Lay Ranch Beds ( of the United States)

Where: Goshen County, Wyoming (42.0° N, 104.2° W: paleocoordinates 42.9° N, 98.4° W)

• coordinate based on political unit

When: Arikareean (30.8 - 20.4 Ma)

• said to be late Arikareean

•rocks are roughly Upper Harrison equivalent and significantly older than those of the Spoon Butte Beds (see)

• member-level stratigraphic resolution

Environment/lithology: terrestrial

Primary reference: 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]more details

PaleoDB collection 17796: authorized by John Alroy, entered by John Alroy on 26.03.1995

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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

 Glires -
 Perissodactyla - Chalicotheriidae
Moropus sp.4 Marsh 1877 chalicothere
 Perissodactyla - Rhinocerotidae
Menoceras sp. Troxell 1921 rhinoceros
Diceratherium sp. Marsh 1875 rhinoceros
 Perissodactyla - Equidae
Equidae indet. Gray 1821 horse
 Carnivora - Amphicyonidae
Ysengrinia americana2 Wortman 1901 bear-dog
Daphoenodon falkenbachi3 Hunt 2002 bear-dog
"west of Spoon Butte" in rocks of "latest Arikareean" age
Adilophontes brachykolos3 Hunt 2002 bear-dog
"southwest of Spoon Butte" in rocks of "latest Arikareean" age
 Carnivora - Mustelidae
Mustelidae indet. Fischer 1817 mustelid carnivore
 Carnivora - Canidae
Desmocyon thomsoni5 Matthew 1907 bone-crushing dog
"Upper Harrison beds... Spoon Buttes" and "southwest of Spoon Buttes"; "Canidae indet."
 Ungulata - Merycoidodontidae
Merychyus sp.4 Leidy 1858 oreodont
 Ungulata - Entelodontidae
Dinohyus sp.4 Peterson 1905 even-toed ungulate
 Ungulata - Camelidae
Stenomylus gracilis1 Peterson 1907 camel
"Marsland" equivalent at "Spoon Buttes"; "Camelidae indet."