78SK57 - Unit 3 (base) (Miocene of the United States)

Also known as B-544

Where: Calvert County, Maryland (38.4° N, 76.5° W: paleocoordinates 38.6° N, 73.4° 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 base of unit 3.

• 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 Unpublished PhD thesis, Yale University 1-511 [A. Hendy/A. Hendy/A. Hendy]more details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 79107: 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
"Balanus concavus" = Concavus concavus
"Balanus concavus" = Concavus concavus Bronn 1831 barnacle
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
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens Ward and Blackwlder 1975 scallop
 Ostreida - Malleidae
Isognomon maxillata Lamarck 1819 oyster
 Mytilida - Mytilidae
Mytilus sp. Linnaeus 1758 mussel
Modiolus sp. Lamarck 1801 mussel
 Carditida - Astartidae
Astarte thisphila Glenn 1904 clam
 Carditida - Crassatellidae
"Eucrassatella turgidulus" = Marvacrassatella turgidula
"Eucrassatella turgidulus" = Marvacrassatella turgidula Conrad 1843 clam
 Pholadida -
? Myoidea indet. Lamarck 1809 clam
 Pholadida - Corbulidae
"Caryocorbula inaequalis" = Corbula inaequalis Say 1824 clam
Bicorbula idonea Conrad 1833 clam
 Cardiida - Mactridae
Spisula subparilis Conrad 1841 clam
? Spisula sp. Gray 1837 clam
 Cardiida - Veneridae
Mercenaria sp. Schumacher 1817 quahog
Dosinia acetabulum Conrad 1832 venus clam
? Pitar subnasuta venus clam
? Pitar sp. Römer 1857 venus clam
? Clementia sp. Gray 1847 venus clam
 Cardiida - Tellinidae
Tellinidae indet. Blainville 1814 tellin clam
 Cardiida - Psammobiidae
 Cardiida - Semelidae
Semele subovata Say 1824 clam
 Cardiida - Cardiidae
"Cerastoderma laqueatum" = Chesacardium laqueatum
"Cerastoderma laqueatum" = Chesacardium laqueatum Conrad 1830 cockle
 Hiatellida - Hiatellidae
"Hiatella arctica" = Hiatella (Hiatella) arctica Linnaeus 1767 clam
Panopea sp. Menard 1807 clam
 Solenida - Pharidae
Ensis sp. Schumacher 1817 clam
 Lucinida - Lucinidae
"Megaxinus anodonta" = Stewartia anodonta
"Megaxinus anodonta" = Stewartia anodonta Say 1824 clam
 Nuculida - Nuculidae
Nucula ? taphria Dall 1898 nut clam
 Protobranchia - Nuculanidae
Nuculana liciata Conrad 1843 pointed nut clam
Gastropoda
 Ptenoglossa - Epitoniidae
""Scala" ? sayana" = Epitonium humphreysii
""Scala" ? sayana" = Epitonium humphreysii Kiener 1838 wentletrap
 Neogastropoda - Muricidae
Ecphora sp. Conrad 1843 murex snail
 Naticoidea - Naticidae
"Lunatia heros" = Euspira heros
"Lunatia heros" = Euspira heros Say 1822 moon snail
 Calyptraeoidea - Calyptraeidae
"Crucibulum ? constrictum" = Crucibulum (Dispotaea) constrictum Conrad 1842 slipper shell
Crucibulum multilineatum Conrad 1842 slipper shell
 Sorbeoconcha - Turritellidae
Turritella plebeius, "Turritella plebeia" = Mariacolpus plebeia
Turritella plebeius turret shell
"Turritella plebeia" = Mariacolpus plebeia Say 1824 turret shell
 Trochoidea - Trochidae
Calliostoma philanthropus Conrad 1834 top snail
Lingulata
 Lingulida - Disciniidae
Discinisca lugubris Conrad 1834