Patuxent River, near: Serravallian, Maryland

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Cetacea
Cetacea indet. Brisson 1762
1 specimen
whale vertebra
Priscodelphinus ruschenbergeri (Cope 1868)
Shattuck 1904
nomen dubium belonging to Odontoceti
Priscodelphinus gabbii (Cope 1868)
Shattuck 1904
nomen dubium belonging to Odontoceti
Priscodelphinus lacertosus (Cope 1868)
Shattuck 1904
nomen dubium belonging to Odontoceti
Ixacanthus spinosus (Cope 1868)
Shattuck 1904
nomen dubium belonging to Odontoceti
Ixacanthus conradi (Leidy 1852)
Shattuck 1904
nomen dubium belonging to Odontoceti
Ixacanthus atropius (Cope 1868)
Shattuck 1904
nomen dubium belonging to Odontoceti
Ixacanthus stenus (Cope 1868)
Shattuck 1904
nomen dubium belonging to Odontoceti
Ixacanthus coelospondylus Cope 1868
Shattuck 1904
nomen dubium belonging to Odontoceti
Cetophis heteroclitus Cope 1868
Shattuck 1904
nomen dubium belonging to Odontoceti
Rhabdosteus latiradix Cope 1867
Myrick 1979
nomen dubium belonging to Odontoceti
Mammalia - Cetacea - Platanistidae
Zarhachis flagellator Cope 1868
Shattuck 1904
Mammalia - Cetacea - Squalodontidae
Squalodon atlanticus (Leidy 1856)
Shattuck 1904
invalid subgroup of Squalodontidae
Mammalia - Cetacea
Delphinodon leidyi Hay 1902
Shattuck 1904
invalid subgroup of Odontoceti
Mammalia - Tayassuidae
Squalodon protervus (Cope 1867)
Shattuck 1904
nomen dubium belonging to Cynorca
Reptilia - Testudines - Trionychidae
Case 1904
    = Trionychidae indet. Gray 1825
Alroy 2006
Reptilia - Testudines - Cheloniidae
Chelone sp. Linnaeus 1758
Case 1904
Reptilia - Testudines
Trionyx cellulosus Cope 1868
Case 1904
nomen dubium belonging to Pantrionychidae
Reptilia
Thecachampsa sicaria n. sp. Cope 1869
Weems 2018
synonym of Thecachampsa sericodon
AMNH FARB 1321 - type
Actinopteri - Scombriformes
Sphyraena speciosa Leidy 1856
Shattuck 1904
recombined as Sphyraenodus speciosus
Chondrichthyes - Carcharhiniformes - Galeocerdidae
Galeocerdo aduncus (Agassiz 1835)
Shattuck 1904
Galeocerdo latidens (Agassiz 1835)
Shattuck 1904
Chondrichthyes - Carcharhiniformes - Sphyrnidae
Carcharias magna (Cope 1868)
Shattuck 1904
original and current combination Sphyrna magna
Sphyrna magna Cope 1868
Leriche 1942
Carcharias laevissimus (Cope 1867)
Shattuck 1904
recombined as Sphyrna laevissima
Chondrichthyes - Carcharhiniformes - Hemigaleidae
Hemipristis serra Agassiz 1835
Shattuck 1904
Chondrichthyes - Carcharhiniformes - Carcharhinidae
Carcharias (Prionodon) egertoni (Agassiz 1843)
Shattuck 1904
recombined as Prionodon egertoni
Galeocerdo contortus Gibbes 1847
Shattuck 1904
recombined as Physogaleus contortus
Galeocerdo triqueter Eastman 1904
Shattuck 1904
recombined as Physodon triqueter
Chondrichthyes - Lamniformes - Odontaspididae
Odontaspis cuspidata (Agassiz 1843)
Shattuck 1904
recombined as Araloselachus cuspidatus
Chondrichthyes - Lamniformes - Carchariidae
Carcharias collata Eastman 1904
Shattuck 1904
Chondrichthyes - Lamniformes - Otodontidae
Otodus obliquus Agassiz 1838
Shattuck 1904
Carcharodon megalodon (Agassiz 1835)
Shattuck 1904
recombined as Otodus megalodon
Chondrichthyes - Lamniformes - Lamnidae
Oxyrhina desorii Agassiz 1843
Shattuck 1904
synonym of Isurus oxyrinchus
Oxyrhina hastalis Agassiz 1838
Shattuck 1904
recombined as Carcharodon hastalis
Chondrichthyes - Squalomorphii - Hexanchidae
Notidanus primigenius Agassiz 1835
Eastman 1904
recombined as Notorhynchus primigenius
Chondrichthyes - Heterodontiformes - Heterodontidae
Sphyrna prisca Agassiz 1843
Shattuck 1904
recombined as Cestracion prisca
Chondrichthyes - Myliobatiformes - Dasyatidae
Raja dux Cope 1867
Eastman 1904
recombined as Trygon dux
Chondrichthyes - Myliobatiformes - Myliobatidae
Myliobatis frangens n. sp. Eastman 1904
Eastman 1904
Myliobatis gigas Cope 1868
Eastman 1904
Myliobatis pachyodon Cope 1868
Eastman 1904
Chondrichthyes - Myliobatiformes - Aetobatidae
Aetobatis arcuatus Agassiz 1843
Shattuck 1904
synonym of Aetobatus irregularis
Bivalvia - Pectinida - Pectinidae
Pecten (Pseudamusium) cerinus (Conrad 1869)
Shattuck 1904
recombined as Eburneopecten cerinus
Gastropoda - Ranellidae
Tritonium centrosum (Cope 1867)
Shattuck 1904
see common names

