Chesapeake Bay (Upper Calvert) (Miocene of the United States)

Also known as Cat Creek; Chesapeake Beach; Drum Cliff; Governor Run; Kenwood Beach; Long Beach; Plum Point; Randle Cliff; Scientist's Cliff

Where: Calvert County, Maryland (38.4° N, 76.5° W: paleocoordinates 38.6° N, 73.6° W)

• coordinate based on political unit

When: Plum Point Member (Calvert Formation), Serravallian (13.8 - 11.6 Ma)

Environment/lithology: transition zone or lower shoreface; sandy claystone

• Mollusk (especially Pycnodonte percrassa)-bearing blue-green (at the base) to greenish (in the middle) to brown (at the top) sandy clay.

•Subtropical, not far from shore

Size class: macrofossils

Primary reference: R. H. Tedford and M. E. Hunter. 1984. Miocene marine-nonmarine correlations, Atlantic and Gulf Coastal Plains, North America. Palaeography, Palaeoclimatology, Palaeoecology 47:129-151 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 18518: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Mark Uhen and Evangelos Vlachos

Creative Commons license: CC BY (attribution)

Taxonomic list

• beds 13 to 15; 15 is in the Choptank Fm. according to Tedford and Hunter but in the Calvert Fm. according to Wright and Eshelman 1987unless otherwise noted, provenance at this level is assumed by Tedford and HunterCat Creek and Drum Cliff are in St. Mary's Co.: Wright and Eshelman 1987
Chondrichthyes
 Squatiniformes - Squatinidae
Squatina occidentalis3 Eastman 1904 angel shark
 Odontaspidida - Carcharodontidae
"Oxyrhina hastalis" = Cosmopolitodus hastalis3
"Oxyrhina hastalis" = Cosmopolitodus hastalis3 Agassiz 1843 elasmobranch
 Myliobatiformes - Rhinopteridae
Rhinoptera sp.3 Cuvier 1829 cownose ray
 Lamniformes - Lamnidae
"Oxyrhina retroflexa" = Isurus retroflexus3, "Odontaspis cuspidata" = Lamna cuspidata3
"Oxyrhina retroflexa" = Isurus retroflexus3 Agassiz 1843 mako shark
"Odontaspis cuspidata" = Lamna cuspidata3 Agassiz 1843 mackerel shark
 Lamniformes - Odontaspididae
Odontaspis actutissima3 Agassiz 1843 sand tiger shark
 Carchariniformes - Carcharhinidae
Prionodon egertoni3 Agassiz 1843 blue shark
Galeocerdo aduncus3 Agassiz 1843 tiger shark
 Carchariniformes - Sphyrnidae
Sphyrna laevissima3 Cope 1867 hammerhead shark
Sphyrna prisca3 Agassiz 1843 hammerhead shark
var. eastmani, n. var.
 Carchariniformes - Hemigaleidae
"Hemipristis serra" = Hemipristis heteropleurus3
"Hemipristis serra" = Hemipristis heteropleurus3 Agassiz 1844 ground shark
 Hexanchiformes - Hexanchidae
"Notidanus primigenius" = Notorhynchus primigenius3
"Notidanus primigenius" = Notorhynchus primigenius3 Agassiz 1843 sevengill shark
Reptilia
 Testudines -
"Chelonia indet." = Testudines4
"Chelonia indet." = Testudines4 Batsch 1788 turtle
 Testudines - Pantestudinidae
Floridemys hurdi n. sp.6 Weems and George 2013 turtle
CMM 4666 (holotype), nuchal (Weems and George 2013, fig. 12)
Mammalia
 Perissodactyla - Rhinocerotidae
? Aphelops sp. Owen 1845 rhinoceros
beds 13 and 14
 Perissodactyla - Tapiridae
Tapiravus cf. validus Marsh 1871 tapir
 Perissodactyla - Equidae
Equinae indet.1 Steinmann and Döderlein 1890 horse
Archaeohippus sp. Gidley 1906 anchitheriine horse
provenance is questioned by Wright and Eshelman 1987 on biochronological grounds, but their argument seems poor in light of the Norden Bridge fauna
 Carnivora - Amphicyonidae
Amphicyonidae indet.1 Haeckel 1886 bear-dog
 Proboscidea - Mammutidae
Gomphotherium obscurum1 Leidy 1869 mastodon
 Ungulata - Tayassuidae
Prosthennops niobrarensis Colbert 1935 peccary
Governor's Run Road, ? bed 15
Prosthennops xiphodonticus Barbour 1925 peccary
Kenwood Beach, ? bed 14; Scientist's Cliff, bed 14
 Ungulata - Camelidae
? Aepycamelus sp. Macdonald 1956 camel
 Ungulata - Protoceratidae
Protoceratidae indet.5 Marsh 1891 protoceratid
 Cetacea - Physeteridae
Orycterocetus crocodilinus2 Cope 1867 sperm whale
Aetobatus
  - Aetobatidae
"Aetobatis arcuatus" = Aetobatis irregularis3
"Aetobatis arcuatus" = Aetobatis irregularis3 Agassiz 1843