Coordinates: 11°00′N 78°54′E / 11.0°N 78.90°E / 11.0; 78.90

Karai Formation

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Karai Formation
Stratigraphic range: Albian to Turonian
~105.5–89.3 Ma
TypeGeological formation
Sub-unitsOdiyam & Kunnam Members
UnderliesUnconformity with the Kulakkalnattam formation
OverliesUttatur Group
Lithology
PrimaryMudstone
Location
CoordinatesLua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value).
RegionTamil Nadu, Cauvery basin
CountryIndia

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]

Paleobiota

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Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Ichthyosaurs

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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 (DUGF/41-45)
  • One juvenile tooth (DUGF/46)
  • 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

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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]

Mollusk

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Mollusks from the Karai Formation
Genus Species Location Material Notes Images
Acanthoceras A. rhotomagense An Acanthoceratidae Ammonite.
Calycoceras
  • C. asiaticum
  • C. naviculare
 An Acanthoceratidae Ammonite.
Pseudocalycoceras
  • P. harpax
  • sp.
 An Acanthoceratidae Ammonite.
Kunnamiceras K. tropicum An Acanthoceratidae Ammonite.
Eucalycoceras E. pentagonum An Acanthoceratidae Ammonite.
Lotzeites L. aberrans An Acanthoceratidae Ammonite.
Desmoceras
  • D. latidorsatum
  • sp.
 A Desmoceratidae Ammonite.
Sciponoceras sp. A Baculitidae Ammonite.
Phylloceras P. seresitense A Phylloceratidae Ammonite.
Holcodiscoides H. elegans A Kossmaticeratidae Ammonite.
Cymatoceras C. huxleyanum A Nautilidae.
Eutrephoceras E. justum A Nautilidae.
Pycnodonte P. vesicularis An Oyster.

References

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  1. ^ a b c d e f g h i j Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  2. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  3. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  4. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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