Choptank Formation
Appearance
Choptank Formation | |
---|---|
Stratigraphic range: Miocene | |
![]() Chesapecten nefrens, Choptank Formation | |
Type | Formation |
Unit of | Chesapeake Group |
Underlies | St. Marys Formation |
Overlies | Calvert Formation |
Location | |
Region | Virginia, Maryland |
Country | United States |
Type section | |
Named for | Choptank River |
The Choptank Formation is a geologic formation in Virginia. It preserves fossils dating back to the Miocene epoch of the Neogene period.
Fossils
The Choptank Formation is extremely fossiliferous. Some of the fossil species represented include the following:[1][2]
Sharks
- Carcharocles megalodon
- Carcharodon hastalis
- Isurus oxyrhincus
- Carcharomodus escheri
- Physogaleus contortus
- Galeocerdo aduncus
- Carcharhinus
- Hemipristis serra
- Squatinasp.
- Notorhyncus cepedianus
- Carcharias
- Isurus retroflexus
- Parotodus benedeni
- Alopias vulpinus
- Alopias grandis
- Cetorhinus
- Negaprion brevirostris
- Rhizoprionodon
- Sphryna laevissima
Rays and Other Cartilaginous Fish
- Aetobatus arcuatus
- Pteromyaleus sp.
- Dasyatis rugosa
- Dasyatis probsti
- Pinthicus stenodon
Fish
- Acipenseridae indet.
- Opsanus sp.
- Serranidaesp.
- Pogonias sp.
- Sciaenops sp.
- Tautoga sp.
- Acanthocybium cf. solandri
- Thunnus sp.
- Istiophorus cf. platypterus
- Mola cf. pileata
- Ariopsis aff. A. felis
- Trisopterus sculptus
- Micromesistius cognatus
- Prionotus
Cetaceans
- Aglaocetus sp.
- Cetotheriumsp.
- Delphinodon sp.
- Eurhinodelphis sp.
- Macrokentriodon morani
- Mesocetus
- Parietobalaena
- Orycterocetus
- Pelocetus
Pinnipeds
- Callophoca obscura
- Leptophoca proxima
- Prophoca sp.
Crocodilians
- Thecachampsa antiquus
- Thecachampsa sericodon
Invertebrates[3]
- Chesapecten nefrens
- Chesacardium
- Euspira heros
- Mariacolpus octonnaria
- Macrocallista marylandica
- Stewartia anodonta
- Marvacrassitella marylandica
- Ecphora
- Panopea
- Albertella aberti
Terrestrial Mammals
- Cynarctus wangi
- Gomphotherium calvertensis
- Hipparion cf. phosphorum
See also
- List of fossiliferous stratigraphic units in Virginia
- Paleontology in Virginia
- Paleontology in Maryland
- Calvert Cliffs State Park
- List of fossiliferous stratigraphic units in Maryland
- Chesapeake Group
References
- ^ Godfrey, Stephen J., ed. (2018-09-25). "The Geology and Vertebrate Paleontology of Calvert Cliffs, Maryland, USA". Smithsonian Contributions to Paleobiology (100): 2–274. doi:10.5479/si.1943-6688.100. ISSN 1943-6688.
- ^ "Paleobiology Collections Search". collections.nmnh.si.edu. Retrieved 2020-08-14.
- ^ "Collections". The Fossil Forum. Retrieved 2020-08-14.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.
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