Type Geological formation Overlies Lower Karoo Group | Named for Angwa River, Zimbabwe Underlies Pebbly Arkose Formation | |
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Country Mozambique, Zambia, Zimbabwe Unit of Upper Karoo Group, Karoo Supergroup | ||
The Angwa Sandstone Formation is a geological formation of the mid-Triassic, consisting mainly of sandstone.
Contents
Geology
The formation is a sedimentary unit, consisting mainly of fluvial sands and silts.
It has been dated as covering rocks from much of the Triassic, with pollen and flora identified from the Induan, and Ladinian to Norian.
Stratigraphy
The Angwa Sandstone is the lowest formation in the Upper Karoo Group of the Karoo Supergroup, lying below the Pebbly Arkose Formation and overlting the Lower Karoo Group. The formation is divided into two members: the Alternations Member and the Massive Sandstone (Chirambakadoma) Member.
The Angwa Sandstone has been correlated to the Molteno Formation of the Great Karroo Basin, South Africa and to the Escarpment Grit of the Mid-Zambezi Basin.
Occurrence
The Angwa Sandstone Formation is found in Mozambique, Zambia, Zimbabwe, in the Mana Pools and Cabora Bassa basins.