perissodactyla - Chalicotheriidae
Tylocephalonyx skinneri Coombs 1979
see common names

Geography
Country:United States State/province:Wyoming County:Fremont
Coordinates: 43.2° North, 108.2° West (view map)
Paleocoordinates:44.0° North, 104.6° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Time
Period:Neogene Epoch:Miocene
Stage:Burdigalian 10 m.y. bin:Cenozoic 5
*Period:Late/Upper Tertiary *Local age/stage:Hemingfordian
Key time interval:Hemingfordian
Age range of interval:18.50000 - 16.30000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Arikaree
Lithology and environment
Primary lithology: not reported
Environment:eolian indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Museum repositories:UCMP
Taxonomic list comments:F:AM 7 mi W of Muddy Gap locality
"ash deposit within the Split Rock level" dated at 17.1 (= 17.45) Ma (KA; no error stated): Munthe and Coombs 1979
Metadata
Also known as:Third Bench
Database number:19073
Authorizer:J. Alroy, P. Holroyd Enterer:J. Alroy, P. Holroyd
Modifier:P. Holroyd Research group:vertebrate
Created:1993-09-27 00:00:00 Last modified:2024-04-06 17:21:12
Access level:the public Released:1993-09-27 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
2634.5% 16780J. Munthe. 1988. Miocene mammals of the Split Rock area, Granite Mountains basin, central Wyoming. University of California Publications in Geological Sciences 126:1-136 [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]
64367 J. Munthe. 1979. Summary of Miocene vertebrate fossils of the Granite Mountains Basin, central Wyoming. Contributions to Geology, University of Wyoming 18(1):33-46 [P. Holroyd/P. Holroyd]
65390 S. Scarpetta. 2018. The earliest known occurrence of Elgaria (Squamata: Anguidae) and a minimum age for crown Gerrhonotinae: Fossils from the Split Rock Formation, Wyoming, USA. Palaeontologia Electronica 21.1.1FC:1-8 [P. Holroyd/P. Holroyd]
76463 S. G. Scarpetta. 2021. Iguanian lizards from the Split Rock Formation, Wyoming: exploring the modernization of the North American lizard fauna. Journal of Systematic Palaeontology 1-31 [P. Holroyd/P. Holroyd]
3342 J. F. Sutton and W. W. Korth. 1995. Rodents (Mammalia) from the Barstovian (Miocene) Anceney local fauna, Montana. Annals of Carnegie Museum 64(4):267-314 [J. Alroy/J. Alroy/M. Uhen]