Y2K Quarry (Paleocene of the United States)

Where: Park County, Wyoming (44.3° N, 109.0° W: paleocoordinates 50.2° N, 88.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Fort Union Formation, Tiffanian (61.7 - 56.8 Ma)

• from "a thin (2-12 cm) siltstone layer" between Princeton Quarry (680 m level) and Holly's Microsite (1280 m level) and in the "upper part of the Plesiadapis simonsi Zone," which ranges from below 680 m to about 960 m (see Rose 1981); placed at "80 m stratigraphically above Princeton Quarry" (i.e., 760 m) by Secord et al. 2002

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; siltstone

• "siltstone"

Size classes: macrofossils, mesofossils

Collection methods: bulk, quarrying, sieve,

• "98 mammalian jaws and jaw fragments, and 265 isolated teeth"

Primary reference: R. Secord. 2002. The Y2K Quarry, a new diverse latest Tiffanian (late Paleocene) mammalian assemblage from the Fort Union Formation in the northern Bighorn Basin, Wyoming. Journal of Vertebrate Paleontology 22(3):105A [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26569: authorized by John Alroy, entered by John Alroy on 17.10.2002, edited by K. Christopher Beard and Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Allotheria -
Multituberculata indet. Cope 1884 multituberculate
 Multituberculata - Microcosmodontidae
Microcosmodon conus3 Jepsen 1930 multituberculate
 Multituberculata - Neoplagiaulacidae
"Parectypodus laytoni" = Ectypodus laytoni3, Ectypodus powelli
"Parectypodus laytoni" = Ectypodus laytoni3 Jepsen 1940 multituberculate
Ectypodus powelli Jepsen 1940 multituberculate
 Multituberculata - Ptilodontidae
Prochetodon cavus3 Jepsen 1940 multituberculate
 Theriamorpha - Leptictidae
Prodiacodon cf. tauricinerei3 Jepsen 1930 eutherian
cf. Palaeictops sp.3 Matthew 1899 eutherian
 Primates - Microsyopidae
Arctodontomys sp.3 Gunnell 1985 primate
Based on UM 110977, RM2/
 Primates - Micromomyidae
"Micromomys millennius n. sp." = Dryomomys millennius3
"Micromomys millennius n. sp." = Dryomomys millennius3 Secord 2008 primate
said to be new
 Primates - Paromomyidae
"Dillerlemur pagei" = Dillerlemur pagei1, "Phenacolemur pagei" = Dillerlemur pagei3
"Dillerlemur pagei" = Dillerlemur pagei1 Jepsen 1930 primate
"Phenacolemur pagei" = Dillerlemur pagei3 Jepsen 1930 primate
 Primates - Plesiadapidae
Plesiadapis cf. dubius3 Matthew 1915 primate
 Primates - Carpolestidae
Carpolestes dubius Jepsen 1930 primate
 Theriamorpha - Erinaceidae
Litolestes ignotus3 Jepsen 1930 hedgehog
 Theriamorpha - Nyctitheriidae
Leptacodon packi3 Jepsen 1930 placental
Leptacodon packi3 Jepsen 1930 placental
Plagioctenodon sp. Bown 1979 placental
 Theriamorpha - Phenacodontidae
Ectocion mediotuber3 Thewissen 1990 condylarth
 Procreodi - Arctocyonidae
Arctocyon cf. nexus3 Gazin 1956 condylarth
Claenodon sp. Scott 1892 condylarth
Princetonia cf. yalensis3 Gingerich 1989 condylarth
 Theriamorpha - Viverravidae
Viverravus schaffi3 Gingerich and Winkler 1985 placental
Based on UM 109185, LM/1; UM 109327, LM/2; UM 109484, RM/1
 Theriamorpha - Metacheiromyidae
Mylanodon rosei n. gen. n. sp.4
Mylanodon rosei n. gen. n. sp.4 Secord et al. 2002 placental
said to be new
 Macroscelidea -
Adunator minutus3 Jepsen 1930 elephant shrew
 Proteutheria - Palaeoryctidae
Palaeoryctes jepseni n. sp.2 Bloch et al. 2004 eutherian
said to be new
 Cimolesta - Apatemyidae
Labidolemur soricoides3 Matthew and Granger 1921 eutherian