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

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)

• group of beds-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
• brownish sandy clay

Size class: macrofossils

Preservation: original phosphate

Reposited in the USNM

Collection methods: surface (in situ),

Primary reference: A. R. Barwick. 1939. Miocene porpoise (Delphinodon dividum) from southern Maryland. American Midland Natualist 22:154-159 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45506: authorized by Mark Uhen, entered by Mark Uhen on 26.10.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Odontaspidida - Isuridae
Oxyrhina sp.5 Agassiz 1843 mackerel shark
 Lamniformes - Cetorhinidae
Cetorhinus sp.1 de Blainville 1816 basking shark
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon5
"Carcharodon megalodon" = Otodus megalodon5 Agassiz 1843 megalodon
Also studied in Pimiento and Balk
Reptilia
 Testudines -
"Chelonia indet." = Testudines5
"Chelonia indet." = Testudines5 Batsch 1788 turtle
Mammalia
 Sirenia - Dugongidae
"Metaxytherium calvertense" = Metaxytherium crataegense5
"Metaxytherium calvertense" = Metaxytherium crataegense5 Simpson 1932 dugong
 Carnivora - Phocidae
Leptophoca sp.5, "Leptophoca lenis" = Leptophoca proxima5
Leptophoca sp.5 True 1906 seal
"Leptophoca lenis" = Leptophoca proxima5 Van Beneden 1876 seal
 Cetacea -
 Odontoceti - Physeteridae
Orycterocetus crocodilinus2 Cope 1867 sperm whale
base of Zone 12
 Delphinoidea - Delphinidae
Delphinidae indet.5 Gray 1821 dolphin
 Odontoceti - Kentriodontidae
Delphinodon dividum True 1912 toothed whale
Zone 12
 Odontoceti -
Priscodelphinus atropius5 Cope 1868 toothed whale
 Odontoceti - Eurhinodelphinidae
Schizodelphis barnesi3, "Eurhinodelphis whitmorei n. sp." = Xiphiacetus cristatus4, "Eurhinodelphis vaughni n. sp." = Xiphiacetus bossi4, Eurhinodelphis sp.5
Schizodelphis barnesi3 Myrick 1979 toothed whale
"Eurhinodelphis whitmorei n. sp." = Xiphiacetus cristatus4 Du Bus 1872 toothed whale
"Eurhinodelphis vaughni n. sp." = Xiphiacetus bossi4 Kellogg 1925 toothed whale
Eurhinodelphis sp.5 Van Beneden and Gervais 1880 toothed whale