USGS 13410, north of Washington: Late/Upper Campanian, Arkansas
collected by Stephenson 1925
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Echinoidea
- Spatangoida
- Hemiasteridae
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Hemiaster wetherbyi
de Loriol 1887
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Cephalopoda
- Ammonitida
- Scaphitidae
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Hoploscaphites pumilis
(Stephenson 1941)
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Kennedy and Cobban 1993 | ||||||
| recombined as Hoploscaphites pumilus | |||||||
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Cephalopoda
- Ammonitida
- Baculitidae
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Baculites ovatus
(Say 1820)
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Kennedy and Cobban 1993 | ||||||
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Cephalopoda
- Ammonitida
- Nostoceratidae
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Nostoceras (Nostoceras) hyatti
(Stephenson 1941)
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Kennedy and Cobban 1993 | ||||||
| original and current combination Nostoceras hyatti | |||||||
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Nostoceras (Nostoceras) helicinum
(Shumard 1861)
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Kennedy and Cobban 1993 | ||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Arkansas | County: | Howard |
| Coordinates: | 33.8° North, 93.7° West (view map) | ||||
| Paleocoordinates: | 37.9° North, 65.4° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 |
| Key time interval: | Late/Upper Campanian | Ammonoid zone: | Nostoceras hyatti |
| Age range of interval: | 83.60000 - 72.10000 m.y. ago |
Stratigraphy
| Geological group: | Navarro | Formation: | Saratoga Chalk | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Saratoga Chalk, which regionally overlies the Marlbrook Marl, and is overlain by the Nacatoch Sand Fm, all of the Navarro Gp. AGE: Late Campanian on the basis of ammonite biostratigraphy; Nostoceras hyatti zone. STRATIGRAPHIC POSITION: From unknown position within formation of 6-16 m in thickness. | |||||
Lithology and environment
| Primary lithology: | lithified lime mudstone |
| Secondary lithology: | lithified calcareous sandstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Chalk and calcareous sand. LITHIFICATION: Lithified, on the basis of figured specimens. | |
| Environment: | carbonate indet. |
| Geology comments: ENVIRONMENT: Shallow marine cabonate setting. | |
Taphonomy
| Modes of preservation: | cast,mold/impression |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
Collection methods and comments
| Collection excludes: | some macrofossils | ||
| Collection methods: | surface (in situ),field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | USNM | ||
| Collectors: | Stephenson | Collection dates: | 1925 |
| Collection method comments: COLLECTOR: L.W. Stephenson, 1925. REPOSITORY: USNM, Washington DC. | |||
| Taxonomic list comments:COVERAGE: Exhaustive for ammonoids, other groups may be present, but are not listed. NOMENCLATURE: An authoritative publication, with modern nomenclature and species-resolution identifications. | |||
Metadata
| Database number: | 83038 | ||
| Authorizer: | A. Hendy, M. Clapham | Enterer: | A. Hendy, M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2008-08-06 09:07:43 | Last modified: | 2018-11-19 22:15:59 |
| Access level: | the public | Released: | 2008-08-06 09:07:43 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 26335. | 1% 20600 | C. W. Cooke. 1953. American Upper Cretaceous Echinoidea. United States Geological Survey Professional Paper 254-A:1-44 [W. Kiessling/U. Merkel/M. Clapham] |
Secondary references:
| 27893 | W. J. Kennedy and W. A. Cobban. 1993. Ammonites from the Saratoga Chalk (Upper Cretaceous), Arkansas. Journal of Paleontology 67(3):404-434 [A. Hendy/A. Hendy] |