Calvert Formation

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

The Calvert Formation is extremely fossiliferous. Some of the fossil species represented include the following:

Sharks

Otodus megalodonOtodus chubutensisCarcharodon hastalisIsurus oxyrhincusPhysogaleus contortusPhysogaleus hemmooriensisGaleocerdo aduncusCarcharhinus egertoniHemipristis serraSquatina sp.Squalus sp.Echinorhinus blakeiNotorhyncus cepedianusHexanchus gigasCarchariasCarcharoides catticusIsurus retroflexusParotodus benedeniAlopias vulpinusAlopias latidensAlopias grandisAlopias palatasiCetorhinusRhincodon sp.Negaprion brevirostrisRhizoprionodonSphryna laevissimaMustelus sp.

''Scyliorhinidae sp.''

Rays and other cartilaginous fish

Mobula pectinataMobula fragilisMobula loupianensisPlinthicus stenodonRhinoptera cf. R. studeriAetobatus arcuatusPteromylaeus sp.Dasyatis probstiDasyatis rugosaPristis sp.Edaphodon sp.

''Chimaera sp.''

Bony fish

Acipenseridae indet.Bagre sp.Brotula sp.Pogonias sp.Sciaenops sp.Tautoga sp.Acanthocybium cf. solandriThunnus sp.Istiophoruscf. platypterusRanzania grahamiRanzania tenneyorumAriopsis stauroforusTrisopterus sculptusMicromesistius cognatusPrionotusLophius sp.Paralbula dorisiaeMoroneLophokatilus ereboorensisRachycentron sp.Pomatomus sp.Lagodon sp.Micropogonias sp.Sphyraena sp.Sarda sp.Makaira cf. nigricans

''Chilomycterus sp.''

Cetaceans

Pinnipeds

Callophoca obscura

''Leptophoca''

Crocodilians

Thecachampsa antiquus

''Thecachampsa sericodon''

Invertebrates

Chesapecten nefrensChesapecten coccymelusIsognomon sp.Ecphora

''Architectonica trilineata''

Terrestrial mammals

Cynarctus marylandicaTomarctus brevirostrisGomphotherium calvertensisHipparion cf. phosphorumAmphicyon cf. frendensAmphicyon intermediusAphelops sp.

''Archaeohippus cf. blackbergi''

Birds

Mergus miscellusMorus loxostylusCalonectris kurodaiHeliadornis ashbyiMiocepphus

''Pelagornis''