Gidley Quarry (Paleocene of the United States)

Where: Sweetgrass County, Montana (45.8° N, 109.8° W: paleocoordinates 52.5° N, 86.9° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Fort Union Formation, Torrejonian (63.3 - 61.7 Ma)

• said by Buckley 1993 to be in the same (unidentified) reversed polarity chron as Silberling Quarry, i.e., possibly C27r

Environment/lithology: terrestrial

Primary reference: K. D. Rose. 1981. The Clarkforkian Land-Mammal Age and Mammalian Faunal Composition Across the Paleocene-Eocene Boundary. University of Michigan Papers on Paleontology 26:1-197 [J. Alroy/J. Alroy/P. Mannion]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 14906: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Chris Bell

Creative Commons license: CC BY (attribution)

Taxonomic list

• many of the types were described by Simpson 1935d
Simpson 1935d lists the type of "Chriacus pusillus" from "Gidley or Silberling Quarries" - no other specimens are listed but the type's catalogue number is close to that of other types from Gidley Quarry; however, this record is omitted by Simpson 1937a and later authors
Osteichthyes
 Proteida - Batrachosauroididae
Opisthotriton gidleyi n. sp.6 Sullivan 1991 tetrapod
AMNH 2667 (holotype), incomplete skull
Opisthotriton kayi6 Auffenberg 1961 tetrapod
 Caudata - Urodela
Habrosaurus dilatus6 Gilmore 1928 siren
cf. Scapherpeton tectum6 Cope 1876 salamander
Reptilia
 Squamata -
Varanoidea indet.6 Gray 1827 lizard
 Squamata - Anguidae
Proxestops silberlingii6 Gilmore 1938 lizard
Machaerosaurus torrejonensis6 Gilmore 1928 lizard
 Squamata - Xantusiidae
Palaeoxantusia fera6 Hecht 1956 night lizard
Mammalia
 Cimolesta - Cimolestidae
Gelastops parcus n. sp. Simpson 1935 eutherian
is "probably from same level" according to Simpson 1935d "probably from Silberling Quarry" according to Simpson 1937a; record definitely includes type of "Emperodon acmeodontoides" Simpson 1935d
Avunculus didelphodonti n. sp. Van Valen 1966 eutherian
see Van Valen 1966
 Cimolesta - Pantolestidae
Leptonysson basiliscus n. gen. n. sp.7 Van Valen 1967 eutherian
AMNH 35295 - holotype (left mandible)
Bessoecetor septentrionalis3 Russell 1929 eutherian
 Cimolesta - Pentacodontidae
cf. Aphronorus sp. Simpson 1935 eutherian
said to be new
Aphronorus fraudator n. sp. Simpson 1935 eutherian
Coriphagus montanus Douglass 1908 eutherian
 Leptictida - Leptictidae
Myrmecoboides montanensis n. sp. Gidley 1915 eutherian
Prodiacodon concordiarcensis n. sp. Simpson 1935 eutherian
Prodiacodon furor n. sp. Novacek 1977 eutherian
described by Novacek 1977
 Primates -
Palaechthon alticuspis n. gen. n. sp.
Palaechthon alticuspis n. gen. n. sp. Gidley 1923 primate
 Primates - Plesiadapidae
Pronothodectes matthewi n. sp. Gidley 1923 primate
 Primates - Picrodontidae
Picrodus silberlingi Douglass 1908 primate
 Primates - Carpolestidae
Elphidotarsius florencae n. sp. Gidley 1923 primate
 Primates - Paromomyidae
Paromomys maturus n. sp. Gidley 1923 primate
Paromomys depressidens n. sp. Gidley 1923 primate
 Primates - Palaechthonidae
