Parker Creek, north, Zone 12 (Miocene of the United States)

Also known as south of Dares Wharf

Where: Calvert County, Maryland (38.5° N, 76.5° W: paleocoordinates 38.7° N, 73.2° W)

• coordinate estimated from map

When: Plum Point Member (Calvert Formation), Langhian (16.0 - 13.8 Ma)

• bed-level stratigraphic resolution

Environment/lithology: estuary or bay; brown, sandy claystone

• sparse molluscs, low in diversity; subtropical environment in embayment and dry onshore; area not far from shore, bay, short-term eustatic transgression events, long-term regression trend
• brownish sandy clay

Size class: macrofossils

Preservation: original phosphate

Reposited in the USNM

Collection methods: surface (in situ),

Primary reference: G. B. Shattuck. 1904. Geological and paleontological relations, with a review of earlier investigations. Maryland Geological Survey Miocene Text xxxiii-clv [M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 70823: authorized by Mark Uhen, entered by Mark Uhen on 09.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Cardiida - Veneridae
"Cytherea staminea" = Melosia staminea, "Venus mercenaria" = Mercenaria mercenaria
"Cytherea staminea" = Melosia staminea Conrad 1838 venus clam
"Venus mercenaria" = Mercenaria mercenaria Linnaeus 1758 quahog
Gastropoda
 Neogastropoda - Muricidae
Ecphora quadricostata Conrad 1830 murex snail
var. umbilicata
Chondrichthyes
 Odontaspidida - Alopiidae
Alopias palatasi n. sp.2 Kent 2018 thresher shark
 Carchariniformes - Hemigaleidae
Hemipristis serra4 Agassiz 1843 ground shark
Aves
 Charadriiformes - Panalcidae
Miocepphus mcclungi5 Wetmore 1940 auk
Mammalia
 Carnivora - Phocidae
? Leptophoca sp.4, "Leptophoca cf. proxima" = Leptophoca proxima1, "Leptophoca lenis" = Leptophoca proxima3
? Leptophoca sp.4 True 1906 seal
"Leptophoca cf. proxima" = Leptophoca proxima1 Van Beneden 1876 seal
"Leptophoca lenis" = Leptophoca proxima3 Van Beneden 1876 seal
 Mysticeti -
Parietobalaena palmeri4 Kellogg 1924 whale
 Odontoceti - Platanistidae
"Schizodelphis crassangulum" = Zarhachis crassangulum4
"Schizodelphis crassangulum" = Zarhachis crassangulum4 Case 1904 toothed whale
 Odontoceti - Eurhinodelphinidae
Eurhinodelphis sp.4 Van Beneden and Gervais 1880 toothed whale