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| details | Portlandian | England(Dorset) | Sarjeant,W.A.S. Dinoflagellate cysts with Gonyaulax-type Tabulation. (In: Studies on Mesozoic and Cainozoic Dinoflagellate Cysts. R.J.Davey, C.Downie, W.A.S.Sarjeant and G.L.Williams) | 1966 |