Little Muddy V (UM BB-13) (Eocene of the United States)

Also known as UM BB013; Desertion Point

Where: Lincoln County, Wyoming (41.8° N, 110.7° W: paleocoordinates 45.9° N, 96.9° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Wasatch Formation, Bridgerian (50.3 - 46.2 Ma)

• fossils come from throughout a 30 m section that alternates between the Upper Member of the Wasatch and the Laney Member of the Green River: Zonneveld and Gunnell 2003

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; red, silty mudstone and bioturbated shale

• both floodplain and lacustrine environments are sampled
• "Red to maroon silty mudstone... Paleosol" and "Laminated to bioturbated shale (lacustrine)": Zonneveld and Gunnell 2003

Size class: macrofossils

Primary reference: W. C. Clyde, J.-P. Zonneveld, J. Stamatakos, G. F. Gunnell, and W. S. Bartels. 1997. Magnetostratigraphy across the Wasatchian-Bridgerian boundary (early to middle Eocene) in the western Green River Basin, Wyoming. Journal of Geology 105:657-669 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 16262: authorized by John Alroy, entered by John Alroy on 15.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• NISP unclear because taxa are omitted by Gunnell 1998c
see map of Zonneveld et al. 2000, who repeat the list
Mammalia
 Rodentia - Ischyromyidae
Leptotomus parvus Wood 1959 rodent
omitted by Gunnell 1998c
Paramys cf. copei Loomis 1907 rodent
omitted by Gunnell 1998c
 Rodentia - Sciuravidae
Sciuravus nitidus Marsh 1871 rodent
omitted by Gunnell 1998c
 Primates - Microsyopidae
Microsyops cf. elegans Marsh 1871 primate
 Perissodactyla - Tapiridae
cf. Dilophodon destitutus n. sp.1 Zonneveld and Gunnell 2003 tapir
said to be a new genus
 Perissodactyla - Equidae
Orohippus cf. pumilus Marsh 1871 horse
 Condylarthra - Hyopsodontidae
Hyopsodus minusculus Leidy 1873 condylarth
omitted by Gunnell 1998c
Reptilia
 Testudinata - Baenidae
Baena arenosa2 Leidy 1870 turtle
 Testudines - Geoemydidae
"Echmatemys septaria" = Echmatemys stevensoniana2
"Echmatemys septaria" = Echmatemys stevensoniana2 Leidy 1870 turtle
 Squamata - Iguanidae
Parasauromalus olseni2 Gilmore 1928 squamates
UM 98657, partial right dentary; 98658, partial right dentary
 Squamata - Anguidae
Xestops cf. vagans2 Marsh 1872 squamates
 Crocodylia - Crocodylidae
Crocodylidae indet.2 crocodile
said to be a new genus
 Life -