Where: Logan County, Colorado (40.9° N, 103.3° W: paleocoordinates 41.6° N, 99.4° W)
• coordinate stated in text
• small collection-level geographic resolution
When: Pawnee Creek Formation, Hemingfordian (20.4 - 16.0 Ma)
Environment/lithology: "channel"
Size classes: macrofossils, mesofossils
Collected by J. A. Tihen in 1964; reposited in the USNM
• Tihen collection is later than the original ones
Primary reference: R. W. Wilson. 1960. Early Miocene rodents and insectivores from northeastern Colorado. University of Kansas Paleontological Contributions Vertebrata 7:1-92 [J. Alroy/J. Alroy/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 17965: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Clint Boyd
Creative Commons license: CC BY (attribution)
Taxonomic list
Galbreath implies that Merychyus elegans of Schultz and Falkenbach 1947 ("M. paniensis" referred of Loomis 1924) from near "Pawnee Butte" is from the Martin Canyon equivalent shown in his fig. 8
specimen counts for Insectivora and Rodentia based on Wilson, other taxa on Galbreath 1953
generically determinate NISP 333
Galbreath 1953 indicates the presence of a "Merychippus" - grade form and of a chalicothere, both omitted by later authors; Galbreath does indicate that the chalicothere may be from younger sediments; Coombs 1998 describes Moropus material from "Martin Canyon," but this may be from Merycochoerus Quarry
unclassified | |
Aves | |
Cursoricoccyx geraldinae n. gen. n. sp.9
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Reptilia | |
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Mammalia | |
Amphicyoninae indet. Trouessart 1885 bear-dog | |
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Parahippus pawniensis n. sp. Gidley 1907 anchitheriine horse is from "horizon D" (5 + 1 "?Merychippus")
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"Brachypotherium americanum n. sp." = Teleoceras americanum13, "Aphelops profectus n. sp." = Peraceras profectum, Menoceras barbouri11
"Brachypotherium americanum n. sp." = Teleoceras americanum13 Yatkola and Tanner 1979 rhinoceros (type + specimen of Galbreath 1953)
"Aphelops profectus n. sp." = Peraceras profectum Matthew 1899 rhinoceros from "horizon D" and possibly matched by Quarry A specimens, see Galbreath 1953; not clear why this is omitted by Prothero 1989 pers. comm. DUPLICATE REF 3659 or 3703
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Merycochoerus proprius9 Leidy 1858 oreodont "Merycochoerus proprius magnus": list both "M. proprius" and "M. magnus" but the type of the latter is from Merycochoerus Quarry and description of Quarry A specimens of Galbreath 1953 is unclear
Merychyus elegans n. sp.12 Leidy 1858 oreodont of M. "paniensis" Loomis 1924 is said by Thorpe 1937 to be from "Martin Canon" "M. sp." is listed by Wilson but "M. elegans" by Galbreath 1953
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Barbouromeryx sp. Frick 1937 ruminant presumably includes "Blastomeryx cf. elegans" and "B. cf. medius" of Galbreath 1953; (5 + 1)
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? Plesiosorex sp. Pomel 1848 placental | |
"Sorex compressus" = Limnoecus compressus, "Sorex vireti" = Angustidens vireti, "Heterosorex roperi" = Pseudotrimylus roperi, Wilsonosorex conulatus8
"Sorex compressus" = Limnoecus compressus Wilson 1960 shrew
"Sorex vireti" = Angustidens vireti Wilson 1960 shrew
"Heterosorex roperi" = Pseudotrimylus roperi Wilson 1960 shrew | |
"Mydecodon martini" = Mystipterus martini, Scalopoides isodens
"Mydecodon martini" = Mystipterus martini Wilson 1960 mole
Scalopoides isodens Wilson 1960 mole | |
? Proscalops sp. Matthew 1901 placental
Proscalops cf. secundus Matthew 1909 placental listed as "P. sp." by M & M, but i.d. is repeated by Barnosky 1981
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Protospermophilus sp.2 Gazin 1930 squirrel "Sciurus sp. A"; Martin and Mengel 1984 list "Sciurus? sp." DUPLICATE REF 1081 or 1082
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Proheteromys sulculus Wilson 1960 rodent includes "Mookomys cf. formicorum" according to Black 1963a and Gawne 1975; (29 + 5); also may include "? Florentiamys sp." (1 specimen), see Black 1963a, but proper assignment of this species is unclear in any case
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Pseudotheridomys hesperus Wilson 1960 rodent | |
"Plesiosminthus galbreathi" = Schaubeumys galbreathi, "Plesiosminthus clivosus" = Schaubeumys clivosus
"Plesiosminthus galbreathi" = Schaubeumys galbreathi Wilson 1960 jumping mouse
"Plesiosminthus clivosus" = Schaubeumys clivosus Galbreath 1953 jumping mouse | |
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Oreolagus wilsoni n. sp.1
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Amphibia | |
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Acris sp.3 Dumeril and Bibron 1841 cricket frog University of Notre Dame specimen in the UNSM collection
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