Palenochtha minor n. gen. n. sp.
Palenochtha minor n. gen. n. sp. Gidley 1923 primate
 Condylarthra - Hyopsodontidae
Litaletes disjunctus n. sp. Simpson 1935 condylarth
Promioclaenus acolytus1 Cope 1882 condylarth
 Condylarthra - Chriacidae
Prothryptacodon furens n. sp. Simpson 1935 placental
 Tribosphenida - Periptychidae
Anisonchus sectorius Cope 1881 condylarth
 Amblypoda - Pantolambdidae
Pantolambda intermedium n. sp. Simpson 1935 pantodont
includes type of "Titanoides simpsoni" of Simons 1960
 Tribosphenida - Phenacodontidae
Tetraclaenodon puercensis Cope 1881 condylarth
includes "T. septentrionalis" Thewissen 1990, which included some specimens of T. puercensis
 Lipotyphla - Geolabididae
Stilpnodon simplicidens n. sp. Simpson 1935 placental
 Tribosphenida - Nyctitheriidae
Leptacodon munusculum n. sp. Simpson 1935 placental
 Ferae - Viverravidae
Simpsonictis tenuis1 Simpson 1935 placental
Bryanictis microlestes1 Simpson 1935 placental
Protictis haydenianus Cope 1882 placental
Intyrictis vanvaleni2 MacIntyre 1966 placental
 Carnivora -
Ictidopappus mustelinus n. sp. Simpson 1935 carnivoran
 Macroscelidea - Apheliscidae
Haplaletes disceptatrix n. sp. Simpson 1935 elephant shrew
Litomylus dissentaneus n. sp. Simpson 1935 elephant shrew
 Macroscelidea -
Adunator ladae1 Simpson 1935 elephant shrew
includes "Mckennatherium libitum" type of Van Valen 1965
 Taeniodonta - Conoryctidae
 Tribosphenida - Arctocyonidae
"Arctocyon montanensis" = Claenodon montanensis1, Arctocyon ferox2, "Mimotricentes subtrigonus" = Tricentes subtrigonus1, Chriacus baldwini1, Chriacus punitor1
"Arctocyon montanensis" = Claenodon montanensis1 Gidley 1919 condylarth
also includes his types of "Neoclaenodon silberlingi" and "N. latidens"
Arctocyon ferox2 Cope 1883 condylarth
"Mimotricentes subtrigonus" = Tricentes subtrigonus1 Cope 1881 condylarth
Chriacus baldwini1 Cope 1882 condylarth
Chriacus punitor1 Simpson 1935 condylarth
 Acreodi - Mesonychidae
Dissacus sp. Cope 1881 condylarth
 Sarcobora - Mixodectidae
Eudaemonema cuspidata n. sp. Simpson 1935 insectivoran
 Sarcobora - Apatemyidae
Jepsenella praepropera n. gen. n. sp.
Jepsenella praepropera n. gen. n. sp. Simpson 1940 insectivoran
 Multituberculata - Eucosmodontidae
Stygimys jepseni n. sp. Simpson 1935 multituberculate
 Multituberculata - Neoplagiaulacidae
Neoplagiaulacidae indet. Ameghino 1890 multituberculate
two new forms, "1" and "2"
Parectypodus sinclairi n. sp. Simpson 1935 multituberculate
Ectypodus aphronorus n. sp.5 Sloan 1987 multituberculate
Ectypodus szalayi n. sp.4 Sloan 1981 multituberculate
Mesodma pygmaea n. sp.5 Sloan 1987 multituberculate
Mimetodon silberlingi n. sp. Simpson 1935 multituberculate
Neoplagiaulax grangeri n. sp. Simpson 1935 multituberculate
 Multituberculata - Ptilodontidae
Baiotomeus douglassi1 Simpson 1935 multituberculate
Ptilodus montanus Douglass 1908 multituberculate
 Multituberculata - Cimolodontidae
Anconodon cochranensis Russell 1929 multituberculate
includes type of "A. russelli" - see Simpson 1935d
Anconodon gidleyi n. sp. Simpson 1935 multituberculate