USGS 32775, Landover Mall [Severn Fm]: Late/Upper Maastrichtian, Maryland
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda
- Ammonitida
- Scaphitidae
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Jeletzkytes nebrascensis
(Owen 1852)
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Discoscaphites gulosus
(Morton 1834)
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see common names |
Geography
Country: | United States | State/province: | Maryland | County: | Prince Georges |
Coordinates: | 38.8° North, 76.8° West (view map) | ||||
Paleocoordinates: | 39.7° North, 52.8° West | ||||
Basis of coordinate: | based on nearby landmark | ||||
Geographic resolution: | outcrop |
Time
Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 |
Key time interval: | Late/Upper Maastrichtian | Ammonoid zone: | Jeletzkytes nebrascensis |
Age range of interval: | 70.60000 - 66.00000 m.y. ago |
Stratigraphy
Formation: | Severn | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Severn Fm, which regionally overlies the Matawan Fm, and is overlain by the Brightseat Fm. The Severn Fm grades laterally into the Mount Laurel Sand. AGE: Late Maastrichtian on the basis of nannofossil and ammonite biostratigraphy; Jeletzkytes nebrascensis zone. STRATIGRAPHIC POSITION: From unknown position within formation |
Lithology and environment
Primary lithology: | glauconitic lithified argillaceous sandstone |
Includes fossils? | Y |
Lithology description: SPECIFIC LITHOLOGY: Glauconitic gray silty sandstone. LITHIFICATION: Lithified, on the basis of figured specimens. | |
Environment: | coastal indet. |
Geology comments: ENVIRONMENT: Shallow marine siliciclastic setting. |
Taphonomy
Modes of preservation: | cast,mold/impression |
Size of fossils: | macrofossils |
Collection methods and comments
Collection excludes: | some macrofossils |
Collection methods: | surface (in situ),field collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | USNM |
Collection method comments: COLLECTOR: Unknown. REPOSITORY: USNM, Washington DC. | |
Taxonomic list comments:COVERAGE: Exhaustive for cephalopoda, other groups should be present, but are not listed. See PBDB Ref#281 Sohl and Koch (1987) for details. NOMENCLATURE: An authoritative publication, with modern nomenclature and species-resolution identifications. |
Metadata
Database number: | 82404 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Subset of collection #: | 4371 | ||
Created: | 2008-07-27 11:23:56 | Last modified: | 2013-11-25 13:37:23 |
Access level: | the public | Released: | 2008-07-27 11:23:56 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
27761. | W. J. Kennedy, W. A. Cobban, and N. H. Landman. 1997. Maastrichtian ammonites from the Severn Formation of Maryland. American Museum Novitates 3210:1-30 [A. Hendy/A. Hendy] |