Fig. 2 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan

Fig. 2. Composite columnar sections in the Mikasa (A), Obira (B), and Oyubari (C) areas and the stratigraphical levels of macrofossil datum planes used in the present study. The shaded portion shows the Cenomanian–Turonian boundary event (CTBE). The molluscan fossil data are from Tanabe et al. (1977), Futakami (1986), Kurihara and Kawabe (2003), Funaki and Hirano (2004), Kurihara et al. (2007) and unpublished original data. The planktonic foraminiferal zonation and the CTBE are from Hasegawa (1997, 1999), Nishi et al. (2003), Kurihara (2006), and Uramoto et al. (2007, 2009). Abbreviations: Ka, Katsurazawa Formation; Hk, Hikagenosawa Formation; mdst, mudstone; sdst, sandstone; A. nipponicus, Actinoceramus nipponicus; Hel. helvetica, Helvetoglobotruncana helvetica; I. hobetsensis, Inoceramus hobetsensis nonsulcatus; I. kamuy, Inoceramus kamuy; W. arc., Whiteinella archaeocretacea.