Calvert Formation
{{Short description|Geologic formation in the United States}}
{{Infobox rockunit
|name=Calvert Formation
|image=2016-07-20 10 17 03 Cliffs to the south of Grays Creek in Calvert Cliffs State Park, Calvert County, Maryland.jpg
|caption=Outcrops of the Calvert Formation at the Calvert Cliffs State Park
|country=United States
|map=
|area=
|extent=
|thickness=
|overlies=Old Church Formation
|underlies=Choptank Formation
|subunits=
|unitof=Chesapeake Group
|coordinates=
|region=Maryland, Virginia, Delaware
|namedby=|namedfor=Calvert County
|otherlithology=
|prilithology=
|period=Neogene
|age=Miocene
|type=Formation
|map_caption=}}
The Calvert Formation is a geologic formation in Maryland, Virginia, and Delaware. It preserves fossils dating back to the early to middle Miocene epoch of the Neogene period. It is one of the three formations which make up the Calvert Cliffs, all of which are part of the Chesapeake Group.
Fossils
File:Calvert Zone 10 Calvert Co MD 2.jpg
The Calvert Formation is extremely fossiliferous. Some of the fossil species represented include the following:{{Cite journal|date=2018-09-25|editor-last=Godfrey|editor-first=Stephen J.|title=The Geology and Vertebrate Paleontology of Calvert Cliffs, Maryland, USA|journal=Smithsonian Contributions to Paleobiology|issue=100|pages=2–274|doi=10.5479/si.1943-6688.100|issn=1943-6688|doi-access=free}}{{Cite web|title=Paleobiology Collections Search|url=https://collections.nmnh.si.edu/search/paleo/|access-date=2020-08-14|website=collections.nmnh.si.edu}}
= Sharks =
- Otodus megalodon
- Otodus chubutensis
- Carcharodon hastalis
- Isurus oxyrhincus
- Physogaleus contortus
- Physogaleus hemmooriensis
- Galeocerdo aduncus
- Carcharhinus egertoni
- Hemipristis serra
- Squatina sp.
- Squalus sp.
- Echinorhinus blakei
- Notorhyncus cepedianus
- Hexanchus gigas
- Carcharias
- Carcharoides catticus
- Isurus retroflexus
- Parotodus benedeni
- Alopias vulpinus
- Alopias grandis
- Alopias palatasi
- Cetorhinus
- Rhincodon sp.
- Negaprion brevirostris
- Rhizoprionodon
- Sphryna laevissima
- Mustelus sp.
- Scyliorhinidae sp.
= Rays and other cartilaginous fish =
- Mobula pectinata
- Mobula fragilis
- Mobula loupianensis
- Plinthicus stenodon
- Rhinoptera cf. R. studeri
- Aetobatus arcuatus
- Pteromylaeus sp.
- Dasyatis probsti
- Dasyatis rugosa
- Pristis sp.
- Edaphodon sp.
- Chimaera sp.
= Bony fish =
- Acipenseridae indet.
- Bagre sp.
- Brotula sp.
- Pogonias sp.
- Sciaenops sp.
- Tautoga sp.
- Acanthocybium cf. solandri
- Thunnus sp.
- Istiophoruscf. platypterus
- Ranzania grahami
- Ranzania tenneyorum
- Ariopsis stauroforus
- Trisopterus sculptus
- Micromesistius cognatus
- Prionotus
- Lophius sp.
- Paralbula dorisiae
- Morone
- Lophokatilus ereboorensis
- Rachycentron sp.
- Pomatomus sp.
- Lagodon sp.
- Micropogonias sp.
- Sphyraena sp.
- Sarda sp.
- Makaira cf. nigricans
- Chilomycterus sp.
= Cetaceans =
= Pinnipeds =
= Crocodilians =
- Thecachampsa antiquus
- Thecachampsa sericodon
= Invertebrates =
- Chesapecten nefrens
- Chesapecten coccymelus
- Isognomon sp.
- Ecphora
- Architectonica trilineata
= Terrestrial mammals =
- Cynarctus marylandica
- ''Tomarctus brevirostris'
- Gomphotherium calvertensis
- Hipparion cf. phosphorum
- Amphicyon cf. frendens
- Amphicyon intermedius
- Aphelops sp.
- Archaeohippus cf. blackbergi
= Birds =
See also
{{Portal|Earth sciences|Virginia|Paleontology
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