Bloom Basin Local Fauna: Orellan, South Dakota

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Aves indet. Linnaeus 1758
Reptilia - Boidae
Calamagras angulatus Cope 1873
Reptilia
Lacertilia indet. (Owen 1842)
Reptilia - Testudines - Testudinidae
Testudinidae indet. Batsch 1788
Reptilia - Testudines - Trionychidae
Apalone sp. Rafinesque 1832
Mammalia - Leptictidae
Megaleptictis altidens Meehan and Martin 2012
Mammalia - Creodonta - Hyaenodontidae
Hyaenodon sp. Laizer and Parieu 1838
Mammalia - Carnivora - Amphicyonidae
Daphoenus sp. Leidy 1853
Mammalia - Carnivora - Canidae
Hesperocyon gregarius (Cope 1873)
Mammalia - Carnivora - Nimravidae
Dinictis sp. (Leidy 1854)
Mammalia - Carnivora - Palaeogalidae
Palaeogale sectoria (Gervais 1848)
Mammalia - Perissodactyla - Equidae
Mesohippus sp. Marsh 1875
Mammalia - Perissodactyla - Rhinocerotidae
Subhyracodon sp. Wood 1927
Mammalia - Entelodontidae
Archaeotherium sp. Leidy 1850
Mammalia - Merycoidodontidae
Merycoidodon culbertsoni (Leidy 1848)
original and current combination Merycoidodon culbertsonii
Mammalia - Hypertragulidae
Hypertragulidae indet. Cope 1879
Hypertragulus calcaratus (Cope 1873)
Mammalia - Leptomerycidae
Leptomeryx sp. Leidy 1853
Leptomeryx evansi Leidy 1853
Mammalia - Lagomorpha - Leporidae
Leporidae indet. Fischer de Waldheim 1817
Megalagus sp. Walker 1931
Palaeolagus haydeni Leidy 1856
Mammalia - Rodentia - Aplodontidae
cf. Brachygaulus sp. Korth and Tabrum 2011
Mammalia - Rodentia - Eutypomyidae
Eutypomys cf. thomsoni Matthew 1905
Mammalia - Rodentia - Heliscomyidae
Heliscomyidae indet. Korth et al. 1991
Mammalia - Rodentia - Eomyidae
Adjidaumo lophatus Korth 2012
Mammalia - Rodentia - Ischyromyidae
Ischyromys sp. Leidy 1856
see common names

Geography
Country:United States State/province:South Dakota County:Pennington
Coordinates: 43.9° North, 102.2° West (view map)
Paleocoordinates:45.0° North, 93.9° West
Basis of coordinate:estimated from map
Time
Period:Paleogene Epoch:Oligocene
Stage:Rupelian 10 m.y. bin:Cenozoic 4
Key time interval:Orellan Mammal zone: Or1
Age range of interval:33.90000 - 31.80000 m.y. ago
Stratigraphy
Stratigraphy comments: "...These data suggest that the Chadronian–Orellan boundary may be located within the upper Chadron Formation in South Dakota if a complete stratigraphic section were preserved. Therefore, recogni- tion of an earliest Orellan fauna situated below the BBLB would not necessarily contradict prior placement of the BBLB within the upper-most Chadron Formation or at the Chadron–Brule contact. However, that placement would require the sediments containing the Bloom Basin local fauna to be correlative with the Big Cottonwood Creek Member of Nebraska. Alternatively, the age of the Bloom Basin local fauna may indicate that the BBLB is posi- tioned stratigraphically higher than previously proposed, within the Scenic Member of the Brule Formation..."
Lithology and environment
Primary lithology: not reported
Secondary lithology: "limestone"
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection methods:surface (float),surface (in situ),mechanical,field collection
Minimum sieve size:0.500
Reason for describing collection:general faunal/floral analysis
Metadata
Also known as:BADL-LOC-0293
Database number:163487
Authorizer:J. Marcot Enterer:J. Marcot
Research group:vertebrate
Created:2014-10-30 19:12:11 Last modified:2014-10-30 19:12:11
Access level:the public Released:2014-10-30 19:12:11
Creative Commons license:CC BY
Reference information

Primary reference:
53322. C. A. Boyd and E. Welsh. 2014. Description of an Earliest Orellan Fauna From Badlands National Park, Interior, South Dakota and Implications for the Stratigraphic Position of the Bloom Basin Limestone Bed. Dakoterra 6:124-147 [J. Marcot/J. Marcot]