Pebbly Arkose Formation
Geologic formation in southern Africa
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The Pebbly Arkose Formation is a Late Triassic geologic formation found in southern Africa.
| Pebbly Arkose | |
|---|---|
| Stratigraphic range: Carnian ~ | |
Pebbly arkose outcrop, Ndepa hill, Kariba District, Zimbabwe | |
| Type | Geological formation |
| Unit of | Upper Karoo Group, Karoo Supergroup |
| Underlies | Forest Sandstone |
| Overlies | Escarpment Grit & Angwa Sandstone |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates | 16.2°S 30.3°E |
| Approximate paleocoordinates | 50.8°S 11.9°E |
| Region | Mashonaland Central & West |
| Country | Botswana Zambia Zimbabwe |
| Type section | |
| Named for | Descriptive name |
| Named by | A.M. MacGregor, Zimbabwe Geological Survey |
  Pebbly Arkose Formation (Africa)  Pebbly Arkose Formation (Zimbabwe) | |
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]
Fossil content
Flora
Vertebrate fauna
Archosaur
| Archosaurs of the Pebbly Arkose Formation | |||||
|---|---|---|---|---|---|
| Taxon | Species | Presence | Materials | Notes | Images |
| Mbiresaurus[8] | M. raathi | Dande Communal Land. | A complete partially-articulated skeleton. | An early member of Sauropodomorpha | |
| Musankwa[9] | M. sanyatiensis | Spurwing Island. | An articulated partial right leg. | A basal massopodan sauropodomorph |
 |
| Massospondylus | M. sp. | Spurwing Island. | A basal sauropodomorph. | ||
| Aetosaur[8] | Indeterminate. | ||||
| Herrerasaurid[8] | Indeterminate | Dande Communal Land. | |||
Reptiles
| Rhynchosauria of the Pebbly Arkose Formation | |||||
|---|---|---|---|---|---|
| Taxon | Species | Presence | Materials | Notes | Images |
| Hyperodapedon[10] | Dande, Mbire District, Zimbabwe[10] |  | |||
Synapsids
| Synapsida of the Pebbly Arkose Formation | |||||
|---|---|---|---|---|---|
| Taxon | Species | Presence | Materials | Notes | Images |
| Dicynodontia | Indeterminate. | A possible dicynodont[8] | |||
| Gomphodontosuchine[8] | A traversodontid cynodont. | ||||
Fish
| Fish of the Pebbly Arkose Formation | |||||
|---|---|---|---|---|---|
| Taxon | Species | Presence | Materials | Notes | Images |
| Ferganoceratodus[11] | F. edwardsi | A ceratodontiform lungfish | |||