78SK34 - Unit 10 (base) (Miocene of the United States)

Also known as B-556

Where: Calvert County, Maryland (38.5° N, 76.5° W: paleocoordinates 38.7° N, 73.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Boston Cliffs Member (Choptank Formation), Serravallian (13.8 - 11.6 Ma)

• STRATIGRAPHIC RELATIONS: From Boston Cliffs Mbr of the Choptank Fm, Chesapeake Grp. AGE: Middle Miocene. STRATIGRAPHIC POSITION: From base of unit 10.

• bed-level stratigraphic resolution

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

• ENVIRONMENT: Shallow marine siliciclastic.
• SPECIFIC LITHOLOGY: Hashy, shell-supported fine 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 Unpublished PhD thesis, Yale University 1-511 [A. Hendy/A. Hendy/A. Hendy]more details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 79112: 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
Thecostraca
 Balanomorpha - Balanidae
"Balanus concavus" = Concavus concavus
"Balanus concavus" = Concavus concavus Bronn 1831 barnacle
Gastropoda
 Cerithioidea - Turritellidae
"Turritella plebeia" = Mariacolpus plebeia
"Turritella plebeia" = Mariacolpus plebeia Say 1824 turret shell
 Neotaenioglossa - Calyptraeidae
Crepidula fornicata Linnaeus 1758 slipper shell
Crucibulum sp. Schumacher 1817 slipper shell
 Sorbeoconcha - Vermetidae
"Vermetus graniferus" = Serpulorbis granifera
"Vermetus graniferus" = Serpulorbis granifera Say 1824 worm shell
 Neogastropoda - Muricidae
Ecphora sp. Conrad 1843 murex snail
 Trochoidea - Trochidae
Calliostoma aphelium Dall 1892 top snail
Bivalvia
 Pectinida - Pectinoidae
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens Ward and Blackwlder 1975 scallop
 Ostreida - Malleidae
Isognomon maxillata Lamarck 1819 oyster
 Arcida - Arcidae
Anadara sp. Gray 1847 ark
 Mytilida - Mytilidae
Modiolus ducatellii Conrad 1840 mussel
 Pholadida - Corbulidae
Bicorbula idonea, "Caryocorbula inaequalis" = Corbula inaequalis
Bicorbula idonea Conrad 1833 clam
"Caryocorbula inaequalis" = Corbula inaequalis Say 1824 clam
 Cardiida - Veneridae
Mercenaria sp. Schumacher 1817 quahog
or Callista
Mercenaria campechiensis Gmelin 1791 quahog
Dosinia acetabulum Conrad 1832 venus clam
Petricola calvertensis Dall 1900 venus clam
Pitar ? subnasuta venus clam
 Cardiida - Mactridae
Spisula subparilis Conrad 1841 clam
 Cardiida - Cardiidae
"Cerastoderma laqueatum" = Chesacardium laqueatum
"Cerastoderma laqueatum" = Chesacardium laqueatum Conrad 1830 cockle
 Cardiida - Semelidae
Semele ? carinata Conrad 1830 clam
 Carditida - Carditidae
"Carditamera protracta" = Cardita protracta
"Carditamera protracta" = Cardita protracta Conrad 1843 clam
 Carditida - Crassatellidae
"Eucrassatella turgidulus" = Marvacrassatella turgidula
"Eucrassatella turgidulus" = Marvacrassatella turgidula Conrad 1843 clam
 Carditida - Astartidae
Astarte thisphila Glenn 1904 clam