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Kaizara, Ono city, Fukui pref., Japan

Bathonian-Callovian, Middle Jurassic, Mesozoic (165 Ma)


Width: 10 mm. Small ammonoid fossil recovered from shale of the Bathonian-Callovian (Middle Jurassic, 165 Ma) Kaizara Formation, the upper part of the Middle Jurassic (150 Ma) Kuzuryu Subgroup in the Tedori Group. The sedimentary environment of the Kuzuryu Subgroup is shallow marine.

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