Cedar Ridge (Oligocene of the United States)

Also known as Badwater Locality 19

Where: Natrona County, Wyoming (43.3° N, 107.5° W: paleocoordinates 44.7° N, 99.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Orellan (33.9 - 33.3 Ma)

• 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

• bed-level stratigraphic resolution

Environment/lithology: lacustrine - small; tuffaceous, brown siltstone and lenticular, calcareous siltstone

• calcareous lens represents one of the "small playa lakes on the flood plain" within a "braided stream situation"
• "calcareously cemented lens of siltstone" within a "soft, tan, tuffaceous siltstone"

Size classes: macrofossils, mesofossils

Collection methods: bulk, sieve,

• "More than fifteen hundred identifiable specimens... two tons of matrix were washed"

Primary reference: T. 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 17318: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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
Osteichthyes
 Proteida - Batrachosauroididae
? Batrachosauroides sp. Taylor and Hesse 1943 salamander
batrachosauroidid salamander
Reptilia
 Squamata - Iguanidae
Leiocephalus sp. Gray 1827 curly-tailed lizard
iguanid lizard
Mammalia
 Leptictida - Leptictidae
Leptictidae indet.1 Gill 1872 eutherian
 Rodentia - Cricetidae
Scottimus cf. ambiguus3 Korth 1981 mouse
Wilsoneumys planidens4 Wilson 1949 mouse
Eumys elegans Leidy 1856 mouse
 Rodentia - Aplodontidae
"Prosciurus relictus" = Altasciurus relictus
"Prosciurus relictus" = Altasciurus relictus Cope 1873 mountain beaver
 Rodentia - Sciuridae
Cedromus wardi4 Wilson 1949 squirrel
 Rodentia - Eomyidae
"Namatomys" sp.4 Black 1965 rodent
this probably really is Namatomys, according to Chiment and Korth 1996
Paradjidaumo hypsodus Setoguchi 1978 rodent
Metadjidaumo hendryi n. sp. Setoguchi 1978 rodent
Adjidaumo sp.4 Hay 1899 rodent
A. "douglassi"
 Rodentia - Heliscomyidae
"Heliscomys mcgrewi" = Megaheliscomys mcgrewi4 Korth 1989 rodent
Heliscomys cf. vetus Cope 1873 rodent
see also Korth 1989b
Heliscomys hatcheri4 Wood 1935 rodent
 Rodentia - Ischyromyidae
Pelycomys placidus Galbreath 1953 rodent
 Lagomorpha - Leporidae
Palaeolagus cf. intermedius Matthew 1899 rabbit
see also Korth 1989b
Palaeolagus burkei Wood 1940 rabbit
 Lipotyphla - Geolabididae
Centetodon magnus6 Clark 1936 placental
Centetodon marginalis6 Cope 1873 placental
 Perissodactyla - Hyracodontidae
Hyracodontidae indet. Cope 1879 odd-toed ungulate
 Perissodactyla - Equidae
Miohippus sp. Marsh 1874 anchitheriine horse
 Tribosphenida - Heterosoricidae
Domnina cf. gradata Cope 1873 placental
 Tribosphenida - Proscalopidae
? Oligoscalops sp. Reed 1961 placental
Proscalops miocaenus Matthew 1901 placental
 Tribosphenida - Micropternodontidae
Micropternodus sp. Matthew 1903 placental
 Carnivora - Canidae
Canidae indet.2 Fischer 1817 canid
 Macroscelidea - Amphilemuridae
Ankylodon cf. annectens Patterson and McGrew 1937 elephant shrew
 Ungulata - Hypisodontidae
Hypisodus minimus Cope 1873 ruminant
 Ungulata - Leptomerycidae
Leptomeryx evansi Leidy 1853 ruminant
 Theriiformes - Peradectidae
Nanodelphys hunti1 Cope 1873 metatherian
 Theriiformes - Herpetotheriidae
Herpetotherium cf. youngi1 McGrew 1937 marsupial
Copedelphys stevensoni5 Cope 1873 marsupial