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
Jeletzkytes nebrascensis (Owen 1852)
Discoscaphites gulosus (Morton 1834)
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]