78SK57 - Unit 4 (upper half): Serravallian, Maryland
collected by Kidwell 1978

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Demospongiae - Clavulina - Clionaidae
Entobia sp. Bronn 1838
Gastropoda
Gastropoda indet. Cuvier 1795
Gastropoda - Trochidae
Calliostoma alphelium
3 individuals
Calliostoma philanthropus (Conrad 1834)
Gastropoda - Lepetellida - Fissurellidae
Diodora nassula
1 individual
Gastropoda - Epitoniidae
Scala ? sayana Dall 1889
1 individual
synonym of Epitonium humphreysii
Gastropoda - Neotaenioglossa - Calyptraeidae
Crucibulum ? constrictum (Conrad 1842)
2 individuals
recombined as Crucibulum (Dispotaea) constrictum
Crucibulum multilineatum (Conrad 1842)
5 individuals
Gastropoda - Turritellidae
Turritella plebeia Say 1824
2 individuals
recombined as Mariacolpus plebeia
Gastropoda - Neogastropoda - Melongenidae
Busycon sp. Röding 1798
1 individual
Gastropoda - Neogastropoda - Terebridae
Terebra sp. Bruguière 1789
Gastropoda - Neogastropoda - Muricidae
Ecphora sp. Conrad 1843
Gastropoda - Naticidae
Lunatia heros (Say 1822)
7 individuals
recombined as Euspira heros
Bivalvia - Arcida - Arcidae
Anadara staminea (Say 1832)
21 individuals
recombined as Dallarca staminea
Bivalvia - Pectinida - Pectinidae
Chesapecten nefrens Ward and Blackwlder 1975
4 individuals
recombined as Chesapecten (Chesapecten) nefrens
Bivalvia - Mytilida - Mytilidae
Mytilus sp. Linnaeus 1758
2 individuals
Modiolus ducatellii (Conrad 1840)
3 individuals
Bivalvia - Lucinida - Lucinidae
Parvilucina crenulatus (Conrad 1840)
2 individuals
recombined as Parvilucina crenulata
Bivalvia - Pholadida - Corbulidae
Caryocorbula ? cuneata (Say 1824)
1 individual
Caryocorbula inaequalis (Say 1824)
8 individuals
original and current combination Corbula inaequalis
Bicorbula idonea (Conrad 1833)
21 individuals
Bivalvia - Cardiida - Lasaeidae
Aligena aequata (Conrad 1843)
2 individuals
Bivalvia - Cardiida - Glossidae
? Glossus sp. Poli 1795
3 individuals
Bivalvia - Cardiida - Veneridae
Veneridae indet. Rafinesque 1815
1 individual
Callista marylandica
1 individual
? Pitar subnasuta
35 individuals
Dosinia acetabulum (Conrad 1832)
17 individuals
Mercenaria sp. Schumacher 1817
1 individual
Bivalvia - Cardiida - Mactridae
Spisula subparilis (Conrad 1841)
15 individuals
Spisula ? delumbis (Conrad 1832)
1 individual
recombined as Leptomactra delumbis
? Spisula sp. Gray 1837
1 individual
Bivalvia - Cardiida - Cardiidae
Cerastoderma laqueatum (Conrad 1830)
41 individuals
recombined as Chesacardium laqueatum
Bivalvia - Cardiida - Psammobiidae
Gari gubernatoria
2 individuals
Bivalvia - Cardiida - Semelidae
Semele subovata (Say 1824)
2 individuals
? Semele carinata (Conrad 1830)
1 individual
Bivalvia - Carditida - Astartidae
Astarte sp. Sowerby 1816
1 individual
Astarte thisphila Glenn 1904
5 individuals
Bivalvia - Carditida - Carditidae
Cyclocardia granulata (Say 1824)
1 individual
Bivalvia - Carditida - Crassatellidae
Eucrassatella turgidulus (Conrad 1843)
3 individuals
recombined as Marvacrassatella turgidula
Scaphopoda - Gadilida - Gadilidae
Cadulus newtonensis Meyer and Aldrich 1886
2 individuals
Lingulata - Discinida - Disciniidae
Discinisca lugubris (Conrad 1834)
2 individuals
Malacostraca - Decapoda
Decapoda indet. Latreille 1802
2 specimens
Thecostraca - Balanomorpha - Balanidae
Balanus concavus Bronn 1831
310 specimens
recombined as Concavus concavus
see common names

Geography
Country:United States State/province:Maryland County:Calvert
Coordinates: 38.4° North, 76.5° West (view map)
Paleocoordinates:38.6° North, 73.6° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
Stage:Serravallian 10 m.y. bin:Cenozoic 5
Key time interval:Serravallian
Age range of interval:13.82000 - 11.62000 m.y. ago
Stratigraphy
Geological group:Chesapeake Formation:Choptank Member:Drumcliff
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Drumcliff Mbr of the Choptank Fm, Chesapeake Grp. AGE: Middle Miocene. STRATIGRAPHIC POSITION: From upper half of unit 4.
Lithology and environment
Primary lithology:fine,medium,shelly/skeletal unlithified sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Hashy, shell-supported fine-medium sand. LITHIFICATION: Unlithified, based on visual inspection of collection by enterer.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Shallow marine siliciclastic.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:bulk,sieve,field collection
Minimum sieve size:1.000
Reason for describing collection:taphonomic analysis
Museum repositories:YPM
Collectors:Kidwell Collection dates:1978
Collection method comments: COLLECTOR: S.K. Kidwell, 1978. REPOSITORY: Peabody Museum of Natural History, Yale University.
Taxonomic list comments: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.
Metadata
Also known as:B-547
Database number:79110
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:G. Varnham Research group:marine invertebrate
Created:2008-02-25 19:41:05 Last modified:2022-03-07 09:14:58
Access level:the public Released:2008-02-25 19:41:05
Creative Commons license:CC BY
Reference information

Primary reference:

26560. 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]