St Georges, near [Mount Laurel Fm] (Cretaceous of the United States)

Where: New Castle County, Delaware (39.6° N, 75.7° W: paleocoordinates 39.0° N, 45.6° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Marshalltown Formation, Middle Campanian (83.5 - 70.6 Ma)

• COMMENTS: Underlain by Marshalltown Formation (burrowed quartz sand) - collection 35048. AGE: Late Campanian, on the basis of ammonoid biostratigraphy; Didymoceras stevensoni-Exiteloceras jenneyi zone. PJW: This is for the overlying Mount Laurel formation; for the Marshalltown, the authors write: “In the Western Interior, Menuites portlocki complexus occurs in the upper part of the zone of Baculites gregoryensis and in the lower part of the overlying zone of B. scotti.”

• formation-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; burrowed, glauconitic, brown, gray, argillaceous, silty sandstone

• See Owens and Minard (1970) for detailed geologic data on geology of Chesapeake and Delaware Canal area. "probable lower shoreface environment"
• "Largely a light gray to reddish-brown quart sand that usually conatins very little glauconite"' "...fine-grained, massive..."

Size class: macrofossils

Preservation: trace, replaced with phosphate

Reposited in the AMNH, UNSM

• Collections by local amateur paleontology organisationsl collections from spoil heaps along canal west of Saint Georges, DE

Primary reference: W. J. Kennedy and W.A. Cobban. 1997. Upper Campanian (Upper Cretaceous) ammonites from the Marshalltown Formation-Mount Laurel boundary beds in Delaware. Journal of Paleontology 71(1):62-73 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 35049: authorized by Austin Hendy, entered by Austin Hendy on 28.10.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

• Compilation of taxonomic descriptions of ammonoids, and other taxa mentioned in text
 Ammonitida - Nostoceratidae
Nostoceras (Nostoceras) sp. Hyatt 1894 ammonite
Not Nostoceras (N.) monotuberculatum
"Nostoceras (Nostoceras) monotuberculatum" = Nostoceras monotuberculatum Kennedy and Cobban 1993 ammonite
Exiteloceras jenneyi Whitfield 1877 ammonite
Didymoceras platycostatum Kennedy and Cobban 1993 ammonite
Didymoceras stevensoni Whitfield 1877 ammonite
 Ostreida - Gryphaeidae