Pebbly Arkose Formation

Pebbly Arkose
Stratigraphic range: Upper Triassic

Pebbly arkose outcrop, Ndepa hill, Kariba District, Zimbabwe
Type Geological formation
Unit of Upper Karoo Group, Karoo Supergroup
Underlies Forest Sandstone Formation
Overlies Escarpment Grit / Angwa Sandstone Formation
Lithology
Primary Sandstone
Type section
Named for Descriptive name
Named by A.M. MacGregor, Zimbabwe Geological Survey

The Pebbly Arkose Formation is a Triassic geologic formation found in southern Africa.

Geology

Description

The formation comprises mainly coarse, arkosic sandstones.[1]

Extent

The Pebbly Arkose Formation is found in Botswana, Zambia and Zimbabwe, in the Mid-Zambezi, Mana Pools, Cabora Bassa and Limpopo basins.

Stratigraphy

The Pebbly Arkose Formation is part of the Upper Karoo Group, overlies the Escarpment formation (in the Mid-Zambezi and Limpopo basins)[2] and the Angwa Sandstone Formation (in the Mana Pools and Cabora Bassa Basins)[3] and underlies the Forest Sandstone Formation.[4]

The Pebbly Arkose has been correlated to the Elliot Formation of the Great Karroo Basin, South Africa[4][5] and the Mpandi Formation of the Thuli Basin in Botswana and Zimbabwe.[6]

Fossils

Flora

Pinales of the Pebbly Arkose Formation
Taxa Presence Notes Images

Form genus: Dadoxylon

 Widespread in the formation[7]

Vertebrate fauna

Rhynchosauria of the Pebbly Arkose Formation
Taxa Presence Notes Images

Genus: Hyperodapedon[8]

 Dande, Mbire District, Zimbabwe[8]
Hyperodapedon
Sauropodomorpha of the Pebbly Arkose Formation
Taxa Presence Notes Images

Genus: not determined[9]

 Zambezi Valley, Zimbabwe[9]

See also

Footnotes

  1. ↑ Love, David; Ravengai, S., Katemaunzanga, D., Shoko, D.S.M., Kambewa, C. and Matura, N.E. (July 2004). "The Karoo sequence in the Nyaminyami area, Zambezi Valley, Zimbabwe". Abstract volume, Geoscience Africa Conference. Johannesburg, South Africa: Geological Society of South Africa. p. 135.
  2. ↑ Bordy, Emese M.; Catuneanu, Octavian (2001). "Sedimentology of the upper Karoo fluvial strata in the Tuli Basin, South Africa". Journal of African Earth Sciences 33 (3–4): 605. Bibcode:2001JAfES..33..605B. doi:10.1016/S0899-5362(01)00090-2.
  3. ↑ d'Engelbronner, E.R. (1996). "New palynological data from Karoo sediments, Mana Pools basin, northern Zimbabwe". Journal of African Earth Sciences 23: 17. Bibcode:1996JAfES..23...17D. doi:10.1016/S0899-5362(96)00049-8.
  4. ↑ 4.0 4.1 Nyambe, Imasiku A.; Utting, John (1997). "Stratigraphy and palynostratigraphy, Karoo Supergroup (Permian and Triassic), mid-Zambezi Valley, southern Zambia". Journal of African Earth Sciences 24 (4): 563. Bibcode:1997JAfES..24..563N. doi:10.1016/S0899-5362(97)00081-X.
  5. ↑ Catuneanu, O.; Wopfner, H.; Eriksson, P.G.; Cairncross, B.; Rubidge, B.S.; Smith, R.M.H.; Hancox, P.J. (2005). "The Karoo basins of south-central Africa". Journal of African Earth Sciences 43: 211. Bibcode:2005JAfES..43..211C. doi:10.1016/j.jafrearsci.2005.07.007.
  6. ↑ Rogers, Raymond R.; Rogers, Kristina Curry; Munyikwa, Darlington; Terry, Rebecca C.; Bradley s.Singer (2004). "Sedimentology and taphonomy of the upper Karoo-equivalent Mpandi Formation in the Tuli Basin of Zimbabwe, with a new 40Ar/39Ar age for the Tuli basalts". Journal of African Earth Sciences 40 (3–4): 147. Bibcode:2004JAfES..40..147R. doi:10.1016/j.jafrearsci.2004.11.004.
  7. ↑ Nugent, Chris (1990). "The Zambezi River: Tectonism, climatic change and drainage evolution". Palaeogeography, Palaeoclimatology, Palaeoecology 78: 55. doi:10.1016/0031-0182(90)90204-K.
  8. ↑ 8.0 8.1 Raath, M. A., Oesterlen, P. M., & Kitching, J. W. (1992). "First record of Triassic Rhynchosauria (Reptilia: Diapsida) from the lower Zambezi Valley, Zimbabwe". Palaentologia Africana 29: 1–10.
  9. ↑ 9.0 9.1 MA Raath (1996). Memoirs of the Queensland Museum 39 (3). Missing or empty |title= (help)

References