Stage Hill II ( of the United States)

Also known as UNSM Sf-105

Where: Scotts Bluff County, Nebraska (41.7° N, 103.7° W: paleocoordinates 42.6° N, 98.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Wildcat Hills Beds Formation (Arikaree Group), Harrisonian (24.8 - 20.4 Ma)

• "late late Arikareean" (= Harrisonian)

•"upper Arikaree Group"

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial; conglomerate and bioturbated, fine-grained sandstone

• "high energy fluvial environment"
• "A one-meter thick lateral accretion gravel was the principal source of vertebrate remains; however, several well preserved mammal jaws were recovered from an overlying bioturbated fine-grained sandstone"

Size classes: macrofossils, mesofossils

Reposited in the UNSM

Collection methods: bulk, sieve,

• rock censused is "gravel concentrate," not the original sediment

Primary reference: B. E. Bailey. 2004. Biostratigraphy and biochronology of early Arikareean through late Hemingfordian small mammal faunas from the Nebraska Panhandle and adjacent areas. Paludicola 4(3):81-113 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 17843: authorized by John Alroy, entered by John Alroy on 13.10.1999, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• "fish, rare with low diversity; reptiles, frequent with moderate diversity; birds, rare; and mammals, common with high diversity. No identifiable amphibian remains..."

•fauna briefly mentioned by Bailey 1999; all details are from Bailey 2004

Mammalia
 Rodentia - Cricetidae
Leidymys sp. Wood 1936 mouse
Paciculus sp. Cope 1879 mouse
 Rodentia - Sciuridae
Protospermophilus sp. Gazin 1930 squirrel
Miospermophilus sp. Black 1963 squirrel
 Rodentia - Geomyidae
Gregorymys formosus Matthew 1907 pocket gopher
Entoptychus grandiplanus Korth 1992 pocket gopher
 Rodentia - Florentiamyidae
cf. Florentiamys sp. Wood 1936 rodent
 Rodentia - Heteromyidae
Cupidinimus sp. Wood 1935 rodent
Harrymys sp.1 Munthe 1988 rodent
said to be new by Bailey 2004
Dikkomys matthewi Wood 1936 rodent
 Rodentia - Castoridae
Palaeocastor sp. Leidy 1869 beaver
 Rodentia - Allomyidae
Alwoodia sp. Rensberger 1983 rodent
 Rodentia - Mylagaulidae
Promylagaulus riggsi McGrew 1941 rodent
 Rodentia - Zapodidae
Schaubeumys sp. Wood 1935 jumping mouse
 Lagomorpha - Leporidae
Archaeolagus sp. Dice 1917 rabbit
 Lagomorpha - Ochotonidae
Gripholagomys lavocati Green 1972 pika
 Lipotyphla - Erinaceidae
Parvericius sp. Koerner 1940 hedgehog
 Lipotyphla - Talpidae
Mystipterus sp. Hall 1930 mole
 Perissodactyla - Tapiridae
Miotapirus harrisonensis Schlaikjer 1937 tapir
 Tribosphenida - Soricidae
Limnoecus sp. Stirton 1930 shrew
 Tribosphenida - Proscalopidae
Proscalops secundus Matthew 1909 placental
 Theriiformes - Herpetotheriidae
Herpetotherium youngi McGrew 1937 marsupial
 Artiodactyla - Merycoidodontidae
Merychyus cf. siouxensis Loomis 1924 oreodont
 Artiodactyla -
Arretotherium acridens Douglass 1902 even-toed ungulate
 Artiodactyla - Protoceratidae
Syndyoceras cooki Barbour 1905 protoceratid
 Artiodactyla - Palaeomerycidae
Barbouromeryx sp. Frick 1937 ruminant
said to be new
 Artiodactyla - Moschidae
Pseudoblastomeryx advena2 Matthew 1907 musk deer