USGS 28888, W of bridge over Beltway [Severn Fm] (Cretaceous of the United States)

Where: Prince Georges County, Maryland (38.8° N, 76.8° W: paleocoordinates 39.7° N, 52.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Jeletzkytes nebrascensis ammonoid zone, Severn Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• 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

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, glauconitic, argillaceous sandstone

• ENVIRONMENT: Shallow marine siliciclastic setting.
• SPECIFIC LITHOLOGY: Glauconitic gray silty sandstone. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: cast, mold/impression

Reposited in the USNM

Collection methods: surface (in situ),

• COLLECTOR: Unknown. REPOSITORY: USNM, Washington DC.

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 82402: authorized by Austin Hendy, entered by Austin Hendy on 27.07.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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.
Cephalopoda
 Ammonitida - Scaphitidae
Jeletzkytes nebrascensis Owen 1852 ammonite