78SK74 - Unit E (Miocene of the United States)

Also known as B-521

Where: Calvert County, Maryland (38.4° N, 76.6° W: paleocoordinates 38.6° N, 73.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Drumcliff Member (Choptank Formation), Middle Miocene (16.0 - 11.6 Ma)

• STRATIGRAPHIC RELATIONS: From Drumcliff Mbr of the Choptank Fm, Chesapeake Grp. AGE: Middle Miocene. STRATIGRAPHIC POSITION: From unit 4.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, fine-grained, medium, shelly/skeletal, silty sandstone

• ENVIRONMENT: Shallow marine siliciclastic.
• SPECIFIC LITHOLOGY: Fine-medium silty sand. LITHIFICATION: Unlithified, based on visual inspection of collection by enterer.

Size class: macrofossils

Collected by Kidwell in 1978; reposited in the YPM

Collection methods: bulk, sieve,

• COLLECTOR: S.K. Kidwell, 1978. REPOSITORY: Peabody Museum of Natural History, Yale University.

Primary reference: S. M. Kidwell. 1982. Stratigraphy, invertebrate taphonomy and depositional history of the Miocene Calvert and Choptank Formations, Atlantic Coastal Plain. Unpublished PhD thesis, Yale University 1-511 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 79103: authorized by Austin Hendy, entered by Austin Hendy on 25.02.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda, bivalvia, and scaphopoda. NOMENCLATURE: Somewhat modern. Identifications are based on Martin (1904) for gastropods and bivalves, with revisions following subsequent publications.
Malacostraca
 Decapoda -
Decapoda indet. Latreille 1802 decapod
Maxillopoda
 Sessilia - Balanidae
Polychaeta
 Spionida - Spionidae
Polydora sp. Bosk 1801
Bivalvia
 Arcida - Arcidae
"Anadara staminea" = Dallarca staminea
"Anadara staminea" = Dallarca staminea Say 1832 clam
 Pectinida - Pectinoidae
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens, "Placopecten marylandicus" = Placopecten marylandica
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens Ward and Blackwlder 1975 scallop
"Placopecten marylandicus" = Placopecten marylandica Wagner 1839 scallop
 Pectinida - Anomiidae
Anomia sp. Linnaeus 1758 jingle
 Ostreida - Malleidae
Isognomon maxillata Lamarck 1819 oyster
 Mytilida - Mytilidae
 Carditida - Astartidae
Astarte thisphila Glenn 1904 clam
 Carditida - Crassatellidae
"Eucrassatella turgidulus" = Marvacrassatella turgidula
"Eucrassatella turgidulus" = Marvacrassatella turgidula Conrad 1843 clam
 Pholadida - Corbulidae
Caryocorbula cuneata Say 1824 clam
"Caryocorbula inaequalis" = Corbula inaequalis Say 1824 clam
Bicorbula idonea Conrad 1833 clam
 Pholadida - Pholadidae
Martesia ovalis Say 1820 clam
 Cardiida - Glossidae
Glossus fraterna Say 1824 clam
 Cardiida - Mactridae
Spisula subparilis Conrad 1841 clam
 Cardiida - Veneridae
Mercenaria sp. Schumacher 1817 quahog
Dosinia acetabulum Conrad 1832 venus clam
? Pitar subnasuta venus clam
 Cardiida - Tellinidae
Tellina sp. Linnaeus 1758 tellin clam
 Cardiida - Semelidae
Semele sp. Schumacher 1817 clam
 Cardiida - Cardiidae
"Cerastoderma laqueatum" = Chesacardium laqueatum
"Cerastoderma laqueatum" = Chesacardium laqueatum Conrad 1830 cockle
 Cardiida - Galeommatidae
 Cardiida - Lasaeidae
Aligena aequata Conrad 1843 aligena
 Hiatellida - Hiatellidae
Panopea americana Conrad 1838 clam
 Lucinida - Lucinidae
"Parvilucina crenulatus" = Parvilucina crenulata
"Parvilucina crenulatus" = Parvilucina crenulata Conrad 1840 clam
Gastropoda
 Neogastropoda - Buccinidae
"Siphonalia" sp. Adams 1863 true whelk
 Neogastropoda - Cancellariidae
"Cancellaria" sp. Lamarck 1799 snail
 Neogastropoda - Marginellidae
Marginella minuta Pfeiffer 1840 margin shell
 Neogastropoda - Muricidae
Ecphora sp. Conrad 1843 murex snail
 Neogastropoda - Drilliidae
Drillia sp. Gray 1838 snail
 Neogastropoda - Turridae
Turridae indet., ""Surcula" sp." = Turricula
Turridae indet. Swainson 1840 turrid
""Surcula" sp." = Turricula Schumacher 1817 turrid
 Neogastropoda - Terebridae
Terebra inornata Whitfield 1894 auger snail
 Naticoidea - Naticidae
"Lunatia heros" = Euspira heros, "Polinices duplicatus" = Neverita duplicatus
"Lunatia heros" = Euspira heros Say 1822 moon snail
"Polinices duplicatus" = Neverita duplicatus Say 1822 moon snail
 Calyptraeoidea - Calyptraeidae
Crucibulum multilineatum Conrad 1842 slipper shell
Crepidula sp. Lamarck 1799 slipper shell
 Sorbeoconcha - Turritellidae
"Turritella variabilis" = Turritella (Torcula) variabilis, "Turritella plebeia" = Mariacolpus plebeia
"Turritella variabilis" = Turritella (Torcula) variabilis Conrad 1830 turret shell
"Turritella plebeia" = Mariacolpus plebeia Say 1824 turret shell
 Trochoidea - Trochidae
Calliostoma sp. Swainson 1840 top snail
Calliostoma philanthropus Conrad 1834 top snail
Demospongea
 Clavulina - Clionaidae
Entobia sp. Bronn 1838 demosponge