Geography
Country:United States State/province:Maryland County:Charles
Coordinates: 38.5° North, 76.7° West (view map)
Paleocoordinates:38.7° North, 73.8° West
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period:Neogene Epoch:Miocene
Stage:Serravallian 10 m.y. bin:Cenozoic 5
Key time interval:Serravallian
Age range of interval:13.82000 - 11.63000 m.y. ago
Stratigraphy
Geological group:Chesapeake Formation:Calvert Member:Calvert Beach
Regional section:Shattuck Regional bed:12
Regional order:bottom to top
Stratigraphy comments: early late Barstovian; 14.9-14.8 Ma AEO date

Zones 14-16A are regarded as Serravallian in age.
Lithology and environment
Primary lithology: not reported
Environment:coastal indet.
Taphonomy
Modes of preservation:body,original phosphate
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Database number:57782
Authorizer:M. Uhen, J. Alroy Enterer:M. Uhen, J. Alroy
Modifier:G. Varnham Research group:vertebrate
Created:2006-01-02 11:57:28 Last modified:2022-03-03 05:30:11
Access level:the public Released:2006-01-02 11:57:28
Creative Commons license:CC BY
Reference information

Primary reference:
33100. 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]

Secondary references:

18120 J. Alroy. 2006. Synonymies and reidentifications of North American fossil vertebrates. [J. Alroy/J. Alroy/J. Alroy]
17218 E. C. Case. 1904. Systematic Paleontology: Reptilia. Maryland Geological Survey Miocene: Text 62-70 [M. Uhen/M. Uhen/M. Uhen]
14163 E. D. Cope. 1867. [Descriptions of Eschrichtius cephalus, Rhabdosteus latiradix, Squalodon atlanticus, and S. mento.]. Proceedings of the Academy of Natural Science of Philadelphia 1867:131-132 [M. Uhen/M. Uhen/M. Uhen]
14892 L. de Verteuil and G. Norris. 1996. Dinoflagellate cyst zonation and allostratigraphy of the Chesapeake Group. Micropaleontology 42:1-25 [M. Uhen/M. Uhen/M. Uhen]
17219 C. R. Eastman. 1904. Systematic Paleontology: Pisces. Maryland Geological Survey Miocene, Text 71-93 [M. Uhen/M. Uhen/M. Uhen]
28099 M. Leriche. 1942. Contribution a l'etude des faunes ichthyologiques marines des terrains tertiaires de la plaine cotiere Atlantique et du centre des Etats-Unis. Memoires de la Societe Geologique de France (Nouvelle Serie) 45:1-111 [M. Uhen/M. Uhen]
15550 A. C. Myrick. 1979. Variation, taphonomy, and adaptation of the Rhabdosteidae (=Eurhinodelphidae) (Odontoceti, Mammalia) from the Calvert Formation of Maryland and Virginia. University of California, Los Angeles 1-411 [M. Uhen/M. Uhen]
23697 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]
23900 R. E. Weems. 2018. Crocodilians of the Calvert Cliffs. Smithsonian Contributions to Paleobiology 100:213-240 [J. Alroy/J. Alroy/M. Uhen]