Fig. 2. Columnar sections and fossil horizon. A in Differential preservation of the Upper Cretaceous ammonoid Anagaudryceras limatum with corrugated shell in central Hokkaido, Japan

Fig. 2. Columnar sections and fossil horizon. A. Composite columnar section around Shuparo Lake. Modified from Takashima et al. (2004). B. Enlarged columnar section of fossil horizon. All specimens are collected from calcareous concretions embedded in massive, coarse−grained siltstone just below intercalation of greenish sandstone in the lower part of Kashima Formation.