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Tropidostoma Assemblage Zone
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The Tropidostoma Assemblage Zone is a tetrapod assemblage zone or biozone which correlates to the lower Teekloof Formation, Adelaide Subgroup of the Beaufort Group, a fossiliferous and geologically important geological Group of the Karoo Supergroup in South Africa.[1] The thickest outcrops, reaching approximately 240 metres (790 ft), occur from east of Sutherland through to Beaufort West and Victoria West, to areas south of Graaff-Reinet. Its northernmost exposures occur west/north-west of Colesberg. The Tropidostoma Assemblage Zone is the fourth biozone of the Beaufort Group.[2][3][4]
Tropidostoma Assemblage Zone | |
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Stratigraphic range: Late Permian | |
![]() Tropidostoma microtrema | |
Type | Biozone |
Unit of | Lower Teekloof Formation, Adelaide Subgroup of the Beaufort Group |
Underlies | Cistecephalus Assemblage Zone |
Overlies | Pristerognathus Assemblage Zone |
Thickness | up to 787.402 feet (240 m) |
Location | |
Region | Northern, Western & Eastern Cape |
Country | ![]() |
Extent | Karoo Basin |
Type section | |
Named for | Tropidostoma microtrema |
Named by | Keyster & Smith |
Year defined | 1978-79 |
The name of the biozone refers to Tropidostoma microtrema, a herbivorous dicynodont therapsid. This biozone is characterized by the presence of this species in association with another dicynodont species, Endothiodon uniseries.