Cottonwood Creek (UNSM Dw-118) (Miocene of the United States)

Where: Dawes County, Nebraska (42.5° N, 103.0° W: paleocoordinates 43.2° N, 99.1° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Runningwater Formation, Hemingfordian (20.4 - 16.0 Ma)

• formation given as Marsland, which is equivalent to Runningwater

• member-level stratigraphic resolution

Environment/lithology: terrestrial; poorly lithified, brown sandstone

• "brown, crossbedded, semiconsolidated sands"

Size classes: macrofossils, mesofossils

Reposited in the UNSM

Collection methods: bulk, sieve,

• collected by screenwashing of sediments exposed in road cuts; see Ostrander 1986

Primary reference: L. D. Martin and R. G. Corner. 1980. A new genus of cricetid rodent from the Hemingfordian (Miocene) of Nebraska. University of Kansas Paleontological Contributions Vertebrata 103:1-5 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 17892: authorized by John Alroy, entered by John Alroy on 18.10.1995

Creative Commons license: CC BY (attribution)

Taxonomic list

• possibly relevant: "Merycochoerus proprius" and "M. proprius magnus" Schultz and Falkenbach 1940: "Cottonwood Creek" near Hemingford
Actinopteri
 Teleostei -
Cyprinodontiformes indet. Bertin 1958
"a cypriniform fish"
Osteichthyes
 Salientia -
Anura indet. frog
"several anurans"
Reptilia
 Testudines -
"Chelonia indet." = Testudines
"Chelonia indet." = Testudines Batsch 1788 turtle
"two chelonians"
Aves
  -
Aves indet. Linnaeus 1758 bird
"at least two avians"
Reptilia
 Squamata - Iguanidae
Iguanidae indet. Oppel 1811 squamates
"at least two iguanid lizards"
 Serpentes -
Serpentes indet. snake
"several snakes"
Mammalia
 Rodentia - Cricetidae
Yatkolamys edwardsi n. sp. Martin and Corner 1980 mouse
 Rodentia - Sciuridae
Protospermophilus sp.2 Gazin 1930 squirrel
Miospermophilus sp.2 Black 1963 squirrel
 Rodentia - Geomyidae
Ziamys hugeni2 Korth et al. 1990 pocket gopher
 Rodentia - Heteromyidae
Harrymys magnus2 Wood 1932 rodent
Proheteromys sp.2 Wood 1932 rodent
Schizodontomys amnicolus3 Korth et al. 1990 rodent
"Heteromyidae indet." in part
Stratimus strobeli n. sp.3 Korth et al. 1990 rodent
also at UNSM Dw-117; "Heteromyidae indet." in part
 Rodentia - Mylagaulidae
Mesogaulus paniensis2 Matthew 1902 rodent
 Rodentia - Zapodidae
"Plesiosminthus clivosus" = Schaubeumys clivosus2
"Plesiosminthus clivosus" = Schaubeumys clivosus2 Galbreath 1953 jumping mouse
 Lagomorpha - Leporidae
Archaeolagus sp.2 Dice 1917 rabbit
 Lagomorpha - Ochotonidae
Oreolagus nebrascensis2 McGrew 1941 pika
 Lipotyphla - Erinaceidae
Parvericius montanus4 Koerner 1940 hedgehog
 Lipotyphla - Talpidae
Scalopoides isodens2 Wilson 1960 mole
 Tribosphenida - Soricidae
Pseudotrimylus sp.2 Gureev 1971 shrew
 Tribosphenida - Proscalopidae
Mesoscalops scopelotemos4 Reed 1960 placental
 Ferae -
Carnivora indet. Bowditch 1821 carnivoran
 Ungulata - Merycoidodontidae
Merychyus sp. Leidy 1858 oreodont
 Ungulata - Camelidae
? Oxydactylus sp. Peterson 1904 camel
 Ungulata -
 Ungulata - Palaeomerycidae
Aletomeryx sp. Lull 1920 ruminant