James T. Thomas estate: Serravallian, Maryland

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Pliorhytis centenaria
Sphaerula subvexa
Zizyphinus bryanii n. sp.
Cleistophaeridium placacanthum
Weems and Edwards 2007
Reptilia - Procellariidae
Puffinus sp. Brisson 1760
Wetmore 1926 1 specimen
Puffinus conradi n. sp. Marsh 1870
Marsh 1870 2 specimens
Reptilia
Thecachampsa sericodon n. sp. Cope 1867
ANSP 9443-9445 - type
Thecachampsa contusor n. sp. Cope 1867
synonym of Crocodilus antiquus
ANSP 9152 - type
Reptilia - Testudines
Trionyx cellulosus Cope 1868
nomen dubium belonging to Pantrionychidae
Reptilia - Testudines - Cheloniidae
Chelone sp. Linnaeus 1758
Mammalia - Cetacea
Rhabdosteus latiradix n. gen., n. sp. Cope 1867
Cope 1867
nomen dubium belonging to Odontoceti
Squalodon mento n. sp. Cope 1867
Cope 1867 1 specimen
invalid subgroup of Odontoceti
It is not clear which locality Squalodon mento is actually from.
Ixacanthus coelospondylus n. gen., n. sp. Cope 1868
Cope 1868 1 specimen
nomen dubium belonging to Odontoceti
Squalodon wymanii n. sp. Cope 1867
invalid subgroup of Odontoceti
it is not clear which locality Squalodon wymanii is from. Only described as Miocene of Charles County, MD.
Mammalia - Cetacea - Platanistidae
Zarhachis flagellator n. gen., n. sp. Cope 1868
Cope 1868 1 specimen
Mammalia - Cetacea
Delphinapterus gabbii n. sp. Cope 1868
Cope 1868
nomen dubium belonging to Odontoceti
Delphinapterus lacertosus n. sp. Cope 1868
Cope 1868
nomen dubium belonging to Odontoceti
Delphinapterus hawkinsii n. sp. Cope 1868
Cope 1868
nomen dubium belonging to Odontoceti
Delphinapterus ruschenbergeri n. sp. Cope 1868
Cope 1868
nomen dubium belonging to Odontoceti
Priscodelphinus stenus n. sp. Cope 1868
Cope 1868
nomen dubium belonging to Odontoceti
Priscodelphinus atropius n. sp. Cope 1868
Cope 1868 11 specimens
nomen dubium belonging to Odontoceti
Priscodelphinus acutidens n. sp. Cope 1867
1 specimen
nomen dubium belonging to Odontoceti
Priscodelphinus spinosus n. sp. Cope 1868
Cope 1868
nomen dubium belonging to Odontoceti
Cetophis heteroclitus n. gen., n. sp. Cope 1868
Cope 1868
nomen dubium belonging to Odontoceti
Mammalia - Cetacea - Physeteridae
Orycterocetus crocodilinus Cope 1867
Mammalia - Cetacea - Cetotheriidae
Delphinapterus tyrannus n. sp. Cope 1868
Cope 1868
synonym of Cetotherium parvum
Mammalia - Cetacea - Balaenopteridae
Eschrichtius cephalus n. sp. Cope 1867
(1 measurement)
    = ? Balaenoptera cephalus Cope 1867
Weems and Edwards 2007
Mammalia - Cetacea
Balaenoptera pusilla n. sp. Cope 1868
Cope 1868
nomen vanum belonging to Mysticeti
Megaptera expansa n. sp. Cope 1868
Cope 1868
nomen dubium belonging to Mysticeti
Actinopteri - Scombriformes
Sphyraena speciosa Leidy 1856
recombined as Sphyraenodus speciosus
Chondrichthyes - Myliobatiformes - Dasyatidae
Raja dux Cope 1867
recombined as Trygon dux
Chondrichthyes - Myliobatiformes - Aetobatidae
Aetobatis profundus n. sp. Cope 1867
Aetobatis arcuatus Agassiz 1843
Leriche 1942
synonym of Aetobatus irregularis
Aetobatus arcuatus (Agassiz 1843)
synonym of Aetobatus irregularis
[entered as Aetobatis arcuatus]
Chondrichthyes - Myliobatiformes - Myliobatidae
