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Takatika Grit

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Takatika Grit
Stratigraphic range: Paleocene, 65–64 Ma
↓
TypeFormation
UnderliesTutuiri Greensand
OverliesChatham Schist
Location
Region Chatham Islands (Chatham Island)
Country New Zealand

The Takatika Grit is a geologic formation in Chatham Island, New Zealand (Tioriori). It preserves fossils dating back to the Paleocene period, although it also preserves disturbed and re-worked Maastrichtian and Campanian microfossils and possibly also re-worked theropod fossils.

The exact date of the formation is unknown, but it is generally accepted that the formation was laid down around ca.65-64 million years ago, with the formation possibly being as old as ca.83 Ma and/or as young as 61 Ma.

Paleofauna

Paleofauna of the Takatika Grit
Genus Species Location Stratigraphic position Abundance Notes
Astrophorida .indet[1] indeterminate Tioriori Only fragmentary spicules are known
Auloplax? (Dactylocalycidae indet.?)[1] A? sp. Tioriori Hexactinellid sponge
Bacillariophyceae indet.[2] Indeterminate Tioriori Diatoms from the Takatika Grit date back to the Danian and Campanian
Dinoflagellata indet.[2] Indeterminate Tioriori Dinoflagellates from the Takatika Grit date back to the Danian and Campanian
Eotretochone[1] E. australis Tioriori Hexactinellid sponge
Euretidae indet.[1] Indeterminate Tioriori
Lithistida indet.[1] Indeterminate Tioriori Known from scarce weathered fragments
Lycopodiopsida indet.[3] Indeterminate Tioriori
Radiolaria indet.[2] Indeterminate Tioriori Radiolarians from the Takatika Grit date back to the Danian and Campanian
Pararete[1] P sp. Tioriori Hexactinellid sponge

Theropoda indet. (Takatika Grit theropod)[3]

Indeterminate

Tioriori lower (?) Takatika Grit Possible Paleogene non-avian dinosaur, although the remains are probably Maastrichtian or Campanian in age.[4][5] Discovered in March 2003.[3][6]
Tretodictyiidae indet.[1] Indeterminate Tioriori

See also

References

  1. ^ a b c d e f g Consoli, C., Pisera, A., & Stilwell, J. (2009). Siliceous Sponges of the Takatika Grit (Cretaceous-Paleogene), Chatham Islands, South Pacific. Journal of Paleontology, 83(5), 811-819. Retrieved July 8, 2020, from www.jstor.org/stable/20627664
  2. ^ a b c Hollis, C.J, Stickley, C.E., Bijl, P.K., Schiøler, P., Clowes, C.D., Li, X, Campbell, H. March 2017. The age of the Takatika Grit, Chatham Islands, New Zealand. Alcheringa 41, xxx–xxx. ISSN 0311-5518.
  3. ^ a b c Stilwell, J.D.; Consoli, C.P.; Sutherland, R.; Salisbury, S.; Rich, T.H.; Vickers-Rich, P.A.; Currie, P.J.; Wilson, G.J. (2006). "Dinosaur sanctuary on the Chatham Islands, Southwest Pacific: First record of theropods from the K–T boundary Takatika Grit". Palaeogeography, Palaeoclimatology, Palaeoecology. 230 (4): 243–250. doi:10.1016/j.palaeo.2005.07.017.
  4. ^ Fordyce, R. E. 2006. New light on New Zealand Mesozoic reptiles. Geological Society of New Zealand newsletter 140: 6-15.
  5. ^ Haw, D. 2002. The discovery of fossils in Mangahouanga Stream. Geological Society of New Zealand newsletter 129: 13-14.
  6. ^ Fordyce, R. E. 2003. Fossils and the history of life. Pp 35-64 in Darby, J. T., Fordyce, R. E., Mark, A. F., Probert, P. K., & Townsend, C. R. (eds), The natural history of southern New Zealand. University of Otago Press, Dunedin. 387 p.
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