79SK107 - Unit 2: Serravallian, Maryland
collected by Kidwell 1979

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Polychaeta - Spionida - Spionidae
Polydora sp. Bosk 1801
Gastropoda - Neotaenioglossa - Calyptraeidae
Crucibulum multilineatum (Conrad 1842)
89 individuals
Gastropoda - Turritellidae
Turritella variabilis Conrad 1830
3 individuals
recombined as Turritella (Torcula) variabilis
Gastropoda - Neogastropoda - Muricidae
Ecphora sp. Conrad 1843
Bivalvia - Pholadida - Corbulidae
Caryocorbula inaequalis (Say 1824)
1 individual
original and current combination Corbula inaequalis
Bivalvia - Cardiida - Veneridae
? Pitar sp. Römer 1857
2 individuals
Dosinia acetabulum (Conrad 1832)
1 individual
Bivalvia - Carditida - Carditidae
Carditamera protracta Conrad 1843
19 individuals
recombined as Cardita protracta
Bivalvia - Carditida - Astartidae
Astarte obruta Conrad 1834
1 individual
Bivalvia - Pectinida - Pectinidae
Chesapecten nefrens Ward and Blackwlder 1975
15 individuals
recombined as Chesapecten (Chesapecten) nefrens
Bivalvia - Pectinida - Anomiidae
Anomia simplex d'Orbigny 1845
1 individual
Bivalvia - Ostreida - Malleidae
Isognomon maxillata (Lamarck 1819)
2 individuals
Bivalvia - Ostreida - Ostreidae
Ostrea carolinensis Conrad 1832
34 individuals
Bivalvia - Arcida - Arcidae
Anadara staminea (Say 1832)
1 individual
recombined as Dallarca staminea
unclassified
Bryozoa indet. Ehrenberg 1831
3 specimens
Demospongiae - Clavulina - Clionaidae
Entobia sp. Bronn 1838
see common names

Geography
Country:United States State/province:Maryland County:Calvert
Coordinates: 38.6° North, 76.1° West (view map)
Paleocoordinates:38.8° North, 73.2° 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 - 11.63000 m.y. ago
Stratigraphy
Geological group:Chesapeake Formation:Choptank Member:Boston Cliffs
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Boston Cliffs Mbr of the Choptank Fm, Chesapeake Grp. AGE: Middle Miocene. STRATIGRAPHIC POSITION: From unit 2.
Lithology and environment
Primary lithology:very fine,fine,shelly/skeletal unlithified sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Fine to very-fine silty 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:1979
Collection method comments: COLLECTOR: S.K. Kidwell, 1979. 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-573
Database number:79116
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:G. Varnham Research group:marine invertebrate
Created:2008-02-25 20:07:30 Last modified:2022-03-07 09:00:35
Access level:the public Released:2008-02-25 20:07:30
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]