Myliobatis gigas Cope 1868
Myliobatis vicomicanus Cope 1868
Myliobatis pachyodon Cope 1868
Chondrichthyes - Carcharhiniformes - Galeocerdidae
Galeocerdo appendiculatus
Galeocerdo sp. Müller and Henle 1837
Galeocerdo aduncus (Agassiz 1835)
Galeocerdo egertoni (Agassiz 1843)
recombined as Prionodon egertoni
Galeocerdo latidens (Agassiz 1835)
Chondrichthyes - Carcharhiniformes - Sphyrnidae
Sphyrna sp. Rafinesque 1810
Galeocerdo laevissimus n. sp. Cope 1867
recombined as Sphyrna laevissima
Sphyrna magna Cope 1868
Chondrichthyes - Carcharhiniformes - Carcharhinidae
Galeocerdo contortus Gibbes 1847
recombined as Physogaleus contortus
Chondrichthyes - Carcharhiniformes - Hemigaleidae
Hemipristis serra Agassiz 1835
Chondrichthyes - Lamniformes - Odontaspididae
Lamna cuspidata Agassiz 1843
recombined as Araloselachus cuspidatus
Lamna denticulata Agassiz 1843
synonym of Araloselachus cuspidatus
Chondrichthyes - Lamniformes - Mitsukurinidae
Lamna elegans Agassiz 1838
synonym of Otodus macrotus
Lamna ? subulata (Agassiz 1843)
recombined as Eostriatolamia subulata
Chondrichthyes - Lamniformes - Otodontidae
Carcharodon ? angustidens (Agassiz 1835)
recombined as Otodus (Carcharocles) angustidens
Carcharodon megalodon (Agassiz 1835)
recombined as Otodus megalodon
Otodus obliquus Agassiz 1838
Otodus appendiculatus (Agassiz 1835)
recombined as Cretalamna appendiculata
Chondrichthyes - Lamniformes - Carchariidae
Lamna hopei (Agassiz 1843)
recombined as Carcharias hopei
Chondrichthyes - Squalomorphii - Hexanchidae
Notidanus plectrodon n. sp. Cope 1867
synonym of Notorynchus cepedianus
Notidanus primigeneus
Chondrichthyes - Heterodontiformes - Heterodontidae
Sphyrna prisca Agassiz 1843
recombined as Cestracion prisca
Craniata - Craniida - Craniidae
Orbicula lububris
replaced by Neocrania
Gastropoda - Lepetellida - Fissurellidae
Fissurella redimicula Say 1824
recombined as Diodora redimicula
Gastropoda - Turritellidae
Turritella alticostata Conrad 1834
recombined as Turritella (Turritella) alticostata
Turritella indenta Conrad 1841
Gastropoda - Epitoniidae
Scala pachypleura (Conrad 1841)
Gastropoda - Naticidae
Lunatia catenoides
Gastropoda - Neogastropoda - Muricidae
Ecphora quadricostata (Conrad 1830)
Gastropoda - Ranellidae
Bursa centrosa n. sp. Cope 1867
recombined as Tritonium centrosum
Bivalvia - Pectinida - Pectinidae
Pecten madisonius Say 1824
recombined as Chesapecten madisonius
Pecten jeffersonius Say 1824
recombined as Chesapecten jeffersonius
Pecten humphreysii Conrad 1842
Pecten cerinus n. sp. Conrad 1869
recombined as Eburneopecten cerinus
Pecten clintonius Say 1824
recombined as Placopecten clintonius
Pecten marylandicus Wagner 1839
recombined as Placopecten marylandica
Pecten virginianus Conrad 1840
recombined as Placopecten virginiana
Bivalvia - Pectinida - Anomiidae
Anomia multilineata
Bivalvia - Ostreida - Malleidae
Isognomon tortum
Bivalvia - Ostreida - Pinnidae
Pinna sp. Linnaeus 1758
Bivalvia - Ostreida - Ostreidae
Ostrea thomasii n. sp. Conrad 1867
    = Ostreidae indet. Rafinesque 1815
Bouchet et al. 2005
Ostera thomasii (syn. Cubitostrea sellaeformis) is from the Middle Eocene
Ostrea trachydiscus n. sp.
