Patuxent River, near (Miocene of the United States)

Where: Charles County, Maryland (38.5° N, 76.7° W: paleocoordinates 38.7° N, 73.4° W)

• coordinate estimated from map

• local area-level geographic resolution

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

• early late Barstovian; 14.9-14.8 Ma AEO date

Environment/lithology: coastal; lithology not reported

Size class: macrofossils

Preservation: original phosphate

Primary reference: S. L. Mitchill. 1818. Observations on the geology of North America. In G. Cuvier (ed.), Essay on the Theory of the Earth 319-424 [M. Uhen/M. Uhen/J. Alroy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 57782: authorized by Mark Uhen, entered by Mark Uhen on 02.01.2006, edited by John Alroy

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Pectinoidae
"Pecten (Pseudamusium) cerinus" = Eburneopecten cerinus7
"Pecten (Pseudamusium) cerinus" = Eburneopecten cerinus7 Conrad 1869 scallop
Gastropoda
 Tonnoidea - Ranellidae
Tritonium centrosum7 Cope 1867 triton
Chondrichthyes
 Odontaspidida - Carcharodontidae
"Oxyrhina hastalis" = Cosmopolitodus hastalis7
"Oxyrhina hastalis" = Cosmopolitodus hastalis7 Agassiz 1843 elasmobranch
 Plagiostomi -
"Raja dux" = Trygon dux4
"Raja dux" = Trygon dux4 Cope 1867 elasmobranch
 Myliobatiformes - Myliobatidae
Myliobatis frangens n. sp.4 Eastman 1904 eagle ray
Myliobatis gigas4 Cope 1868 eagle ray
Myliobatis pachyodon4 Cope 1868 eagle ray
"Aetobatis arcuatus" = Aetobatis irregularis7 Agassiz 1843 eagle ray
 Lamniformes - Carchariidae
"Galeocerdo triqueter" = Physodon triqueter7
"Galeocerdo triqueter" = Physodon triqueter7 Eastman 1904 mackerel shark
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon7, Otodus obliquus7
"Carcharodon megalodon" = Otodus megalodon7 Agassiz 1843 megalodon
Otodus obliquus7 Agassiz 1843 mackerel shark
 Lamniformes - Lamnidae
"Oxyrhina desorii" = Isurus oxyrinchus7, "Odontaspis cuspidata" = Lamna cuspidata7
"Oxyrhina desorii" = Isurus oxyrinchus7 Rafinesque 1810 mako shark
"Odontaspis cuspidata" = Lamna cuspidata7 Agassiz 1843 mackerel shark
 Lamniformes - Odontaspididae
Carcharias collata7 Eastman 1904 sand shark
 Carchariniformes - Carcharhinidae
Carcharias (Prionodon) egertoni7 Eastman 1904 blue shark
Galeocerdo contortus7 Gibbes 1848 tiger shark
Galeocerdo aduncus7 Agassiz 1843 tiger shark
Galeocerdo latidens7 Agassiz 1843 tiger shark
 Carchariniformes - Sphyrnidae
"Carcharias magna" = Sphyrna magna7, "Sphyrna magna" = Sphyrna magna5, "Carcharias laevissimus" = Sphyrna laevissima7, Sphyrna prisca7
"Carcharias magna" = Sphyrna magna7 Cope 1868 hammerhead shark
"Sphyrna magna" = Sphyrna magna5 Cope 1868 hammerhead shark
"Carcharias laevissimus" = Sphyrna laevissima7 Cope 1867 hammerhead shark
Sphyrna prisca7 Agassiz 1843 hammerhead shark
 Carchariniformes - Hemigaleidae
"Hemipristis serra" = Hemipristis heteropleurus7
"Hemipristis serra" = Hemipristis heteropleurus7 Agassiz 1844 ground shark
 Hexanchiformes - Hexanchidae
"Notidanus primigenius" = Notorhynchus primigenius4
"Notidanus primigenius" = Notorhynchus primigenius4 Agassiz 1843 sevengill shark
Actinopteri
 Acanthomorphata - Sphyraenidae
"Sphyraena speciosa" = Dictyodus speciosus7
"Sphyraena speciosa" = Dictyodus speciosus7 Leidy 1856 barracuda
Reptilia
 Testudines - Cheloniidae
Chelone sp.2 Linnaeus 1758 sea turtle
 Testudines - Trionychidae
Trionychidae indet.1 Gray 1825 softshell turtle
 Testudines - Pantrionychidae
Trionyx cellulosus2 Cope 1868 turtle
 Crocodylia -
"Thecachampsa sicaria n. sp." = Thecachampsa sericodon8
"Thecachampsa sicaria n. sp." = Thecachampsa sericodon8 Cope 1867 crocodilian
AMNH FARB 1321 - type
Mammalia
 Cetacea -
Cetacea indet., "Delphinodon leidyi" = Squalodon wymanii7, "Ixacanthus spinosus" = Priscodelphinus spinosus7
Cetacea indet. Brisson 1762 whale
whale vertebra
"Delphinodon leidyi" = Squalodon wymanii7 Cope 1867 toothed whale
"Ixacanthus spinosus" = Priscodelphinus spinosus7 Cope 1868 toothed whale
 Cetacea - Squalodontidae
Squalodon protervus7 Cope 1867 toothed whale
Squalodon atlanticus7 Leidy 1856 toothed whale
 Cetacea - Platanistidae
Zarhachis flagellator7 Cope 1868 toothed whale
 Cetacea -
"Priscodelphinus ruschenbergeri" = Tretosphys ruschenbergeri7, "Priscodelphinus lacertosus" = Tretosphys lacertosus7, "Priscodelphinus gabbii" = Delphinapterus gabbii7, "Squalodon mento n. sp." = Delphinodon mento3, "Ixacanthus conradi" = Priscodelphinus conradi7, "Ixacanthus stenus" = Priscodelphinus stenus7, "Ixacanthus atropius" = Priscodelphinus atropius7, Cetophis heteroclitus7, Rhabdosteus latiradix6, Ixacanthus coelospondylus7
"Priscodelphinus ruschenbergeri" = Tretosphys ruschenbergeri7 Cope 1868 toothed whale
"Priscodelphinus lacertosus" = Tretosphys lacertosus7 Cope 1868 toothed whale
"Priscodelphinus gabbii" = Delphinapterus gabbii7 Cope 1868 toothed whale
"Squalodon mento n. sp." = Delphinodon mento3 Cope 1867 toothed whale
It is not clear which locality Squalodon mento is actually from.
"Ixacanthus conradi" = Priscodelphinus conradi7 Leidy 1852 toothed whale
"Ixacanthus stenus" = Priscodelphinus stenus7 Cope 1868 toothed whale
"Ixacanthus atropius" = Priscodelphinus atropius7 Cope 1868 toothed whale
Cetophis heteroclitus7 Cope 1868 toothed whale
Rhabdosteus latiradix6 Cope 1867 toothed whale
Ixacanthus coelospondylus7 Cope 1868 toothed whale