PBDB Collection

State Line Quarry (Eocene of the United States)

Also known as Thomas Canyon

Where: Uinta County, Wyoming (41.3° N, 111.0° W: paleocoordinates 45.4° N, 97.6° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Bulldog Hollow Member (Fowkes Formation), Bridgerian (50.3 - 46.2 Ma)

• all fossils are from a single quarry within a member

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; tuffaceous mudstone and sandstone

• "tuffaceous mudstone, sandstone, and siliceous limestone" (Nelson 1973) or "tuffaceous mudstone and sandstone" (Nelson 1974, 1977)

Size classes: macrofossils, mesofossils

Collection methods: quarrying,

Primary reference: M. E. Nelson. 1973. Age and stratigraphic relationships of the Fowkes Formation, Eocene, of southwestern Wyoming and northeastern Utah. Contributions to Geology, University of Wyoming 12(1):27-31 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 16418: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

• close to the Utah state line and well west of the Green River Basin

•date of 47.9 (49.1 corrected) +/- 1.9 Ma (K-Ar on biotite) on a sample immediately above the quarry; date of 47.7 Ma reported earlier is from a site 48 km to the north

Show authors, comments, and common names

Reptilia
Testudines - Kinosternoidea	Xenochelys bridgerensis³ Xenochelys bridgerensis³ Hutchison 1991 mud turtle UCMP loc V74135=State Line Quarry
Testudines - Geoemydidae	Bridgeremys pusilla⁴ Bridgeremys pusilla⁴ Hay 1908 turtle
Mammalia
Insectivora -	Insectivora indet. Insectivora indet. Bowdich 1821 insectivoran three forms
Condylarthra - Hyopsodontidae	Hyopsodus lepidus Hyopsodus lepidus Matthew 1909 condylarth
Primates - Omomyidae	Omomys carteri, Hemiacodon gracilis Omomys carteri Leidy 1869 tarsier Hemiacodon gracilis Marsh 1872 tarsier
Primates - Microsyopidae	Uintasorex parvulus Uintasorex parvulus Matthew 1909 primate
Primates - Notharctidae	Notharctus cf. robustior⁵ Notharctus cf. robustior⁵ Leidy 1872 primate
Rodentia - Muridae	Mysops parvus Mysops parvus Marsh 1872 mouse
Rodentia - Paramyidae	Paramyidae indet. Paramyidae indet. Miller and Gidley 1918 rodent two forms, close to Leptotomus
Rodentia - Ischyromyidae	Microparamys minutus, ? Paramys aff. excavatus, Thisbemys corrugatus, Leptotomus parvus² Microparamys minutus Wilson 1937 rodent ? Paramys aff. excavatus Loomis 1907 rodent Thisbemys corrugatus Wood 1959 rodent Leptotomus parvus² Wood 1959 rodent
Rodentia - Sciuravidae	Sciuravidae indet., Pauromys sp., ? Tillomys sp. Sciuravidae indet. Miller and Gidley 1918 rodent Pauromys sp. Troxell 1923 rodent ? Tillomys sp. Marsh 1872 rodent
Theriamorpha - Nyctitheriidae	"Scenopagus priscus" = Nyctitherium priscum, Nyctitherium serotinum, "Talpavus cf. nitidus" = Nyctitherium nitidum "Scenopagus priscus" = Nyctitherium priscum Marsh 1872 placental Nyctitherium serotinum Marsh 1872 placental "Talpavus cf. nitidus" = Nyctitherium nitidum Marsh 1872 placental
Theriamorpha -	Miacis parvivorus Miacis parvivorus Cope 1872 placental
Carnivora - Miacidae	Miacidae indet. Miacidae indet. Cope 1880 carnivoran
Perissodactyla - Equidae	Orohippus sp. Orohippus sp. Marsh 1872 horse
Perissodactyla - Hyrachyidae	Hyrachyus modestus Hyrachyus modestus Leidy 1870 odd-toed ungulate
Cimolesta - Apatemyidae	Apatemys bellus Apatemys bellus Marsh 1872 eutherian
Theriamorpha - Herpetotheriidae	"Herpetotheriinae indet." = Herpetotheriidae¹ "Herpetotheriinae indet." = Herpetotheriidae¹ Trouessart 1879 marsupial
Dinocerata - Uintatheriidae	? Uintatherium sp. ? Uintatherium sp. Leidy 1872 uintathere

¹Alroy 2002; ²Eaton 1982; ³Hutchison 1991; ⁴Hutchison 2006; ⁵Nelson 1977