78SK14 - Unit 8 (base) (Miocene of the United States)

Also known as B-504

Where: Calvert County, Maryland (38.6° N, 76.5° W: paleocoordinates 38.9° N, 72.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Plum Point Member (Calvert Formation), Burdigalian (20.4 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: From Plum Point Mbr of the Calvert Fm, Chesapeake Grp. AGE: Middle Miocene. STRATIGRAPHIC POSITION: From base of unit 8.

• bed-level stratigraphic resolution

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

• ENVIRONMENT: Shallow marine siliciclastic.
• SPECIFIC LITHOLOGY: 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 Unpublished PhD thesis, Yale University 1-511 [A. Hendy/A. Hendy/A. Hendy]more details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: taxonomic analysis

PaleoDB collection 79102: 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.
Scaphopoda
 Gadilida - Gadilidae
Cadulus thallus Conrad 1834 tusk shell
Gastropoda
 Cerithioidea - Turritellidae
"Turritella variabilis" = Turritella (Torcula) variabilis
"Turritella variabilis" = Turritella (Torcula) variabilis Conrad 1830 turret shell
 Neotaenioglossa - Calyptraeidae
Calyptraeidae indet. Lamarck 1809 slipper shell
Crepidula fornicata Linnaeus 1758 slipper shell
 Epitonioidea - Epitoniidae
""Scala" sayana" = Epitonium humphreysii
""Scala" sayana" = Epitonium humphreysii Kiener 1838 wentletrap
 Sorbeoconcha - Naticidae
"Lunatia heros" = Euspira heros
"Lunatia heros" = Euspira heros Say 1822 moon snail
Bivalvia
 Nuculanida - Nuculanidae
Nuculana luciata pointed nut clam
SUBSPECIES: Nuculana luciata amydia
 Mytilida - Mytilidae
 Pectinida - Pectinoidae
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens Ward and Blackwlder 1975 scallop
 Pectinida - Anomiidae
Anomia simplex d'Orbigny 1845 jingle
 Arcida - Arcidae
 Arcida - Glycymerididae
Glycymeris parilis Conrad 1843 clam
 Cardiida - Veneridae
"Chione latilirata" = Lirophora (Lirophora) latilirata Conrad 1841 venus clam
Dosinia acetabulum Conrad 1832 venus clam
Mercenaria sp. Schumacher 1817 quahog
 Pholadida - Corbulidae
"Corbula elevata" = Varicorbula elevata
"Corbula elevata" = Varicorbula elevata Conrad 1838 clam
 Pholadida - Teredinidae
"Kuphus" sp. Guettard 1770 clam
 Hiatellida - Hiatellidae
Panopea sp. Menard 1807 clam
 Lucinida - Lucinidae
"Parvilucina crenulatus" = Parvilucina crenulata
"Parvilucina crenulatus" = Parvilucina crenulata Conrad 1840 clam
Thecostraca
 Balanomorpha - Balanidae
"Balanus concavus" = Concavus concavus
"Balanus concavus" = Concavus concavus Bronn 1831 barnacle