Chesapeake Beach, south of, Zones 3-6 (Miocene of the United States)

Where: Calvert County, Maryland (38.7° N, 76.5° W: paleocoordinates 38.9° N, 72.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Calvert Formation (Chesapeake Group), Burdigalian (20.4 - 16.0 Ma)

• from Shattuck's zones 3 to 5, zone 6 added from Kellogg 1923

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; diatomaceous, green, sandy siltstone

• Biologically active, open marine environment
• no lithological description given

Size class: macrofossils

Preservation: original phosphate

Reposited in the USNM

Collection methods: surface (in situ),

Primary reference: F. W. True. 1912. Description of a new fossil porpoise of the genus Delphinodon from the Miocene formation of Maryland. Journal of the Academy of Natural Sciences of Philadelphia 2:165-194 [M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45493: authorized by Mark Uhen, entered by Mark Uhen on 25.10.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Ostreida - Gryphaeidae
"Ostrea percrassa" = Pycnodonte percrassa7
"Ostrea percrassa" = Pycnodonte percrassa7 Conrad 1840 oyster
 Thraciida - Thraciidae
"Thracia conradi" = Thracia (Homoeodesma) conradi7
"Thracia conradi" = Thracia (Homoeodesma) conradi7 Couthouy 1839 clam
 Pholadida - Corbulidae
"Corbula elevata" = Varicorbula elevata7
"Corbula elevata" = Varicorbula elevata7 Conrad 1838 clam
Mammalia
 Perissodactyla - Tapiridae
Tapiravus cf. validus1 Marsh 1871 tapir
 Perissodactyla - Equidae
Merychippus sp.1 Leidy 1856 horse
 Cetacea -
Pelodelphis gracilis6 Kellogg 1955 toothed whale
 Cetacea - Platanistidae
Zarhachis flagellator3 Cope 1868 toothed whale
 Cetacea - Squalodontidae
Squalodon calvertensis n. sp.2 Kellogg 1923 toothed whale
 Cetacea - Eurhinodelphinidae
"Eurhinodelphis bossi n. sp." = Xiphiacetus bossi4
"Eurhinodelphis bossi n. sp." = Xiphiacetus bossi4 Kellogg 1925 toothed whale
 Cetacea -
"Delphinodon dividum n. sp." = Brevirostrodelphis dividum
"Delphinodon dividum n. sp." = Brevirostrodelphis dividum True 1912 toothed whale
[entered as Delphinodon dividium]
 Cetacea - Kentriodontidae
Kentriodon pernix n. gen. n. sp.5
Kentriodon pernix n. gen. n. sp.5 Kellogg 1927 toothed whale
 Cetacea -
Tretosphys gabbii6 Cope 1868 toothed whale
[entered as Tretosphys gabbi]