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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 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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