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6 results for “Anagaudryceras”
Fig. 6 in Differential preservation of the Upper Cretaceous ammonoid Anagaudryceras limatum with corrugated shell in central Hokkaido, Japan
Fig. 6. Schematic drawing of shell cross−section in Anagaudryceras limatum. Compressive force in sediments concentrates on just adoral of last septum and acted on corrugated shell material as bending force. Vertical (A) and horizontal (B) burial orientations.
Fig. 4 in Differential preservation of the Upper Cretaceous ammonoid Anagaudryceras limatum with corrugated shell in central Hokkaido, Japan
Fig. 4. Comparison of taphonomic attributes between Anagaudryceras limatum (Yabe, 1903) and other planispiral ammonoids. A. Fragmentation patterns. Numbers around pie diagrams signify number of individuals in each category. B. Size−distribution patterns and mean shell diameters of specimens whose diameters can be measured. Categories: a, intact; b, phragmocones with distorted body chamber; c, phragmocones lacking body chambers; d, isolated body chamber parts; e, indeterminate.
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.
Fig. 5 in Differential preservation of the Upper Cretaceous ammonoid Anagaudryceras limatum with corrugated shell in central Hokkaido, Japan
Fig. 5. Bending force on corrugated and flat materials. A. Bending force concentrates on tops and bottoms of corrugations, resulting in fracturing easier than flat material. B. Bending force uniformly acts on flat material.
Fig. 3 in Differential preservation of the Upper Cretaceous ammonoid Anagaudryceras limatum with corrugated shell in central Hokkaido, Japan
Fig. 3. Categories of shell fragmentation patterns. A. Intact, NSM PM 17534. B. Phragmocones with distorted body chamber, with radial edges almost straight or paralleling growth lines, and located just adoral of last septum, NSM PM 17535. Note body chamber part retaining their original morphology. C. Phragmocones lacking body chambers, with edges almost straight or parallel to growth lines, and located just adoral of last septum, NSM PM 17536. D. Isolated body chamber parts, NSM PM 17537, lateral (D1 and D3) and ventral (D2) views. Note lower jaw (arrow) preserved near separated body chamber. All specimens belong to late Turonian (Late Cretaceous) lytoceratid ammonoid Anagaudryceras limatum (Yabe, 1903) from the Oyubari area in the central Hokkaido, Japan. Specimen B is from locality NSM PCL 4−24−1, and all the others are from NSM PCL 4−24−2. Triangles indicate position of last septum.
Fig. 1 in Differential preservation of the Upper Cretaceous ammonoid Anagaudryceras limatum with corrugated shell in central Hokkaido, Japan
Fig. 1. Geological map of Cretaceous–Paleogene strata around Shuparo Lake in Oyubari area, central Hokkaido, Japan. Modified from Takashima et al. (2004).
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