78SK35 - Unit 3 (Miocene of the United States)

Also known as B-558

Where: Calvert County, Maryland (38.4° N, 76.4° W: paleocoordinates 38.6° N, 73.3° 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 3.

• bed-level stratigraphic resolution

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

• ENVIRONMENT: Shallow marine siliciclastic.
• SPECIFIC LITHOLOGY: Hashy, shell-supported fine-medium 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 Unpublished PhD thesis, Yale University 1-511 [A. Hendy/A. Hendy/A. Hendy]more details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 79113: 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.
Maxillopoda
 Sessilia - Balanidae
"Balanus concavus" = Concavus concavus
"Balanus concavus" = Concavus concavus Bronn 1831 barnacle
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
 Carditida - Astartidae
Astarte thisphila Glenn 1904 clam
 Carditida - Crassatellidae
Eucrassatella sp. Iredale 1924 clam
 Pholadida - Corbulidae
"Caryocorbula inaequalis" = Corbula inaequalis, Bicorbula idonea
"Caryocorbula inaequalis" = Corbula inaequalis Say 1824 clam
Bicorbula idonea Conrad 1833 clam
 Cardiida - Glossidae
Glossus sp. Poli 1795 clam
 Cardiida - Mactridae
Spisula subparilis Conrad 1841 clam
Spisula sp. Gray 1837 clam
 Cardiida - Veneridae
Veneridae indet. Rafinesque 1815 venus clam
Mercenaria sp. Schumacher 1817 quahog
Mercenaria ? plena Conrad 1869 quahog
Mercenaria campechiensis Gmelin 1791 quahog
[entered as Mercenaria campehiensis]
Dosinia acetabulum Conrad 1832 venus clam
Pitar ? subnasuta venus clam
? Petricola sp. Lamarck 1801 venus clam
or Gari sp.
 Cardiida - Tellinidae
"Macoma biplicata" = Florimetis biplicata
"Macoma biplicata" = Florimetis biplicata Conrad 1834 tellin clam
 Cardiida - Semelidae
Semele carinata Conrad 1830 clam
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
 Lucinida - Lucinidae
"Megaxinus anodonta" = Stewartia anodonta
"Megaxinus anodonta" = Stewartia anodonta Say 1824 clam
 Nuculida - Nuculidae
Nucula taphria Dall 1898 nut clam
Gastropoda
 Ptenoglossa - Epitoniidae
Scala sp. Humphrey wentletrap
 Neogastropoda - Buccinidae
Nassa sp. Röding 1798 true whelk
 Neogastropoda - Muricidae
Ecphora sp. Conrad 1843 murex snail
 Neogastropoda - Terebridae
Terebra sp. Bruguière 1789 auger snail
 Vanikoroidea - Eulimidae
Eulima sp. Risso 1826 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
 Vermetoidea - Vermetidae
"Vermetus graniferus" = Serpulorbis granifera
"Vermetus graniferus" = Serpulorbis granifera Say 1824 worm shell
 Calyptraeoidea - Calyptraeidae
Crucibulum multilineatum Conrad 1842 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
Scaphopoda
 Gadilida - Gadilidae
Cadulus newtonensis Meyer and Aldrich 1886 tusk shell
Echinoidea
 Clypeasteroida - Scutellidae
"Abertella aberti" = Scutella aberti
"Abertella aberti" = Scutella aberti Conrad 1842 sand dollar
Anthozoa
 Scleractinia - Oculinidae
Astrhelia plamata stony coral