Evidence from South Africa for a protracted end-Permian extinction on land by Viglietti, PA, Benson, RBJ, Smith, RMH, Botha, J, Kammerer, CF, Skosan, Z, Butler, E, Crean, A, Eloff, B, Kaal, S, Mohoi, J, Molehe, W, Mtalana, N, Mtungata, S, Ntheri, N, Ntsala, T, Nyaphuli, J, October, P, Skinner, G, Strong, M, Stummer, H, Wolvaardt, FP, Angielczyk, KD