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 and Jonathan Marcot

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
Amphibia
 Proteida - Batrachosauroididae
Opisthotriton gidleyi n. sp.7 Sullivan 1991 salamander
AMNH 2667 (holotype), incomplete skull
Opisthotriton kayi7 Auffenberg 1961 salamander
 Caudata - Urodela
Habrosaurus dilatus7 Gilmore 1928 siren
cf. Scapherpeton tectum7 Cope 1876 salamander
Mammalia
 Multituberculata - Cimolodontidae
Anconodon cochranensis Russell 1929 multituberculate
includes type of "A. russelli" - see Simpson 1935d
Anconodon gidleyi 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.6 Sloan 1987 multituberculate
Ectypodus szalayi n. sp.5 Sloan 1981 multituberculate
Neoplagiaulax grangeri n. sp. Simpson 1935 multituberculate
Mesodma pygmaea n. sp.6 Sloan 1987 multituberculate
Mimetodon silberlingi n. sp. Simpson 1935 multituberculate
 Multituberculata - Ptilodontidae
Baiotomeus douglassi1 Simpson 1935 multituberculate
Ptilodus montanus Douglass 1908 multituberculate
 Multituberculata - Eucosmodontidae
Stygimys jepseni n. sp. Simpson 1935 multituberculate
 Theriamorpha - Conoryctidae
 Theriamorpha - Leptictidae
Prodiacodon concordiarcensis n. sp. Simpson 1935 eutherian
Prodiacodon furor n. sp. Novacek 1977 eutherian
described by Novacek 1977
Myrmecoboides montanensis n. sp. Gidley 1915 eutherian
 Theriamorpha - Mixodectidae
Eudaemonema cuspidata n. sp. Simpson 1935 placental
 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
 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 - Carpolestidae
Elphidotarsius florencae n. sp. Gidley 1923 primate
 Primates - Picrodontidae
Picrodus silberlingi Douglass 1908 primate
 Theriamorpha - Geolabididae
Stilpnodon simplicidens n. sp. Simpson 1935 placental
 Theriamorpha - Nyctitheriidae
Leptacodon munusculum n. sp. Simpson 1935 placental
 Theriamorpha - Periptychidae
Anisonchus sectorius Cope 1881 condylarth
 Theriamorpha - Phenacodontidae
Tetraclaenodon puercensis Cope 1881 condylarth
includes "T. septentrionalis" Thewissen 1990, which included some specimens of T. puercensis
 Procreodi - Arctocyonidae
"Arctocyon corrugatus" = Arctocyon corrugatus2, "Arctocyon montanensis" = Arctocyon corrugatus1, Chriacus baldwini1, Chriacus punitor1, "Mimotricentes subtrigonus" = Tricentes subtrigonus1
"Arctocyon corrugatus" = Arctocyon corrugatus2 Cope 1883 condylarth
"Arctocyon montanensis" = Arctocyon corrugatus1 Cope 1883 condylarth
also includes his types of "Neoclaenodon silberlingi" and "N. latidens"
Chriacus baldwini1 Cope 1882 condylarth
Chriacus punitor1 Simpson 1935 condylarth
"Mimotricentes subtrigonus" = Tricentes subtrigonus1 Cope 1881 condylarth
 Theriamorpha - Viverravidae
Intyrictis vanvaleni3 MacIntyre 1966 placental
Protictis haydenianus Cope 1882 placental
Bryanictis microlestes1 Simpson 1935 placental
Simpsonictis tenuis1 Simpson 1935 placental
 Carnivora -
Ictidopappus mustelinus n. sp. Simpson 1935 carnivoran
 Acreodi - Mesonychidae
Dissacus sp. Cope 1881 condylarth
 Condylarthra - Chriacidae
Prothryptacodon furens n. sp. Simpson 1935 placental
 Condylarthra - Hyopsodontidae
Litaletes disjunctus n. sp. Simpson 1935 condylarth
Promioclaenus acolytus1 Cope 1882 condylarth
 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
 Cimolesta - Apatemyidae
Jepsenella praepropera n. gen. n. sp.
Jepsenella praepropera n. gen. n. sp. Simpson 1940 eutherian
 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
Bessoecetor septentrionalis4 Russell 1929 eutherian
Leptonysson basiliscus n. gen. n. sp.8 Van Valen 1967 eutherian
AMNH 35295 - holotype (left mandible)
 Cimolesta - Pentacodontidae
Coriphagus montanus Douglass 1908 eutherian
cf. Aphronorus sp. Simpson 1935 eutherian
said to be new
Aphronorus fraudator n. sp. Simpson 1935 eutherian
 Cimolesta - Pantolambdidae
Pantolambda intermedium n. sp. Simpson 1935 pantodont
includes type of "Titanoides simpsoni" of Simons 1960
Reptilia
 Squamata - Xantusiidae
Palaeoxantusia fera7 Hecht 1956 night lizard
 Squamata -
Varanoidea indet.7 Gray 1827 squamates
 Squamata - Anguidae
Machaerosaurus torrejonensis7 Gilmore 1928 squamates
Proxestops silberlingii7 Gilmore 1938 squamates