SC-133 (Eocene of the United States)

Also known as Bird Quarry Site; Calcirudite Site

Where: Park County, Wyoming (44.8° N, 109.1° W: paleocoordinates 49.6° N, 91.9° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Willwood Formation, Wasatchian (55.8 - 50.3 Ma)

• "zone Wa-2 of Gingerich, 1983"

•the Bird Quarry lens "varies from 10-20 cm in thickness" and the Calcirudite Site is another lens that outcrops "some 10 m higher stratigraphically" and has "a maximum thickness in placs of 30-40 cm"

• group of beds-level stratigraphic resolution

Environment/lithology: wet floodplain; lithified, lenticular, bioturbated wackestone and unlithified, concretionary carbonate

• lines of evidence "suggest [the Bird Site had] a pedogenic origin involving accumulation or precipitation of calcium carbonate in a shallow intermittently flooded depression... Bird Quarry is similar [to the Discovery Site] in some respects, but different in the [tabular or sheet-like] shape of the whole deposit, the rarity of snails, the size and freshness of burrows, and the presence of an extensive network of rootlets... the calcirudite [site] probably involved reworking of soil nodules by a more ephemeral transisent stream"
• all Bird Quarry fossils are from a lens "within a bed of gray mudstone" that "is a complex mass of brecciated, bioturbated micrite with some spar-filled dessication cracks and rare spar-filled gastropods... distinct [silt-filled] burrows and networks of plant rootlets" whereas "the calcirudite bed is composed of rounded calcium carbonate nodules equivalent in grain size to coarse sand" and "grades upward into a thin platy sandstone"

Size classes: macrofossils, mesofossils

Reposited in the UMMP

Primary reference: P. D. Gingerich. 1987. Early Eocene bats (Mammalia, Chiroptera) and other vertebrates in freshwater limestones of the Willlwood Formation, Clark's Fork Basin, Wyoming. Contributions from the Museum of Paleontology, University of Michigan 27(11):275-320 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 15779: authorized by John Alroy, entered by John Alroy on 27.09.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• meter level given by Gunnell and Gingerich 1991
Gastropoda
 Pulmonata - Grangerellidae
Grangerella sp. Cockerell 1915 slug
one specimen
Aves
  -
Aves indet. Linnaeus 1758 bird
"numerous bird bones [UM 86343]"
Reptilia
 Squamata -
Squamata indet. Oppel 1811 squamates
"lizard jaws and vertebrae"
Mammalia
 Primates - Microsyopidae
Arctodontomys wilsoni Szalay 1969 primate
 Primates - Omomyidae
Teilhardina sp.1 Simpson 1940 tarsier
T. crassidens-americana intergrade
 Primates - Notharctidae
Cantius mckennai6 Gingerich and Simons 1977 primate
 Cimolesta - Palaeoryctidae
Eoryctes melanus n. gen. n. sp.11
Eoryctes melanus n. gen. n. sp.11 Thewissen and Gingerich 1989 eutherian
may include the "one or more insectivores" mentioned by Gingerich
 Rodentia - Ischyromyidae
Paramys sp. Leidy 1871 rodent
 Perissodactyla -
Homogalax protapirinus3 Wortman 1896 odd-toed ungulate
Cardiolophus radinskyi3 Gingerich 1991 odd-toed ungulate
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri3
"Hyracotherium grangeri" = Sifrhippus grangeri3 Gingerich 1989 horse
 Creodonta - Oxyaenidae
Oxyaena gulo7 Matthew and Granger 1915 creodont
 Ferae - Viverravidae
Didymictis leptomylus10 Cope 1880 placental
Viverravus rosei10 Polly 1997 placental
Viverravus acutus10 Matthew and Granger 1915 placental
 Macroscelidea - Apheliscidae
Haplomylus speirianus Cope 1880 elephant shrew
Apheliscus chydaeus4 Gingerich 1994 elephant shrew
 Ungulata - Hyopsodontidae
Hyopsodus loomisi McKenna 1960 condylarth
 Ungulata - Diacodexeidae
Diacodexis metsiacus Cope 1882 even-toed ungulate
 Acreodi -
Wyolestes apheles2 Gingerich 1981 mesonychian
DUPLICATE REF 1643 or 1644
 Hyaenodonta -
Prolimnocyon haematus5 Gingerich and Deutsch 1989 eutherian
 Hyaenodonta - Hyaenodontidae
Prototomus martis5 Gingerich and Deutsch 1989 eutherian
Prototomus phobos5 Gingerich and Deutsch 1989 eutherian
Arfia shoshoniensis5 Matthew and Granger 1915 eutherian
 Theriiformes - Peradectidae
Mimoperadectes houdei n. sp.8 Horovitz et al. 2009 metatherian
 Multituberculata - Neoplagiaulacidae
Ectypodus tardus9 Jepsen 1940 multituberculate
Pyramidula
  -
"Discus ralstonensis" = Pyramidula ralstonensis
"Discus ralstonensis" = Pyramidula ralstonensis Cockerell 1914
one specimen