Bivalvia - Arcida - Noetiidae
Noetia carolinensis
Bivalvia - Arcida - Arcidae
Arca callipleura
Arca improcera
Bivalvia - Arcida - Glycymerididae
Glycimeris americanus
    = Glycymeris americana Defrance 1826
Hendy et al. 2008
Axinaea lentiformis
synonym of Glycymeris
Bivalvia - Cardiida - Cardiidae
Cardium laqueatum Conrad 1830
recombined as Chesacardium laqueatum
Bivalvia - Cardiida - Tellinidae
Metis biplicata (Conrad 1834)
recombined as Florimetis biplicata
Bivalvia - Cardiida - Glossidae
Isocardia fraterna Say 1824
recombined as Glossus fraterna
Isocardia markoii
Bivalvia - Cardiida - Chamidae
Chama corticosa
Bivalvia - Cardiida - Veneridae
Dosinia acetabulum (Conrad 1832)
Mercenaria staminea
Mercenaria cuneata n. sp. Conrad 1869
Dione staminaea
synonym of Hysteroconcha
Dione marylandica
synonym of Hysteroconcha
Bivalvia - Pholadida - Corbulidae
Corbula idonea Conrad 1833
recombined as Bicorbula idonea
Corbula pectorosa n. sp.
Bivalvia - Lucinida - Lucinidae
Lucina contracta Say 1824
recombined as Lucinoma contracta
Lucina americana Adams 1852
synonym of Divalinga quadrisulcata
Lucina foremani Conrad 1841
recombined as Stewartia foremani
Bivalvia - Carditida - Crassatellidae
Crassatella marylandica Conrad 1832
recombined as Marvacrassatella marylandica
Crassatella melina Conrad 1832
recombined as Marvacrassatella melina
Bivalvia - Carditida - Carditidae
Carditamera protracta Conrad 1843
recombined as Cardita protracta
Cyclocardia granulata (Say 1824)
Bivalvia - Carditida - Astartidae
Astarte exaltata
Astarte cuneiformis Conrad 1840
Astarte undulata Say 1824
    = Astarte undata Gould 1841
Hendy et al. 2008
Astarte perplana Conrad 1840
Thecostraca - Balanomorpha - Balanidae
Balanus proteus Conrad 1834
recombined as Chesaconcavus proteus
Balanus vulcanellus n. sp.
