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Geologic formation in United States From Wikipedia, the free encyclopedia
The St. Marys Formation is a geologic formation in Maryland and Virginia, United States. It preserves fossils dating back to the Miocene Epoch of the Neogene period. It is the youngest Miocene formation present in the Calvert Cliffs and is part of the Chesapeake Group.
St. Marys Formation | |
---|---|
Stratigraphic range: Neogene | |
Type | Formation |
Unit of | Chesapeake Group |
Underlies | Eastover Formation |
Overlies | Choptank Formation |
Location | |
Region | ![]() ![]() |
Country | ![]() |
A diverse vertebrate paleofauna is known from the St. Marys Formation:
Genus | Species | Notes | Tooth example | Ref. |
---|---|---|---|---|
Notorynchus | N. primigenius | This species is possibly synonymous with the broadnose sevengill shark. | ![]() |
[1] |
Hexanchus | H. gigas | A species of cow shark. This species is extremely rare in this formation. | ![]() |
[1] |
Squalus | Commonly known as the spurdog. | [1] | ||
Squatina | Commonly known as the angel shark. | [1] | ||
Rhincodon | R. typus | Commonly known as the whale shark. This species is extremely rare in this formation. | ![]() |
[1] |
Carcharodon | C. hastalis | Putative ancestor to the extant great white shark | ![]() |
[1] |
Carcharomodus | C. escheri | Commonly known as Escher's mako. It is also known as Carcharodon subserratus and is sometimes placed in Isurus. It is extremely rare in this formation. | ![]() |
[1] |
Otodus | O. megalodon | This is the largest shark known to have existed. | ![]() |
[1] |
Alopias | A. latidens | This species may be synonymous with the extant common thresher shark. | ![]() |
[1] |
Mustelus | Commonly known as smooth-hounds | [1] | ||
Hemipristis | H. serra | Commonly known as the snaggletooth shark. It is related to the extant snaggletooth shark. | ![]() |
[1] |
Carcharhinus | C. falciformus | Commonly known as the silky shark. | ![]() |
[1] |
C. leucas | Commonly known as the bull shark | ![]() |
[1] | |
C. perezii | Commonly known as the Caribbean reef shark | ![]() |
[1] | |
C. priscus | An extinct requiem shark | [1] | ||
C. plumbeus | Commonly known as the sandbar shark | ![]() |
[1] | |
Negaprion | N. brevrostris | Commonly known as the lemon shark | ![]() |
[1] |
Rhizoprionodon | Commonly known as the sharpnose shark | [1] | ||
Pteromylaeus | Commonly known as the bull ray | [1] | ||
Aetobatus | Commonly known as the eagle ray | [1] |
Genus | Notes | Image | Ref. |
---|---|---|---|
Acipenseridae gen. indet. | ![]() |
[1] | |
Lepisosteus | ![]() |
[1] | |
Amia | cf. A. calva | ![]() |
[1] |
Alosa | ![]() |
[1] | |
Ictalurus | ![]() |
[1] | |
Merluccius | ![]() |
[1] | |
Belone | B. countermani | [1][2] | |
Prionotus | ![]() |
[1] | |
Agonidae gen. indet. | ![]() |
[1] | |
"Paralbula" | "P." dorisiae | [1] | |
Lagodon | ![]() |
[1] | |
Stenotomus | ![]() |
[1] | |
Pogonias | ![]() |
[1] | |
Sciaenops | ![]() |
[1] | |
Tautoga | ![]() |
[1] | |
Astroscopus | A. countermani | ![]() |
[3][1] |
Sphyraena | [1] | ||
Istiophoridae gen. indet. | ![]() |
[1] |
Genus | Species | Notes | Image | Ref. |
---|---|---|---|---|
Thecachampsa | T. antiquus | A Tomistominae | ![]() |
[1] |
Type | Genus | Species | Notes | Image | Ref. |
---|---|---|---|---|---|
Sirenians (sea cows) | Metaxytherium | M. floridanum | ![]() |
[1] | |
Cetaceans (whales, dolphins and porpoises) | Aulophyseter | A. mediatlanticus | A sperm whale | ![]() |
[4] |
Lophocetus | L. calvertensis | [5] | |||
Messapicetus | ![]() |
[6] | |||
Stenasodelphis | S. russellae | [7] |
Name | Notes | Images | Ref. |
---|---|---|---|
Procamelus | cf. P. minor | [8] | |
Desmathyus | [8] | ||
Tapirus | [8] | ||
Neohipparion lenticulare | ![]() |
[8] | |
Equidae indet. | Larger than Parahippus | [8] | |
Rhinoceratidae | [8] | ||
Cormohipparion | ![]() |
[8] |
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