Author: TAKAHASHI, H.
Title: The Isokusa Formation and its Late Upper Jurassic and Early Lower Cretaceous ammonite fauna.
Description: 1973. Tohoku Univ. Sci. Rep. 2nd ser. (Geol.), Spec. vol. no. 6; pp. 319-336, 4 fig. 2 plts. plus descript. pages h.t. Orig. extract, very good.

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