Cedar Ridge: Orellan, Wyoming

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Lagomorpha - Leporidae
Palaeolagus burkei Schlaikjer 1935
(6 measurements)
Palaeolagus cf. intermedius Matthew 1899
see also Korth 1989b
Mammalia - Rodentia - Aplodontidae
Pelycomys placidus Galbreath 1953
(6 measurements)
Prosciurus relictus (Cope 1873)
recombined as Altasciurus relictus
(6 measurements)
Mammalia - Rodentia - Sciuridae
Cedromus wardi Wilson 1949
Korth 1989
Mammalia - Rodentia - Cricetidae
Eumys parvidens Wood 1937
    = Scottimus cf. ambiguus Korth 1981
Korth 1981
see also Korth 1989b
Eumys brachyodus Wood 1937
    = Wilsoneumys planidens Wilson 1949
Korth 1989
and "Eumys cf. planidens"
Eumys elegans Leidy 1856
(6 measurements)
Mammalia - Rodentia - Eomyidae
Metadjidaumo hendryi n. sp. Setoguchi 1978
(6 measurements)
"Namatomys" sp. Black 1965
Korth 1989
this probably really is Namatomys, according to Chiment and Korth 1996
Paradjidaumo hypsodus Setoguchi 1978
(6 measurements)
Adjidaumo sp. Hay 1899
Korth 1989
A. "douglassi"
Mammalia - Rodentia - Heliscomyidae
Heliscomys mcgrewi Korth 1989
Korth 1989
recombined as Megaheliscomys mcgrewi
Heliscomys cf. vetus Cope 1873
see also Korth 1989b (6 measurements)
Heliscomys hatcheri Wood 1935
Korth 1989
Mammalia - Carnivora - Canidae
Hesperocyon temnodon (Wortman and Matthew 1899)
    = Canidae indet. Fischer de Waldheim 1817
Korth 1981
i.d. by Setoguchi is wrong even at the genus level; Wang 1994 suggests this is actually an amphicyonid!
Mammalia - Hypisodontidae
Hypisodus minimus (Cope 1873)
Mammalia - Leptomerycidae
Leptomeryx evansi Leidy 1853
Mammalia - Perissodactyla - Hyracodontidae
Hyracodontidae indet. Cope 1879
Mammalia - Perissodactyla - Equidae
Miohippus sp. Marsh 1874
Mammalia - Proscalopidae
Proscalops miocaenus Matthew 1901
(1 measurement)
? Oligoscalops sp. Reed 1961
Mammalia - Geolabididae
Centetodon cf. marginalis (Cope 1873)
    = Centetodon magnus Clark 1936
Lillegraven et al. 1981
in part
Centetodon cf. marginalis (Cope 1873)
    = Centetodon marginalis Cope 1873
Lillegraven et al. 1981
in part
Mammalia - Micropternodontidae
Micropternodus sp. Matthew 1903
Mammalia - Soricidae
Domnina cf. gradata Cope 1873
(5 measurements)
Mammalia - Macroscelidea - Amphilemuridae
Ankylodon cf. annectens Patterson and McGrew 1937
(1 measurement)
Mammalia - Leptictidae
Leptictis sp. Leidy 1868
    = Leptictidae indet. Gill 1872
Alroy 2002
Mammalia
Peradectes minutus (McGrew 1937)
    = Nanodelphys hunti Cope 1873
Alroy 2002
recombined as Nanodelphys huntii
replaces ID of Krishtalka and Stucky 1983b; "Nanodelphys new sp." in part
Didelphini indet. Crochet 1979
    = Copedelphys stevensoni Cope 1873
Korth 1994
replaces ID of Krishtalka and Stucky 1983, "Nanodelphys new sp." in part DUPLICATE REF 2121 or 2122 or 2123
Peratherium cf. spindleri Macdonald 1963
(6 measurements)
    = Herpetotherium cf. youngi McGrew 1937
Alroy 2002
    = Herpetotherium fugax Cope 1873
Korth 2018
Korth (2018) notes that these specimens are referable to Herpetotherium fugax.
