Shigeta et al 2017 U–Pb age of the Didymoceras awajiense Zon

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Shigeta Y., Tsutsumi Y., Misaki A. (2017) U–Pb age of the Didymoceras awajiense Zone (upper Campanian, Cretaceous) in the Aridagawa area, Wakayama, southwestern Japan // Bull. Natl. Mus. Nat. Sci., Ser. C, 43, pp. 11–18
http://www.kahaku.go.jp/research/resear ... 264964.pdf