Silberling Quarry (Paleocene of the United States)

Also known as Simpson's Locality 1; Fish Creek; Bear Butte; Widdecombe Creek; Widdecombe Ranch

Where: Sweetgrass County, Montana (45.8° N, 109.8° W: paleocoordinates 52.4° N, 86.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: "Upper Lebo" Beds Member ("Fort Union" (= Lebo) Formation), Torrejonian (63.3 - 61.7 Ma)

• in a stratigraphically isolated reversed polarity zone interpreted as chron C27r: Butler et al. 1987

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Collected by Silberling

Primary reference: G. G. Simpson. 1937. The Fort Union of the Crazy Mountain field, Montana and its mammalian faunas. Bulletin of the United States National Museum 169:1-287 [J. Alroy/J. Alroy/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 14913: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Patricia Holroyd and Terri Cleary

Creative Commons license: CC BY (attribution)

Taxonomic list

• first described by Douglass 1908
Reptilia
 Testudines - Pantrionychidae
cf. Plastomenus sp.2 Cope 1873 turtle
 Testudines - Panemydidae
Emydidae indet.3 Rafinesque 1815 turtle
"undescribed emydid"
 Squamata -
Peltosaurus sp.7 Cope 1872 lizard
USNM 10446, 10444, 10811, three fragmentary dentaries described by Gilmore (1928); USNM 10920, incomplete left maxilla with a few teeth, described by Gilmore (1938)
 Squamata - Anguidae
Proxestops silberlingii n. sp.7 Gilmore 1938 lizard
Gilmore 1938: ?Harpagosaurus silberlingii, USNM 13877 (holotype), greater portion of left maxilla with whole or parts of 12 teeth
Mammalia
 Cimolesta - Cimolestidae
Gelastops parcus Simpson 1935 eutherian
 Cimolesta - Pantolestidae
Bessoecetor septentrionalis6 Russell 1929 eutherian
 Cimolesta - Pentacodontidae
Aphronorus fraudator Simpson 1935 eutherian
Coriphagus montanus n. sp. Douglass 1908 eutherian
see Douglass 1908
 Primates -
Palaechthon alticuspis Gidley 1923 primate
 Primates - Picrodontidae
Picrodus silberlingi n. sp. Douglass 1908 primate
see Douglass 1908; includes Douglass' type of "Megopterna minuta"
 Primates - Paromomyidae
Paromomys maturus Gidley 1923 primate
 Dermoptera -
Elpidophorus minor n. sp. Simpson 1937 colugo
 Condylarthra - Hyopsodontidae
Promioclaenus acolytus1 Cope 1882 condylarth
 Condylarthra - Chriacidae
Prothryptacodon furens Simpson 1935 placental
 Tribosphenida - Phenacodontidae
Tetraclaenodon puercensis1 Cope 1881 condylarth
 Ferae - Viverravidae
Bryanictis microlestes1 Simpson 1935 placental
Protictis ? haydenianus1 Cope 1882 placental
 Taeniodonta - Conoryctidae
cf. Huerfanodon sp.5 Schoch and Lucas 1981 taeniodont
 Taeniodonta - Stylinodontidae
Psittacotherium multifragum Cope 1882 taeniodont
 Tribosphenida - Arctocyonidae
Arctocyon ferox4, "Mimotricentes subtrigonus" = Tricentes subtrigonus1, Chriacus punitor1
Arctocyon ferox4 Cope 1883 condylarth
"Mimotricentes subtrigonus" = Tricentes subtrigonus1 Cope 1881 condylarth
Chriacus punitor1 Simpson 1935 condylarth
 Acreodi - Mesonychidae
Dissacus sp. Cope 1881 condylarth
 Sarcobora - Mixodectidae
Eudaemonema cuspidata Simpson 1935 insectivoran
 Multituberculata - Eucosmodontidae
Stygimys jepseni1 Simpson 1935 multituberculate
 Multituberculata - Neoplagiaulacidae
Parectypodus sinclairi1 Simpson 1935 multituberculate
 Multituberculata - Ptilodontidae
Baiotomeus douglassi1 Simpson 1935 multituberculate
Ptilodus montanus n. sp. Douglass 1908 multituberculate
see Douglass 1908
 Multituberculata - Cimolodontidae
Anconodon cochranensis1 Russell 1929 multituberculate