Angwa Sandstone | |
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Stratigraphic range: Triassic ~ | |
Type | Geological formation |
Unit of | Upper Karoo Group, Karoo Supergroup |
Sub-units | Alternations Mb. Massive Sandstone Mb.[1] |
Underlies | Pebbly Arkose Formation |
Overlies | Lower Karoo Group |
Lithology | |
Primary | Sandstone |
Other | Siltstone |
Location | |
Coordinates | 16°06′25″S 30°18′25″E / 16.107°S 30.307°E[1] |
Country | Mozambique Zambia Zimbabwe |
Type section | |
Named for | Angwa River, Zimbabwe |
Named by | P.M. Oesterlen, Zimbabwe Geological Survey[2] |
The Angwa Sandstone is a geological formation of the mid-Triassic Cabora Bassa Basin [1]and Mana Pools Basin [3]of southern Africa, consisting mainly of sandstone.[4]
The Angwa Sandstone is the lowest formation in the Upper Karoo Group of the Karoo Supergroup, underlying the Pebbly Arkose Formation and overlying the Lower Karoo Group.[5] The formation is divided into two members: the Alternations Member and the Massive Sandstone (Chirambakadoma) Member.[1]
The Angwa Sandstone has been correlated to the Molteno Formation of the Great Karoo Basin, South Africa,[6][1] and to the Escarpment Grit of the Mid-Zambezi Basin.[7]
The formation is a sedimentary unit, consisting mainly of fluvial sands and silts.[1]
It has been dated as covering rocks from much of the Triassic, with pollen and flora identified from the Induan, and Ladinian to Norian.[6][8]
The Angwa Sandstone Formation is found in Mozambique, Zambia, Zimbabwe, in the Mana Pools and Cabora Bassa Basins.
Pinales of the Angwa Sandstone | ||||
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Genus | Presence | Notes | Images | |
Dadoxylon | Mbire District and Chirundu, Zimbabwe |
Callistophytaceae (Pteridospermopsida) of the Angwa Sandstone | ||||
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Genus | Presence | Notes | Images | |
Lepidopteris | Manyima River, Mbire District, Zimbabwe | |||
Dicroidium | Manyima River, Mbire District, Zimbabwe |
Ginkgoales of the Angwa Sandstone | ||||
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Genus | Presence | Notes | Images | |
Sphenobaiera | Manyima River, Mbire District, Zimbabwe |