Reptilia - Iguanidae
Leiocephalus sp. Gray 1827
iguanid lizard
Amphibia - Temnospondyli - Batrachosauroididae
? Batrachosauroides sp. Taylor and Hesse 1943
batrachosauroidid salamander
see common names

Geography
Country:United States State/province:Wyoming County:Natrona
Coordinates: 43.3° North, 107.5° West (view map)
Paleocoordinates:44.7° North, 99.4° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Paleogene Epoch:Oligocene
Stage:Rupelian 10 m.y. bin:Cenozoic 4
*Period:Early/Lower Tertiary *Epoch:Early/Lower Oligocene
*Local age/stage:Orellan
Key time interval:Orellan
Age range of interval:33.90000 - 31.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Local section:BadCr Local bed:5
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: from a single siltstone lends within an unnamed Oligocene formation overlying the Hendry Ranch Mbr.
Orellan according to Korth 1981, Lillegraven et al. 1981, Krishtalka and Stucky 1983b, Korth 1994; Whitneyan according to Setoguchi and Emry et al. 1987
Lithology and environment
Primary lithology:tuffaceous,brown siltstone
Secondary lithology:lenticular calcareous siltstone
Lithology description: "calcareously cemented lens of siltstone" within a "soft, tan, tuffaceous siltstone"
Environment:lacustrine - small
Geology comments: calcareous lens represents one of the "small playa lakes on the flood plain" within a "braided stream situation"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Articulated whole bodies:none
Associated major elements:none
Disassociated major elements:some
Disassociated minor elements:many
Collection methods and comments
Collection methods:bulk,sieve,field collection
Collection size:1500 specimens
Reason for describing collection:taxonomic analysis
Collection method comments: "More than fifteen hundred identifiable specimens... two tons of matrix were washed"
Taxonomic list comments:Setoguchi 1978 believed that "Proheteromys cf. nebraskensis" was conspecific with "Heliscomys" (=Kirkomys) schlaikjeri (see Wahlert 1984), but K. schlaikjeri is not present and specimens instead represent H. mcgrewi and H. hatcheri: Korth 1989c
Metadata
Also known as:Badwater Locality 19
Database number:17318
Authorizer:J. Alroy, C. Boyd Enterer:J. Alroy, C. Boyd
Modifier:E. Leckey Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2003-07-14 13:50:18
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
3102.5% 33880T. Setoguchi. 1978. Paleontology and geology of the Badwater Creek area, central Wyoming. Part 16. The Cedar Ridge local fauna (late Oligocene). Bulletin of Carnegie Museum of Natural History 9:1-61 [J. Alroy/J. Alroy/J. Head]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
21025% 31200W. W. Korth. 1981. Metadjidaumo (Eomyidae, Rodentia) from Colorado and Wyoming. Journal of Paleontology 55(3):598-602 [J. Alroy/J. Alroy/J. Alroy]
2103 W. W. Korth. 1981. New Oligocene rodents from western North America. Annals of Carnegie Museum 50(10):289-318 [J. Alroy/J. Alroy/M. Uhen]
2113 W. W. Korth. 1989. Stratigraphic occurrence of rodents and lagomorphs in the Orella Member, Brule Formation (Oligocene), northwestern Nebraska. Contributions to Geology, University of Wyoming 27(1):15-20 [J. Alroy/J. Alroy/J. Marcot]
2121 W. W. Korth. 1994. Middle Tertiary marsupials (Mammalia) from North America. Journal of Paleontology 68(2):376-397 [J. Alroy/J. Alroy/J. Alroy]
73682 W. W. Korth. 2018. Review of the marsupials (Mammalia: Metatheria) from the late Paleogene (Chadronian-Arikareean: late Eocene-late Oligocene) of North America. PalZ [C. Boyd/C. Boyd]
2241 J. A. Lillegraven, M. C. McKenna, and L. Kristalka. 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 Publication 45:1-115 [J. Alroy/J. Alroy/M. Uhen]