PBDB Collection

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, edited by Patricia Holroyd

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

Show authors, comments, and common names

unclassified
-	"Cricetid" indet. "Cricetid" indet.
Reptilia
Squamata -	Peltosaurus granulosus² Peltosaurus granulosus² Cope 1873 squamates
Mammalia
Carnivora - Mustelidae	Mustelavus sp.⁶ Mustelavus sp.⁶ Clark 1936 mustelid carnivore
Theriamorpha - Proscalopidae	Proscalops secundus Proscalops secundus Matthew 1909 placental
Theriamorpha - Erinaceidae	Amphechinus horncloudi⁸, Parvericius sp.⁵ Amphechinus horncloudi⁸ Macdonald 1970 hedgehog Parvericius sp.⁵ Koerner 1940 hedgehog
Lagomorpha - Ochotonidae	? Ochotonidae indet., Gripholagomys sp.³ ? Ochotonidae indet. Thomas 1897 pika Gripholagomys sp.³ Green 1972 pika
Rodentia - Florentiamyidae	Florentiamys tiptoni¹ Florentiamys tiptoni¹ Macdonald 1970 rodent
Rodentia - Zapodidae	Schaubeumys grangeri⁴ Schaubeumys grangeri⁴ Wood 1935 jumping mouse
Rodentia - Cricetidae	Leidymys sp.⁷, Paciculus cf. montanus Leidymys sp.⁷ Wood 1936 mouse Paciculus cf. montanus Black 1961 mouse
Rodentia - Allomyidae	Alwoodia harkseni¹ Alwoodia harkseni¹ Macdonald 1963 rodent
Rodentia - Entoptychidae	Gregorymys formosus Gregorymys formosus Matthew 1907 rodent listed also by Wahlert and Souza 1988; NISP "approximately 75"
Rodentia - Sciuridae	Protospermophilus sp.⁹ Protospermophilus sp.⁹ Gazin 1930 squirrel large form only; "Protosciurus" of Macdonald 1970
Rodentia - Castoridae	Castoridae indet.¹, Fossorcastor cf. fossor¹ Castoridae indet.¹ Gray 1821 beaver Fossorcastor cf. fossor¹ Peterson 1905 beaver
Rodentia - Heteromyidae	Proheteromys ironcloudi n. sp.⁶ Proheteromys ironcloudi n. sp.⁶ Macdonald 1963 rodent Macdonald 1972 reports "Proheteromys sp."
Theriamorpha - Herpetotheriidae	Herpetotherium youngi¹ Herpetotherium youngi¹ McGrew 1937 marsupial

¹Alroy 2002; ²ElShafie 2024; ³Green 1972; ⁴Green 1977; ⁵Korth 1992; ⁶Macdonald 1970; ⁷Martin and Green 1984; ⁸Rich 1981; ⁹Storer 2002