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
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 82399: authorized by Austin Hendy, entered by Austin Hendy on 27.07.2008
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Jeletzkytes nebrascensis Owen 1852 ammonite | |
Sphenodiscus lobatus Tuomey 1856 ammonite |