Martin Canyon Quarry A (Miocene of the United States)

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"

• "channel fill" (Chantell 1965)

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

• based on discussion of Tedford et al. 1987, this is above the Martin Canyon Beds sensu stricto, which includes the Merycochoerus Quarry (see), and is equivalent to "horizon D" of Matthew
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
  -
Osteichthyes
 Salientia - Hylidae
Acris sp.3 Dumeril and Bibron 1841 cricket frog
University of Notre Dame specimen in the UNSM collection
 Caudata - Urodela
Andrias matthewi10 Cook 1917 giant salamander
Aves
 Galliformes - Cracidae
Cracidae indet.9 Vigors 1825 fowl
 Cuculiformes - Cuculidae
Cursoricoccyx geraldinae n. gen. n. sp.9
Cursoricoccyx geraldinae n. gen. n. sp.9 Martin and Mengel 1984 cuckoo
Reptilia
 Squamata - Anguidae
Ophisaurus sp.4 Daudin 1803 glass lizard
 Squamata - Boidae
Charina prebottae4 Brattstrom 1958 boa
 Squamata - Colubridae
Texasophis fossilis4 Holman 1977 colubrid snake
Mammalia
 Rodentia - Sciuridae
"Tamiini indet." = Marmotini1 squirrel
Protospermophilus sp.2 Gazin 1930 squirrel
"Sciurus sp. A"; Martin and Mengel 1984 list "Sciurus? sp." DUPLICATE REF 1081 or 1082
Miospermophilus bryanti1 Wilson 1960 squirrel
 Rodentia - Eomyidae
Pseudotheridomys hesperus Wilson 1960 rodent
 Rodentia - Geomyidae
Pleurolicus sp.1 Cope 1878 pocket gopher
 Rodentia - Heteromyidae
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
Stratimus strobeli6 Korth et al. 1990 rodent
may include "Mookomys cf. formicorum" in part
 Rodentia - Castoridae
Hystricops sp.1 Leidy 1858 beaver
Euroxenomys sp.1 Samson and Radulesco 1973 beaver
Priusaulax wilsoni n. sp.5 Korth 2017 beaver
see Korth, 2017
 Rodentia - Mylagaulidae
Mesogaulus paniensis Matthew 1902 rodent
described by Galbreath 1953
 Rodentia - Zapodidae
"Plesiosminthus clivosus" = Schaubeumys clivosus, Schaubeumys galbreathi1
"Plesiosminthus clivosus" = Schaubeumys clivosus Galbreath 1953 jumping mouse
Schaubeumys galbreathi1 Wilson 1960 jumping mouse
 Lagomorpha - Leporidae
 Lagomorpha - Ochotonidae
Oreolagus wilsoni n. sp.1 Dawson 1965 pika
 Lipotyphla - Erinaceidae
Erinaceidae indet.1 Fischer von Waldheim 1817 hedgehog
 Lipotyphla - Talpidae
Mystipterus martini1 Wilson 1960 mole
Scalopoides isodens Wilson 1960 mole
 Perissodactyla - Rhinocerotidae
Menoceras barbouri11, "Brachypotherium americanum n. sp." = Teleoceras americanum13, Peraceras profectum1
Menoceras barbouri11 Wood 1964 rhinoceros
"Brachypotherium americanum n. sp." = Teleoceras americanum13 Yatkola and Tanner 1979 rhinoceros
(type + specimen of Galbreath 1953)
Peraceras profectum1 Matthew 1899 rhinoceros
 Perissodactyla - Equidae
Parahippus pawniensis n. sp. Gidley 1907 anchitheriine horse
is from "horizon D" (5 + 1 "?Merychippus")
Anchitherium sp.7 von Meyer 1844 anchitheriine horse
 Tribosphenida - Plesiosoricidae
? Plesiosorex sp. Pomel 1848 placental
Plesiosorex coloradensis n. sp. Wilson 1960 placental
listed as "P. sp." by Martin and Mengel 1984
 Tribosphenida - Soricidae
Pseudotrimylus roperi1 Wilson 1960 shrew
Wilsonosorex conulatus8 Martin 1978 shrew
"Heterosorex? sp." of Martin
"Antesorex compressus" = Limnoecus compressus1 Wilson 1960 shrew
Angustidens vireti1 Wilson 1960 shrew
 Tribosphenida - Proscalopidae
? 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
 Carnivora - Amphicyonidae
Amphicyoninae indet. Trouessart 1885 bear-dog
 Carnivora - Canidae
Protomarctus optatus1 Matthew 1924 bone-crushing dog
Cynarctoides acridens9 Barbour and Cook 1914 bone-crushing dog
confirmed by Wang et al. 1999
 Ungulata - Merycoidodontidae
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
Merycochoerus sp.1 Leidy 1858 oreodont
 Ungulata - Tayassuidae
Hesperhys sp. Douglass 1903 peccary
(2 + partial skull of Wilson)
 Ungulata - Camelidae
Camelidae indet.1 Gray 1821 camel
 Ungulata - Palaeomerycidae
Barbouromeryx sp. Frick 1937 ruminant
presumably includes "Blastomeryx cf. elegans" and "B. cf. medius" of Galbreath 1953; (5 + 1)
 Didelphimorphia - Didelphidae