Bridgeton - Kirkwood Formation (Miocene of the United States)

Where: Cumberland County, New Jersey (39.4° N, 75.2° W: paleocoordinates 39.6° N, 70.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Kirkwood Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• No lithostratigraphic details or stratigraphic relationships provided in text. Equivalent in age and slightly older than the Calvert Formaiton of Maryland and Virginia. Overlain by the Cohansey Sand with a time transgressive contact, Kirkwood Formation is Burdigalian-Langhian in age.

• member-level stratigraphic resolution

Environment/lithology: coastal; unlithified, argillaceous, silty mudstone and pebbly sandstone

• No geologic or paleoenvironmental data reported in text. Deposited in a sublittoral to nearshore environments
• No lithologic data reported in text. Clayey to silty mudrock, massive sand, and thin pebble lenses.

Size class: macrofossils

Reposited in the USNM

• Collections reposited in USNM and USGS collections. From Richards and Harbison (1942: "Whitfield frequently speaks of a "stony layer" near Bridgeton and many of the fossulks in the various museums labelled "Bridgeton" are in the sandstone phase of the Kirkwood. The exact locality of the fossils was not given and no exposures can be found in the vicinityyu of Bridgeton today."

Primary reference: H. G. Richards and A. Harbison. 1942. Miocene invertebrate fauna of New Jersey. Proceedings of the Academy of Natural Sciences of Philadelphia 94:167-250 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 59337: authorized by Austin Hendy, entered by Austin Hendy on 26.03.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for Gastropoda, Bivalvia and Scaphopoda. Nomenclature is somewhat antiquated but provided to species resolution and authoritative.
 Nuculida - Nuculidae
"Nucula proxima" = Nucula (Nucula) proxima
"Nucula proxima" = Nucula (Nucula) proxima Say 1820 Atlantic Nut Clam
 Mytilida - Mytilidae
"Modiola inflata" = Modiolus ducatellii
"Modiola inflata" = Modiolus ducatellii Conrad 1840 mussel
 Arcida - Arcidae
"Arca centenaria" = Striarca centenaria
"Arca centenaria" = Striarca centenaria Say 1824 clam
 Arcida - Glycymerididae
Glycymeris parilis Conrad 1843 clam
 Ostreida - Malleidae
"Melina maxillata" = Isognomon maxillata
"Melina maxillata" = Isognomon maxillata Lamarck 1819 oyster
 Cardiida - Cardiidae
"Cardium patuxentium" = Chesacardium craticuloides
"Cardium patuxentium" = Chesacardium craticuloides Conrad 1845 cockle
 Cardiida - Ungulinidae
Diplodonta shilohensis Dall 1900 clam
 Carditida - Carditidae
"Cardita arata" = Carditamera arata
"Cardita arata" = Carditamera arata Conrad 1832 clam
 Carditida - Astartidae
Astarte distans Conrad 1862 clam
 Carditida - Crassatellidae
"Eucrassatella melina" = Marvacrassatella melina
"Eucrassatella melina" = Marvacrassatella melina Conrad 1832 clam
 Neotaenioglossa - Calyptraeidae
Crepidula fornicata Linnaeus 1758 slipper shell
"Calyptraea aperta" = Calyptraea (Trochita) aperta Solander 1766 slipper shell
"Crucibulum costatum" = Crucibulum (Dispotaea) costata Say 1820 slipper shell
 Discinida - Disciniidae
Discinisca lugubris Conrad 1834