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