Helical burrow casts of therapsid origin from the Beaufort Group (Permian) of South Africa

Palaeogeography, Palaeoclimatology, Palaeoecology - Tập 60 - Trang 155-169 - 1987
Roger M.H. Smith1
1Department of Karoo Palaeontology, South African Museum, P.O. Box 61, Cape Town, 8000 South Africa

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