Английская Википедия:Ganigobis Formation
Шаблон:Short description Шаблон:Infobox rockunit
The Ganigobis Formation is a Late Carboniferous (Gzhelian) to Early Permian (Artinskian) geologic formation of the Dwyka Group in the ǁKaras Region of southeastern Namibia and the Northern Cape of South Africa. The widespread formation was deposited in the Aranos and Karoo Basins of southern Africa.
Description
The Ganigobis Formation is an extensive unit with a maximum thickness of Шаблон:Convert evidenced in the Vreda borehole.[1] The conglomerates, sandstones, shales and tuff of the formation were deposited in a glacio-lacustrine to marine environment.[2][3] The Ganigobis Formation provides fossil fish as well as bivalves (e.g. Nuculopsis), gastropods (e.g. Peruvispira), scyphozoa (e.g. Conularia), crinoid stalks, foraminifera (Hyperammina, Ammodiscus, Glomospira, Ammobacculites and Spiroplectammina),[4] sponges and sponge spicules, radiolaria, coprolites and permineralised wood.[5]
Zircons of the Ganigobis Shale Member yield SHRIMP-ages of 302-300 Ma. This dates the uppermost part of the second deglaciation sequence in southern Namibia to the Late Carboniferous (Gzelian) and provides a minimum age for the onset of Karoo-equivalent marine deposition. The age of the uppermost argillaceous part of the third deglaciation sequence (297 Ma) was determined from zircons of a tuffaceous bed sampled in a roadcut in the Western Cape Province, South Africa.[5]
Fossil content
Among others, the following fossils are reported from the formation:[6][7][8]
- Fish
See also
- List of fossiliferous stratigraphic units in Namibia
- List of fossiliferous stratigraphic units in South Africa
- Geology of Namibia
- Geology of South Africa
- Irati Formation
References
Bibliography
Further reading
- B. G. Gardiner. 1962. Namaichthys schroederi Gürich and other Palaeozoic Fishes from South Africa. Palaeontology 5(1):9-21
Шаблон:Geology of South Africa
- ↑ Bangert et al., 2000, p.266
- ↑ Ganigobis Formation at Fossilworks.org
- ↑ Bangert, 2000, p.21
- ↑ Bangert, 2000, p.60
- ↑ 5,0 5,1 Bangert, 2000, p.3
- ↑ Ganigobis at Fossilworks.org
- ↑ Wesselton Mine, Kimberley at Fossilworks.org
- ↑ Ganigobis, near Tses Station at Fossilworks.org
- Английская Википедия
- Geologic formations of Namibia
- Geologic formations of South Africa
- Carboniferous System of Africa
- Permian System of Africa
- Carboniferous South Africa
- Permian South Africa
- Artinskian Stage
- Gzhelian
- Shale formations
- Conglomerate formations
- Sandstone formations
- Tuff formations
- Glacial deposits
- Lacustrine deposits
- Shallow marine deposits
- Carboniferous southern paleotemperate deposits
- Permian southern paleotemperate deposits
- Paleontology in Namibia
- Paleontology in South Africa
- Geography of ǁKaras Region
- Geography of the Northern Cape
- Karoo
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- Страницы с телепортом
- Википедия
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