Chesapeake Beach, south of, Zones 3-6: Burdigalian, Maryland

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Perissodactyla - Equidae
Merychippus sp. Leidy 1856
Gazin and Collins 1950 1 specimen
Mammalia - Perissodactyla - Tapiridae
Tapiravus cf. validus (Marsh 1871)
Gazin and Collins 1950 1 specimen
Mammalia - Cetacea
Pelodelphis gracilis Kellogg 1955
Kellogg 1955 2 specimens
nomen dubium belonging to Odontoceti
Mammalia - Cetacea - Platanistidae
Zarhachis flagellator Cope 1868
Kellogg 1924 1 specimen
Mammalia - Cetacea - Squalodontidae
Squalodon calvertensis n. sp. Kellogg 1923
Kellogg 1923 1 specimen
Mammalia - Cetacea
Tretosphys gabbii (Cope 1868)
Kellogg 1955 1 specimen
nomen dubium belonging to Odontoceti
[entered as Tretosphys gabbi]
Mammalia - Cetacea - Kentriodontidae
Kentriodon pernix n. gen., n. sp. Kellogg 1927
Kellogg 1927 1 specimen
(1 measurement)
Mammalia - Cetacea
Delphinodon dividum n. sp. True 1912
1 specimen
recombined as Brevirostrodelphis dividum
[entered as Delphinodon dividium]
Mammalia - Cetacea - Eurhinodelphinidae
Eurhinodelphis bossi n. sp. Kellogg 1925
Kellogg 1925 3 specimens
recombined as Xiphiacetus bossi
Bivalvia - Ostreida - Gryphaeidae
Ostrea percrassa Conrad 1840
Shattuck 1904
recombined as Pycnodonte percrassa
Bivalvia - Pholadida - Corbulidae
Corbula elevata Conrad 1838
Shattuck 1904
recombined as Varicorbula elevata
Bivalvia - Thraciida - Thraciidae
Thracia conradi Couthouy 1839
Shattuck 1904
recombined as Thracia (Homoeodesma) conradi
see common names

Geography
Country:United States State/province:Maryland County:Calvert
Coordinates: 38.7° North, 76.5° West (view map)
Paleocoordinates:38.9° North, 72.6° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
Stage:Burdigalian 10 m.y. bin:Cenozoic 5
Key time interval:Burdigalian
Age range of interval:20.44000 - 15.98000 m.y. ago
Stratigraphy
Geological group:Chesapeake Formation:Calvert
Regional section:Shattuck Regional bed:3-6
Regional order:bottom to top
Stratigraphic resolution:group of beds
Stratigraphy comments: from Shattuck's zones 3 to 5, zone 6 added from Kellogg 1923
Lithology and environment
Primary lithology:diatomaceous,green sandy siltstone
Lithology description: no lithological description given
Environment:offshore
Geology comments: Biologically active, open marine environment
Taphonomy
Modes of preservation:body,original phosphate
Size of fossils:macrofossils
Preservation of anatomical detail:good
Articulated whole bodies:all
Collection methods and comments
Collection methods:surface (in situ),field collection
Collection size:1 specimens
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Metadata
Database number:45493
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:M. Uhen Research group:marine invertebrate,vertebrate
Created:2004-10-25 13:44:39 Last modified:2023-08-17 07:56:14
Access level:the public Released:2004-10-25 13:44:39
Creative Commons license:CC BY
Reference information

Primary reference:
15347. 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]

Secondary references:

33233 R. N. Benson. 1998. Radiolarians and Diatoms from the Pollack Farm Site, Delaware: Marine-Terrestrial Correlation of Miocene Vertebrate Assemblages of the Middle Atlantic Coastal Plain. Delaware Geological Survey Special Publication (21)5-19 [M. Uhen/Z. Tieman]
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]
13413 C. L. Gazin and R. L. Collins. 1950. Remains of land mammals from the Miocene of the Miocene of the Chesapeake Bay Region. Smithsonian Miscellaneous Collections 116(2):1-21 [M. Uhen/M. Uhen/M. Uhen]
85660 S. J. Godfrey and O. Lambert. 2023. Miocene Toothed Whales (Odontoceti) from Calvert Cliffs, Atlantic Coastal Plain, USA. Smithsonian Contributions to Paleobiology 107:29-186 [M. Uhen/M. Uhen]
6031 R. Kellogg. 1923. Description of two squalodonts recently discovered in the Calvert Cliffs, Maryland; and notes on the shark-toothed cetaceans. Proceedings of the U. S. National Museum 62(16):1-69 [M. Uhen/M. Uhen/M. Uhen]
11902 R. Kellogg. 1924. A fossil porpoise from the Calvert Formation of Maryland. Proceedings of the United States National Museum 63(14):1-39 [M. Uhen/M. Uhen/M. Uhen]
11905 R. Kellogg. 1925. On the occurrence of remains of fossil porpoises of the genus Eurhinodelphis in North America. Proceedings of the United States National Museum 66(26):1-40 [M. Uhen/M. Uhen/M. Uhen]
11904 R. Kellogg. 1927. Kentriodon pernix, a Miocene porpoise from Maryland. Proceedings of the United States National Museum 69(19):1-14 [M. Uhen/M. Uhen/M. Uhen]
11925 R. Kellogg. 1955. Three Miocene porpoises from the Calvert Cliffs, Maryland. Proceedings of the United States National Museum 105(3354):101-154 [M. Uhen/M. Uhen/M. Uhen]
11926 R. Kellogg. 1957. Two additional Miocene porpoises from the Calvert Cliffs Maryland. Proceedings of the United States National Museum 107(3387):279-337 [M. Uhen/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]
24251 M. D. Uhen. 2007. USNM Chesapeake Group Cetacean Collection Data. [M. Uhen/M. Uhen]