USGS Loc. 16225, Summit Bridge [Merchantville Fm] (Cretaceous of the United States)

Where: New Castle County, Delaware (39.5° N, 75.7° W: paleocoordinates 39.0° N, 45.7° W)

• coordinate stated in text

• local area-level geographic resolution

When: Merchantville Formation, Early/Lower Campanian (83.5 - 70.6 Ma)

• STRATIGRAPHIC RELATIONS: From the Merchantville Fm, which is overlain by the Englishtown Fm. AGE: Early Campanian, on the basis of ammonoid biostratigraphy. STRATIGRAPHIC POSITION: From unknown part of formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, quartzose, silty sandstone

• SPECIFIC LITHOLOGY: Silty quartz sand. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: mold/impression

Reposited in the USNM

Collection methods: salvage,

• COLLECTOR: Not stated in text. REPOSITORY: USNM.

Primary reference: W. J. Kennedy and W. A. Cobban. 1993. Lower Campanian (Upper Cretaceous) ammonites from the Merchantville Formation of New Jersey, Maryland, and Delaware. Journal of Paleontology 67(5):828-849 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88609: authorized by Austin Hendy, entered by Austin Hendy on 16.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to ammonoids. NOMENCLATURE: Authoritative publication, with modern nomenclature, and species-resolution identifications.
 Ammonitida - Muniericeratidae
 Ammonitida - Placenticeratidae
Placenticeras placenta DeKay 1828 ammonite
 Ammonitida - Collignoniceratidae
Submortoniceras uddeni Young 1963 ammonite
 Ammonitida - Scaphitidae
"Scaphites (Scaphites) hippocrepis" = Scaphites hippocrepis
"Scaphites (Scaphites) hippocrepis" = Scaphites hippocrepis DeKay 1828 ammonite