Lay Ranch Beds: Harrisonian, Wyoming

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Perissodactyla - Equidae
Equidae indet. Gray 1821
Mammalia - Perissodactyla - Rhinocerotidae
Menoceras sp. Troxell 1921
Diceratherium sp. Marsh 1875
Mammalia - Perissodactyla - Chalicotheriidae
Moropus sp. Marsh 1877
Skolnick 1985
"chalicothere"
Mammalia - Entelodontidae
Dinohyus sp. Peterson 1905
Skolnick 1985
"entelodont"
Mammalia - Camelidae
Stenomylus gracilis Peterson 1907
Frick and Taylor 1968
"Marsland" equivalent at "Spoon Buttes"; "Camelidae indet."
Mammalia - Merycoidodontidae
Merychyus sp. Leidy 1858
Skolnick 1985
"oreodont"
Mammalia - Carnivora - Mustelidae
Mustelidae indet. Fischer 1817
Mammalia - Carnivora - Amphicyonidae
Adilophontes brachykolos Hunt 2002
Hunt 2002
"southwest of Spoon Butte" in rocks of "latest Arikareean" age
Daphoenodon falkenbachi Hunt 2002
Hunt 2002
"west of Spoon Butte" in rocks of "latest Arikareean" age (3 measurements)
Amphicyonidae indet. Haeckel 1886
    = Ysengrinia sp. Ginsburg 1965
Hunt 1998
    = Ysengrinia americana Wortman 1901
Hunt 2002
both "West of Spoon Butte" and "East of Spoon Butte"
Mammalia - Carnivora - Canidae
Desmocyon thomsoni (Matthew 1907)
Wang et al. 1999
"Upper Harrison beds... Spoon Buttes" and "southwest of Spoon Buttes"; "Canidae indet."
Mammalia - Rodentia
Rodentia indet. Bowdich 1821
see common names

Geography
Country:United States State/province:Wyoming County:Goshen
Coordinates: 42.0° North, 104.2° West (view map)
Paleocoordinates:42.9° North, 99.2° West
Basis of coordinate:based on political unit
Time
10 m.y. bin:Cenozoic 4-5
*Period:Tertiary *Epoch:Miocene
*Local age/stage:Late/Upper Arikareean
Key time interval:Harrisonian
Age range of interval:23.10000 - 18.50000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Stratigraphic resolution:member
Stratigraphy comments: said to be late Arikareean
rocks are roughly Upper Harrison equivalent and significantly older than those of the Spoon Butte Beds (see)
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Taxonomic list comments:some material is probably from Sioux County, Nebraska
Hunt seems to think the locality is new, but F:AM records indicate the he is mistaken
possibly relevant: Archaeohippus sp. Dingus 1990: F:AM specimen from ? Marsland Fm. "near Spoon Buttes"; this could be from the Spoon Butte Beds "Merychyus siouxensis" Loomis 1924: type, from "Lower harrison beds, ten miles west of Agate"; this is close to but perhaps 4 mi E of Spoon Buttes
Metadata
Database number:17796
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:B. Allen Research group:vertebrate
Created:1995-03-26 00:00:00 Last modified:2023-07-29 05:44:07
Access level:the public Released:1995-03-26 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
6228. R. M. Hunt, Jr. 1985. Geology and paleontology of the Patrick Buttes, Wyoming-Nebraska. National Geographic Society Research Reports 20:399-416 [J. Alroy/J. Alroy/J. Alroy]

Secondary references:

1549 C. Frick and B. E. Taylor. 1968. A Generic Review of the Stenomyline Camels. American Museum Novitates 2353:1-51 [J. Alroy/J. Alroy/B. Beatty]
1977 R. M. Hunt, Jr. 1998. Amphicyonidae. 196-227 [J. Alroy/J. Alroy/J. Alroy]
7676 R. M. Hunt, Jr. 2002. New amphicyonid carnivorans (Mammalia, Daphoeninae) from the early Miocene of southeastern Wyoming. American Museum Novitates 3385:1-41 [J. Alroy/J. Alroy/J. Alroy]
3178 R. Skolnick. 1985. The geology and paleontology of the Lay Ranch beds. Proceedings of the Nebraska Academy of Sciences 95:54 [J. Alroy/J. Alroy/M. Uhen]
3558 X. Wang, R. H. Tedford, and B. E. Taylor. 1999. Phylogenetic systematics of the Borophaginae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 243:1-392 [J. Alroy/J. Alroy/J. Alroy]