Powder Wash (Upper) (Eocene of the United States)
Also known as Powder Springs
Where: Uintah County, Utah (40.2° N, 109.9° W: paleocoordinates 44.2° N, 96.4° W)
• coordinate based on political unit
• small collection-level geographic resolution
When: Douglas Creek Member (Green River Formation), Bridgerian (50.3 - 46.2 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: channel lag; sandstone
• 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)
• "a uniformly muddy, fine-grained sublitharenite" (Gunnell and Bartels 1999)
Size classes: macrofossils, mesofossils
Primary reference: 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]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 16396: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Patricia Holroyd
Creative Commons license: CC BY (attribution)
Taxonomic list
• 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
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
Show authors, comments, and common names
| Mammalia | |
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Peradectes chesteri Gazin 1952 marsupial
Armintodelphys dawsoni Krishtalka and Stucky 1983 marsupial | |
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Palaeictops bridgeri Simpson 1959 eutherian | |
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Mesonychidae indet. Cope 1875 condylarth | |
"Homacodontinae indet." = Homacodontidae, Antiacodon pygmaeus
Antiacodon pygmaeus Cope 1872 even-toed ungulate includes "cf. Neodiacodexis sp." of West 1984 according to Stucky 1998; see also Burke 1969
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Hyracotherium vasacciense Cope 1872 odd-toed ungulate | |
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Helaletes nanus Marsh 1871 odd-toed ungulate | |
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Hyrachyus modestus Leidy 1870 odd-toed ungulate | |
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Miacis cf. parvivorus Cope 1872 placental | |
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Viverravus gracilis Marsh 1872 placental
Viverravus sicarius Matthew 1909 placental
Viverravus minutus Wortman 1901 placental | |
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? Oodectes sp. Wortman 1901 placental | |
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Limnocyon cf. verus Marsh 1872 creodont | |
"Scenopagus priscus" = Nyctitherium priscum, "Talpavus nitidus" = Nyctitherium nitidum, Nyctitherium serotinum
"Scenopagus priscus" = Nyctitherium priscum Marsh 1872 placental
"Talpavus nitidus" = Nyctitherium nitidum Marsh 1872 placental | |
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Centetodon bembicophagus Lillegraven et al. 1981 placental | |
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Aethomylos simplicidens Novacek 1976 placental | |
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Pantolestes cf. longicaudus Cope 1872 placental | |
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Sciuravidae indet. Miller and Gidley 1918 rodent
Sciuravus eucristadens Burke 1937 rodent includes "Microparamys sp. C" of Wood 1962: see Dawson 1968, Korth 1984
Pauromys sp. Troxell 1923 rodent | |
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Paramys delicatus Leidy 1871 rodent
Microparamys minutus Wilson 1937 rodent | |
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Uintasorex cf. parvulus Matthew 1909 primate
Microsyops sp. Leidy 1872 primate | |
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Omomys carteri Leidy 1869 tarsier
Anaptomorphus aemulus Cope 1872 tarsier | |
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Smilodectes gracilis Marsh 1871 primate | |
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Apatemys cf. bellulus Marsh 1872 eutherian
Apatemys cf. bellus Marsh 1872 eutherian
Apatemys cf. rodens Troxell 1923 eutherian | |
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Trogosus sp. Leidy 1871 tillodont | |
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Palaeoryctinae indet. Winge 1917 eutherian | |
| Reptilia | |
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"Pristichampsus vorax" = Boverisuchus vorax5
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| Scenopagus edenensis | |
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Scenopagus edenensis McGrew et al. 1959 | |