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References
- ↑ Nicolas, M.; Rubidge, B.S. (2010). "Changes in Permo-Triassic terrestrial tetrapod ecological representation in the Beaufort Group (Karoo Supergroup) of South Africa". Lethaia. 43 (1): 45–59. doi:10.1111/j.1502-3931.2009.00171.x.
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- Carboniferous
- Devonian
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- Ordovician
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| Beaufort Group |
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