Powder Wash (Upper): Bridgerian, Utah

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
(4 measurements)
(6 measurements)
Alroy 2002
(6 measurements)
    = Copedelphys innominata Simpson 1928
Alroy 2002
Mammalia - Leptictidae
Mammalia - Apatemyidae
Mammalia - Esthonychidae
Trogosus sp. Leidy 1871
Mammalia - Proteutheria - Palaeoryctidae
Mammalia - Condylarthra - Hyopsodontidae
Gazin 1968
confirmed by Redline 1997
Mammalia - Rodentia - Sciuravidae
Sciuravidae indet. Miller and Gidley 1918
includes "Microparamys sp. C" of Wood 1962: see Dawson 1968, Korth 1984
Mammalia - Rodentia - Ischyromyidae
Microparamys minutus (Wilson 1937)
Paramys delicatus Leidy 1871
(1 measurement)
Korth 1985
replaces ID of Dawson 1968
Mammalia - Primates - Microsyopidae
Microsyops sp. Leidy 1872
(4 measurements)
Mammalia - Primates - Omomyidae
includes one specimen of Utahia kayi: Szalay 1976
see Gazin 1958a (2 measurements)
see Gazin 1958a
Mammalia - Primates - Notharctidae
sensu Gingerich 1979a
Mammalia - Sespedectidae
Alroy 2002
Mammalia - Geolabididae
not listed by Lillegraven et al. 1981
Mammalia - Apternodontidae
    = Apternodontidae indet. Matthew 1910
Alroy 2003
genus name was used sensu Romer 1966, not Thewissen and Gingerich 1989, as noted by Bloch (pers. commun. 30.8.03)
Mammalia - Nyctitheriidae
described by Krishtalka 1976b (5 measurements)
Mammalia - Pantolestidae
Mammalia
Mammalia - Acreodi - Mesonychidae
Mammalia - Viverravidae
Mammalia
Gunnell 1998
"Tritemnodon cf.
Mammalia - Miacidae
said to be a new genus
Alroy 2002
Mammalia - Hyaenodonta - Hyaenodontidae
Gunnell 1998
Sinopa grangeri Matthew 1906
Alroy 2002
    = Sinopa rapax Leidy 1871
Alroy 2002
Gunnell 1998
Mammalia - Hyaenodonta
Mammalia - Homacodontidae
said to be new
includes "cf. Neodiacodexis sp." of West 1984 according to Stucky 1998; see also Burke 1969 (1 measurement)
Mammalia - Perissodactyla - Palaeotheriidae
Mammalia - Perissodactyla - Hyrachyidae
Mammalia - Perissodactyla
Mammalia - Chiroptera - Natalidae
a bat
Reptilia
Booidea indet. Gray 1825
Gunnell and Bartels 1999
Gunnell and Bartels 1999
Reptilia - Iguanidae
Gunnell and Bartels 1999
Gunnell and Bartels 1999
Reptilia
Gunnell and Bartels 1999
Reptilia - Anguidae
Gunnell and Bartels 1999
Gunnell and Bartels 1999
Gunnell and Bartels 1999
Reptilia - Xantusiidae
Gunnell and Bartels 1999
spelled "Paleoxantusia"
Reptilia
Pristichampsus vorax (Troxell 1925)
Gunnell and Bartels 1999
Gunnell and Bartels 1999
Reptilia - Testudines - Geoemydidae
Gunnell and Bartels 1999
Reptilia - Testudines
Gunnell and Bartels 1999
Reptilia - Testudines - Trionychidae
Gunnell and Bartels 1999
unclassified
see common names

Geography
Country:United States State/province:Utah County:Uintah
Coordinates: 40.2° North, 109.9° West (view map)
Paleocoordinates:47.8° North, 87.0° West (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:small collection
Time
Period: Paleogene Epoch: Eocene
10 m.y. bin: Cenozoic 2
*Period:Tertiary
Key time interval: Bridgerian
Age range of interval: 50.5 - 46.2 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Green River Member:Douglas Creek
Local section:PwdrW Local bed:3
Local order:bottom to top
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology: sandstone
Lithology description: "a uniformly muddy, fine-grained sublitharenite" (Gunnell and Bartels 1999)
Environment:channel lag
Geology comments: the "association of hard, dense, bony elements in a sandstone suggests a lag deposit within a channel or splay... [perhaps] a small meandering stream channel, a lake-margin (deltaic) distributary channel, or the basal portion of a crevasse splay" (Gunnell and Bartels 1999)
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Articulated whole bodies:none
Associated major elements:none
Disassociated major elements:some
Disassociated minor elements:many
Spatial resolution:allochthonous
Collection methods and comments
Collection size:1700 specimens
Reason for describing collection:general faunal/floral analysis
Taxonomic list comments:sec 8 T 7S R 25E: Van Houten 1945
same as the "Green River" fauna of Burke 1935 and Kay 1957
according to Remy 1992 there is an Ar-Ar date of 47.2 Ma on the "curly tuff... between the S1 marker unit and the Magohany oil shale bed" (S1 unit is lower); because the fauna is from "82 m below" the shale and the date is interpreted by Remy as Uintan, I assume it is too young for use as a calibration point
"Class 1" reliability K-Ar date of 44.8 (= 46.0) +/- 0.9 Ma (Mauger 1977) for the Wavy Tuff is definitely too young for use as the tuff is 20 ft above the Mahogany Oil Shale; Wavy Tuff redated at 42.3 +/- 2.0 (FT on zircon) by Bryant et al. 1989
original list repeated almost without modification by Gunnell and Bartels 1999
Black and Sutton list the following: Thisbemys corrugatus "Leptotomus bridgerensis"
falls in the Parachute Creek Mbr. sensu Roehloer 1992
early Bridgerian
the record of Apatemys hendryi reported by Robinson 1966b is omitted without comment by K & S
Metadata
Also known as:Powder Springs
Database number:16396
Authorizer:J. Alroy, P. Holroyd Enterer:J. Alroy, P. Holroyd
Modifier:J. Alroy Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2025-02-22 15:12:02
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC0
Reference information

Primary reference:
2182. L. Krishtalka and R. K. Stucky. 1984. Middle Eocene marsupials (Mammalia) from northeastern Utah and the mammalian fauna from Powder Wash. Annals of Carnegie Museum 53(2):31-46 [J. Alroy/J. Alroy/M. Uhen]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
16195% 40780C. L. Gazin. 1968. A study of the Eocene condylarthran mammal Hyopsodus. Smithsonian Miscellaneous Collections 153(4):1-90 [J. Alroy/J. Alroy/J. Head]
1735 G. F. Gunnell. 1998. Creodonta. In C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America, Volume 1: Terrestrial Carnivores, Ungulates, and Ungulate like Mammals [J. Alroy/J. Alroy/J. Orcutt]
1741 G. F. Gunnell and W. S. Bartels. 1999. Middle Eocene vertebrates from the Uinta Basin, Utah, and their relationship with faunas from the southern Green River Basin, Wyoming. Utah Geological Survey Miscellaneous Publication 99-1:429-442 [J. Alroy/J. Alroy/J. Alroy]
2106 W. W. Korth. 1985. The Rodents Pseudotomus and Quadratomus and the Content of the Tribe Manitshini (Paramyinae, Ischyromyidae). Journal of Vertebrate Paleontology 5(2):139-152 [J. Alroy/J. Alroy/J. Ju]