Maloney Creek (Pahasapasaurus type locality): Late/Upper Cenomanian, South Dakota
collected by Charles C. Haas and his son, Arthur 1934
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda
- Ammonitida
- Acanthoceratidae
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Dunveganoceras pondi
Haas 1949
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1 individual | |||||||||
Impression | ||||||||||
Chondrichthyes
- Hybodontiformes
- Ptychodontidae
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Ptychodus occidentalis
Leidy 1868
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Teeth | ||||||||||
Chondrichthyes
- Lamniformes
- Anacoracidae
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Squalicorax falcatus
(Agassiz 1843)
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Teeth | ||||||||||
Chondrichthyes
- Lamniformes
- Pseudoscapanorhynchidae
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Cretodus sp.
Sokolov 1965
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Teeth | ||||||||||
Chondrichthyes
- Lamniformes
- Otodontidae
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Cretolamna appendiculata
(Agassiz 1835)
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recombined as Cretalamna appendiculata | ||||||||||
Teeth | ||||||||||
Reptilia
- Plesiosauria
- Polycotylidae
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Pahasapasaurus haasi n. gen., n. sp.
Schumacher 2007
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1 individual | |||||||||
AMM 98.1.1 (holotype, partial skeleton) | ||||||||||
Actinopteri
- Pachycormiformes
- Pachycormidae
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Protosphyraena sp.
Leidy 1857
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Teeth | ||||||||||
Actinopteri
- Crossognathiformes
- Pachyrhizodontidae
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Pachyrhizodus sp.
Agassiz 1850
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Teeth | ||||||||||
Actinopteri
- Aulopiformes
- Enchodontidae
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Enchodus sp.
Agassiz 1835
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Teeth | ||||||||||
see common names |
Geography
Country: | United States | State/province: | South Dakota | County: | Butte County |
Coordinates: | 44.7° North, 103.6° West (view map) | ||||
Paleocoordinates: | 44.0° North, 63.7° West | ||||
Basis of coordinate: | estimated from map |
Time
Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
Key time interval: | Late/Upper Cenomanian | Ammonoid zone: | Dunveganoceras pondi |
Age range of interval: | 99.60000 - 93.50000 m.y. ago |
Stratigraphy
Geological group: | Colorado | Formation: | Greenhorn Limestone | ||
Stratigraphic resolution: | formation | ||||
Stratigraphy comments: "Field notes of C. Haas state that the specimen originated in the “sharkstooth sandstone, Graneros Formation along Maloney Creek, Butte County, South Dakota.” Cobban (1951) reassigned this bed as the base of the Greenhorn Formation, Gries and Martin (1985) referred the unit to the Greenhorn Limestone, and VonLoh and Bell (1998) assigned this as the basal Orman Lake Member of the Greenhorn Formation. At the time Mr. Haas collected the specimen, he had the foresight to retain associated materials from the excavation pit. In the Black Hills and throughout the Western Interior the base of the Greenhorn is marked by characteristic calcarenite (as defined by Folk, 1974) layers, which are rich in shark teeth and other particulate vertebrate material (Hattin, 1975). One slab of calcarenite matrix retained with the specimen bears an impression of the ammonite Dunveganoceras pondi (early late Cenomanian). Numerous teeth of sharks and bony fish were encountered during preparation of the unopened blocks, including Squalicorax falcatus, Cretodus sp., Cretolamna appendiculata, Ptychodus occidentalis, Pachyrhizodus sp., Protosphyraena sp., and Enchodus sp. Examination of the enclosing matrix, identification of associated fossil materials, and photographs taken at the excavation site in 1934 (Fig. 3) conclusively demonstrate that the specimen originated at the base of the Greenhorn Limestone" (Schumacher 2007, p. 134). |
Lithology and environment
Primary lithology: | calcareous sandstone |
Includes fossils? | Y |
Lithology description: In the Black Hills and throughout the Western Interior the base of the Greenhorn is marked by characteristic calcarenite (as defined by Folk, 1974) layers, which are rich in shark teeth and other particulate vertebrate material (Hattin, 1975). | |
Environment: | marine indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | selective quarrying | ||
Reason for describing collection: | taxonomic analysis | ||
Collectors: | Charles C. Haas and his son, Arthur | Collection dates: | 1934 |
Collection method comments: AMM, Adams Memorial Museum collection |
Metadata
Also known as: | Just south of the Belle Fourch River, foughly 6 miles southeast of Fruitdale | ||
Database number: | 117819 | ||
Authorizer: | R. Benson | Enterer: | R. Benson |
Modifier: | R. Benson | Research group: | vertebrate |
Created: | 2011-09-27 04:17:23 | Last modified: | 2013-09-16 03:07:12 |
Access level: | the public | Released: | 2011-09-27 04:17:23 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
37872. | B. A. Schumacher. 2007. A new polycotylid plesiosaur (Reptilia; Sauropterygia) from the Greenhorn Limestone (Upper Cretaceous; lower upper Cenomanian), Black Hills, South Dakota. Geological Society of America Special Paper 427:133-146 [R. Benson/R. Benson] |