78SK74 - Unit 1 (Miocene of the United States)

Also known as B-516

Where: Calvert County, Maryland (38.4° N, 76.6° W: paleocoordinates 38.6° N, 73.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• STRATIGRAPHIC RELATIONS: From Drumcliff Mbr of the Choptank Fm, Chesapeake Grp. AGE: Middle Miocene. STRATIGRAPHIC POSITION: From unit 1.

• bed-level stratigraphic resolution

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

• ENVIRONMENT: Shallow marine siliciclastic.
• SPECIFIC LITHOLOGY: Fine-very fine sand, shelly. 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 Unpublished PhD thesis, Yale University 1-511 [A. Hendy/A. Hendy/A. Hendy]more details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 79352: authorized by Austin Hendy, entered by Austin Hendy on 03.03.2008

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.
Chondrichthyes
 Myliobatiformes - Myliobatidae
Myliobatis sp. Cuvier 1816 eagle ray
Lingulata
 Discinida - Disciniidae
Discinisca lugubris Conrad 1834
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Gymnolaemata
 Cheilostomata - Membraniporidae
"Membranipora" sp. Blainville 1834
Gastropoda
 Cerithioidea - Turritellidae
Turritella sp. Lamarck 1799 turret shell
 Neogastropoda - Muricidae
Ecphora sp. Conrad 1843 murex snail
 Epitonioidea - Epitoniidae
""Scala" sayana" = Epitonium humphreysii
""Scala" sayana" = Epitonium humphreysii Kiener 1838 wentletrap
 Trochoidea - Trochidae
Calliostoma aphelium Dall 1892 top snail
Bivalvia
 Nuculanida - Nuculanidae
Nuculana liciata Conrad 1843 pointed nut clam
 Nuculida - Nuculidae
Nucula taphria Dall 1898 nut clam
 Carditida - Astartidae
Astarte ? thisphila Glenn 1904 clam
 Cardiida - Lasaeidae
Aligena aequata Conrad 1843 aligena
 Cardiida - Glossidae
Glossus sp. Poli 1795 clam
 Cardiida - Mactridae
Spisula subparilis Conrad 1841 clam
 Cardiida - Veneridae
Dosinia acetabulum Conrad 1832 venus clam
Mercenaria sp. Schumacher 1817 quahog
 Cardiida - Semelidae
Semele subovata Say 1824 clam
 Cardiida - Cardiidae
"Cerastoderma laqueatum" = Chesacardium laqueatum
"Cerastoderma laqueatum" = Chesacardium laqueatum Conrad 1830 cockle
 Pholadida - Corbulidae
"Caryocorbula inaequalis" = Corbula inaequalis
"Caryocorbula inaequalis" = Corbula inaequalis Say 1824 clam
 Hiatellida - Hiatellidae
Hiatella arctica Linnaeus 1767 clam
 Lucinida - Lucinidae
"Parvilucina crenulatus" = Parvilucina crenulata
"Parvilucina crenulatus" = Parvilucina crenulata Conrad 1840 clam
 Mytilida - Mytilidae
Modiolus sp. Lamarck 1801 mussel
Modiolus dalli Glenn 1904 mussel
 Pectinida - Pectinoidae
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens Ward and Blackwlder 1975 scallop
Scaphopoda
 Gadilida - Gadilidae
Cadulus newtonensis Meyer and Aldrich 1886 tusk shell
Malacostraca
 Decapoda -
Decapoda indet. Latreille 1802 decapod
Thecostraca
 Balanomorpha - Balanidae
"Balanus concavus" = Concavus concavus
"Balanus concavus" = Concavus concavus Bronn 1831 barnacle