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Query: keyword: "ammonite zones"

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 Article: Ammonite stratigraphy of the Valanginian to Barremian for the Mediterranean region
J. Klein, P.J. Hoedemaeker, in: Scripta Geologica. Special Issue, Vol. 3 (1999), p. 97-127
 Article: Substantiation of the Barremian/Aptian boundary
T.N. Bogdanova, V.A. Prozorovsky, in: Scripta Geologica. Special Issue, Vol. 3 (1999), p. 45-81