Monroe Creek (SDSM V-6215) (Oligocene of the United States)

Also known as LACM 2008; Ironcloud Ranch

Where: Shannon County, South Dakota (43.3° N, 102.5° W: paleocoordinates 44.1° N, 96.6° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Monroe Creek Formation, Monroecreekian (26.3 - 24.8 Ma)

Environment/lithology: terrestrial

Reposited in the SDSM

Primary reference: L. J. Macdonald. 1972. Monroe Creek (early Miocene) microfossils from the Wounded Knee area, South Dakota. South Dakota Geological Survey Report of Investigations 105:1-43 [J. Alroy/J. Alroy/M. Uhen]more details

PaleoDB collection 17561: authorized by John Alroy, entered by John Alroy on 26.03.1995

Creative Commons license: CC BY (attribution)

Taxonomic list

• NISP about 175
not clear what "Promylagaulus riggsi" is in light of Rensberger 1979, who does not mention this locality
 Rodentia - Cricetidae
Leidymys sp.6 Wood 1936 mouse
Paciculus cf. montanus Black 1961 mouse
 Rodentia - Sciuridae
Protospermophilus sp.8 Gazin 1930 squirrel
large form only; "Protosciurus" of Macdonald 1970
 Rodentia - Geomyidae
Gregorymys formosus Matthew 1907 pocket gopher
listed also by Wahlert and Souza 1988; NISP "approximately 75"
 Rodentia - Florentiamyidae
Florentiamys tiptoni1 Macdonald 1970 rodent
 Rodentia - Heteromyidae
Proheteromys ironcloudi n. sp.5 Macdonald 1963 rodent
Macdonald 1972 reports "Proheteromys sp."
 Rodentia - Castoridae
Castoridae indet.1 Gray 1821 beaver
Fossorcastor cf. fossor1 Peterson 1905 beaver
 Rodentia - Allomyidae
Alwoodia harkseni1 Macdonald 1963 rodent
 Rodentia - Zapodidae
Schaubeumys grangeri3 Wood 1935 jumping mouse
 Lagomorpha - Ochotonidae
? Ochotonidae indet. Thomas 1897 pika
Gripholagomys sp.2 Green 1972 pika
 Lipotyphla - Erinaceidae
Amphechinus horncloudi7 Macdonald 1970 hedgehog
Parvericius sp.4 Koerner 1940 hedgehog
 Tribosphenida - Proscalopidae
Proscalops secundus Matthew 1909 placental
 Carnivora - Mustelidae
Mustelavus sp.5 Clark 1936 mustelid carnivore
 Theriiformes - Herpetotheriidae
Herpetotherium youngi1 McGrew 1937 marsupial