Silberling Quarry: Torrejonian, Montana
collected by Silberling

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Peltosaurus sp. Cope 1873
Sullivan 1991 4 specimens
USNM 10446, 10444, 10811, three fragmentary dentaries described by Gilmore (1928); USNM 10920, incomplete left maxilla with a few teeth, described by Gilmore (1938)
Reptilia - Anguidae
Proxestops silberlingii n. sp. (Gilmore 1938)
Sullivan 1991 1 specimen
Gilmore 1938: ?Harpagosaurus silberlingii, USNM 13877 (holotype), greater portion of left maxilla with whole or parts of 12 teeth
Reptilia - Testudines - Emydidae
Emydidae indet. Rafinesque 1815
McKenna et al. 1987
"undescribed emydid"
Reptilia - Testudines
cf. Plastomenus sp. Cope 1873
Hutchison 2009
Mammalia - Multituberculata - Cimolodontidae
Ectypodus russelli Simpson 1935
    = Anconodon cochranensis Russell 1929
Alroy 2002
Mammalia - Multituberculata - Ptilodontidae
? Ptilodus douglassi Simpson 1935
    = Baiotomeus douglassi Simpson 1935
Alroy 2002
Ptilodus montanus n. sp. Douglass 1908
see Douglass 1908
Mammalia - Multituberculata - Neoplagiaulacidae
? Ptilodus sinclairi Simpson 1935
    = Parectypodus sinclairi Simpson 1935
Alroy 2002
Mammalia - Multituberculata - Eucosmodontidae
Eucosmodon sparsus Simpson 1937
    = Stygimys jepseni Simpson 1935
Alroy 2002
Mammalia - Condylarthra - Hyopsodontidae
Ellipsodon aquilonius Simpson 1935
    = Promioclaenus acolytus Cope 1882
Alroy 2002
Mammalia - Phenacodontidae
Tetraclaenodon symbolicus Gidley 1935
    = Tetraclaenodon puercensis Cope 1881
Alroy 2002
Mammalia - Procreodi - Arctocyonidae
Mimotricentes latidens (Gidley 1935)
    = Mimotricentes subtrigonus Cope 1881
Alroy 2002
recombined as Tricentes subtrigonus
and type of "M. angustidens"
Metachriacus punitor Simpson 1935
    = Chriacus punitor Simpson 1935
Alroy 2002
Arctocyon ferox (Cope 1883)
Rigby 1980
Mammalia - Viverravidae
Didymictis haydenianus Cope 1882
    = Protictis ? haydenianus Cope 1882
Alroy 2002
Didymictis microlestes Simpson 1935
    = Bryanictis microlestes Simpson 1935
Alroy 2002
Mammalia - Acreodi - Oxyclaenidae
Prothryptacodon furens Simpson 1935
Coriphagus montanus n. sp. Douglass 1908
see Douglass 1908
Mammalia - Acreodi - Mesonychidae
Dissacus sp. Cope 1881
Mammalia - Pantolestidae
Bessoecetor diluculi (Simpson 1935)
    = Propalaeosinopa diluculi Simpson 1935
Alroy 2002
    = Bessoecetor septentrionalis Russell 1929
Scott et al. 2002
Mammalia - Mixodectidae
Eudaemonema cuspidata Simpson 1935
Mammalia - Dermoptera
Elpidophorus minor n. sp. Simpson 1937
(1 measurement)
Mammalia - Primates - Picrodontidae
Picrodus silberlingi n. sp. Douglass 1908
see Douglass 1908; includes Douglass' type of "Megopterna minuta"
Mammalia - Primates - Paromomyidae
Paromomys maturus Gidley 1923
Mammalia - Primates
Palaechthon alticuspis Gidley 1923
Mammalia - Cimolestidae
Gelastops parcus Simpson 1935
Mammalia - Pentacodontidae
Aphronorus fraudator Simpson 1935
Mammalia
Psittacotherium multifragum Cope 1882
Conoryctes comma Cope 1881
    = cf. Huerfanodon sp. Schoch and Lucas 1981
Schoch 1986
see common names

Geography
Country:United States State/province:Montana County:Sweetgrass
Coordinates: 45.8° North, 109.8° West (view map)
Paleocoordinates:52.4° North, 86.8° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Time
Period:Paleogene Epoch:Paleocene
10 m.y. bin:Cenozoic 1
*Period:Tertiary
Key time interval:Torrejonian
Age range of interval:63.80000 - 60.90000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:"Fort Union" (= Lebo) Member:"Upper Lebo" Beds
Local section:Crazy Local bed:1795 ft
Local order:bottom to top
Stratigraphy comments: in a stratigraphically isolated reversed polarity zone interpreted as chron C27r: Butler et al. 1987
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Collectors:Silberling
Taxonomic list comments:first described by Douglass 1908
Metadata
Also known as:Simpson's Locality 1; Fish Creek; Bear Butte; Widdecombe Creek; Widdecombe Ranch
Database number:14913
Authorizer:J. Alroy, P. Barrett, P. Holroyd Enterer:J. Alroy, T. Cleary, P. Holroyd
Modifier:T. Cleary Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2016-07-20 05:02:44
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
3144. 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]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
14584ETE C. W. Gilmore. 1938. Descriptions of new and little-known fossil lizards from North America. Proceedings of the United States National Museum 86(3042):11-26 [M. Carrano/M. Carrano/M. Carrano]
58298 J. H. Hutchison. 2009. New soft-shelled turtles (Plastomeninae, Trionychidae, Testudines) from the Cretaceous and Paleocene of North America. PaleoBios 29(2):36-47 [P. Holroyd/P. Holroyd]
2540 M. C. McKenna, J. H. Hutchison, and J. H. Hartman. 1987. Paleocene vertebrates and nonmarine Mollusca from the Goler Formation, California. In B. F. Cox (ed.), Basin Analysis and Paleontology of the Paleocene and Eocene Goler Formation, El Paso Mountains, California 31-41 [J. Alroy/J. Alroy/P. Holroyd]
2905 J. K. Rigby, Jr. 1980. Swain Quarry of the Fort Union Formation, Middle Paleocene (Torrejonian), Carbon County, Wyoming: geologic setting and mammalian fauna. Evolutionary Monographs 3:1-178 [J. Alroy/J. Alroy/J. Marcot]
3053 R. M. Schoch. 1986. Systematics, Functional Morphology and Macroevolution of the Extinct Mammalian Order Taeniodonta. Peabody Museum of Natural History Bulletin 42:1-320 [J. Alroy/J. Alroy/M. Uhen]
7598 R. M. Sullivan. 1991. Paleocene Caudata and Squamata from Gidley and Silberling quarries, Montana. Journal of Vertebrate Paleontology 11(3):293-301 [J. Alroy/J. Alroy/J. Alroy]