Anthozoa - Scleractinia - Acroporidae
Madrepora palmata Lamarck 1816
recombined as Acropora palmata
unclassified
Cyclopsiella lusatica
Weems and Edwards 2007
Pentadinium cf. latincinctum
Weems and Edwards 2007
subspecies granulatum
Dinophyceae
Spiniferites sp. Mantell 1850
Weems and Edwards 2007
Spiniferites mirabilis Sarjeant 1970
Weems and Edwards 2007
Hystrichosphaeropsis obscura
Weems and Edwards 2007
Dinophyceae - Gonyaulacales
Reticulatosphaera actinocoronata Bujak and Matsuoka 1986
Weems and Edwards 2007
Batiacasphaera sphaerica
Weems and Edwards 2007
Labyrinthodinium truncatum
Weems and Edwards 2007
Dinophyceae - Gonyaulacales - Gonyaulacaceae
Lingulodinium macherophorum
Weems and Edwards 2007
Habibacysta tectata
Weems and Edwards 2007
Operculodinium piaseckii
Weems and Edwards 2007
Operculodinium centrocarpum Wall 1967
Weems and Edwards 2007
Dinophyceae - Peridiniales
Tuberculodinium vancampoae Wall 1967
Weems and Edwards 2007
Dinophyceae - Peridiniales - Deflandreaceae
Palaeocystodinium golzowense Alberti 1961
Weems and Edwards 2007
Dinophyceae - Peridiniales - Protoperidiniaceae
Sumatradinium druggii
Weems and Edwards 2007
Dinophyceae - Peridiniales
Tectatodinium pellitum
Weems and Edwards 2007
unclassified
Crassatella undulata Say 1824
synonym of Kalolophus antillarum
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, 73.9° West
Basis of coordinate:estimated from map
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:14
Regional order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: Cope refers to the beds as "Yorktown" but they are much more likely to be Calvert Formation since the Yorktown is not thought to crop out in Maryland, DN5. Zones 14-16A are regarded as Serravallian in age.

Age and Member after Weems and Edwards (2007).
Lithology and environment
Primary lithology: not reported
Environment:offshore shelf
Geology comments: sparse molluscs, low in diversity; subtropical environment in embayment and dry onshore; area not far from shore, bay, short-term eustatic transgression events, long-term regression trend
Taphonomy
Modes of preservation:body,original phosphate
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:55396
Authorizer:M. Uhen, A. Hendy Enterer:M. Uhen, A. Hendy
Modifier:G. Varnham Research group:marine invertebrate,vertebrate
Created:2005-10-14 11:00:42 Last modified:2022-03-03 05:29:18
Access level:the public Released:2005-10-14 11:00:42
Creative Commons license:CC BY
Reference information

Primary reference:
12189. E. D. Cope. 1867. An addition to the vertebrate fauna of the Miocene period, with a synopsis of the extinct Cetacea of the United States. Proceedings of the Academy of Natural Sciences of Philadelphia 19(4):138-157 [M. Uhen/M. Uhen/M. Carrano]

Secondary references:

14945 P. Bouchet, J.-P. Rocroi, J. Frýda, B. Hausdorf, W. Ponder, A. Valdes, and A. Warén. 2005. A nomenclator and classification of gastropod family-group names. Malacologia 47(1-2):1-368 [P. Wagner/P. Wagner]
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]
12174 E. D. Cope. 1868. Second contribution to the history of the Vertebrata of the Miocene period of the United States. Proceedings of the Academy of Natural Sciences of Philadelphia 1868:184-194 [M. Uhen/M. Uhen/M. Uhen]
12195 E. D. Cope. 1868. [Extinct Cetacea from the Miocene bed of Maryland]. Proceedings of the Academy of Natural Sciences Philadelphia 20(3):159-160 [M. Uhen/M. Uhen/M. Uhen]
19909 A. J. W. Hendy, D. P. Buick, K. V. Bulinski, C. A. Ferguson, and A. I. Miller. 2008. Unpublished census data from Atlantic coastal plain and circum-Caribbean Neogene assemblages and taxonomic opinions. [A. Hendy/A. Hendy/A. Hendy]
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]
29790ETE O. C. Marsh. 1870. Notice of some fossil birds, from the Cretaceous and Tertiary formations of the United States. American Journal of Science and Arts, series 2 49(145):205-217 [M. Uhen/M. Uhen/M. Carrano]
25325 R. E. Weems and L. E. Edwards. 2007. The age and provenance of "Eschrichtius" cephalus Cope (Mammalia: Cetacea). Journal of Vertebrate Paleontology 27(3):752-756 [M. Uhen/M. Uhen]
40145 A. Wetmore. 1926. Observations on Fossil Birds Described from the Miocene of Maryland. The Auk 43(4):462-468 [M. Uhen/M. Shalap]