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Cooper M.R. (1979) Cretaceous Trigoniidae (Mollusca, Biyalvia) from the Brenton formation, Knysna // Annals of the South African Museum. Vol. 78. Part 6. Pp. 49-67.
The trigoniid fauna from the Brenton Formation at Knysna is described, and two new species, Steinmanella kensleyi and Pterotrigonia savagei, are erected. The age of the fauna is discussed and considered to support a late Valanginian age for the Brenton Formation.