Karai Formation | |
---|---|
Stratigraphic range: | |
Type | Geological formation |
Sub-units | Odiyam & Kunnam Members |
Underlies | Unconformity with the Kulakkalnattam formation |
Overlies | Uttatur Group |
Lithology | |
Primary | Mudstone |
Location | |
Coordinates | 11°00′N 78°54′E / 11.0°N 78.90°E |
Region | Tamil Nadu, Cauvery basin |
Country | India |
[[File:.|frameless|upright=1.1]] |
The Karai Formation is a Mesozoic (Albian to Turonian) geologic formation in India. Fossilized ichthyosaur remains and shark teeth have been reported from this formation.[1]
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Ichthyosaurs from the Karai Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Material | Notes | Images | |
Ichthyosauria | indet.[2] | Vertebrae. | Previously known as "Platypterygius indicus".[3] | |||
Ichthyosaurus[4] | I. indicus | A few complete and one partially complete vertebrae. | Considered a nomen dubium.[5] | |||
Ichthyosauria | indet.[6] | Six adult teeth, one juvenile tooth and seven partial vertebrae. | Was tentatively assigned to P. indicus. It is similar to other species of Platypterygius.[1] It was later noted that only one of the teeth can be assigned to Platypterygiinae.[6] | |||
Platypterygius | P. sp. indet. | An Anterior caudal vertebra. | A Platypterygiine ichthyosaur.[7] |
Chondrichthyans from the Karai Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Material | Notes | Images | |
Protosqualus | P. sp. | One incomplete tooth. | A Squalid shark.[1] | |||
Gladioserratus | G. magnus | One lower lateral tooth. | A Hexanchid shark.[1] | |||
?Notidanodon | ?N. sp. | One tooth fragment. | A Hexanchid shark.[1] | |||
Cretalamna | C. appendiculaia | Twenty-five teeth. | An Otodontid shark.[1] | |||
Dwardius | D. sudindicus | Over a hundred teeth. | A Lamniform shark.[1] | |||
?Eostriatolamia | ?E. sp. | One upper lateral tooth and a cusp of an anterior tooth. | An Odontaspidid shark.[1] | |||
Squalicorax | S. aff. baharijensis | Five complete and two fragmentary teeth. | An Anacoracid shark.[1] | |||
Cretodus | C. longiplicatus | Fifteen teeth. | A Lamniform shark.[1] |