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 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

 * Aglaocetus sp.
 * Squalodon calvertensis
 * Eurhinodelphis sp.
 * Parietobalaena palmeri
 * Eobalaenoptera harrisoni
 * Cephalotrophis coronatus
 * Araeodelphis
 * Cetotherium
 * Zarhachis flagellator
 * Pelocetus
 * Xiphiacetus

Pinnipeds

 * Callophoca obscura

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

 * Mergus miscellus
 * Morus loxostylus
 * Calonectris kurodai
 * Heliadornis ashbyi
 * Miocepphus