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Belemnites sp.

Shimo-Ono, Ono city, Fukui pref., Japan

early-middle Tithonian, Late Jurassic, Mesozoic (150 Ma)


Length: 100 mm. Belemnite fossil, the back bone of squid. Concoidal growth lines are clearly observed. Recovered from siltstone of the early-middle Tithonian (Late Jurassic, 150 Ma) Kuzuryu Subgroup in the Tedori Group. The sedimentary environment of the Kuzuryu Subgroup is shallow marine. This outcrop has been thought as a part of the Bathonian-Callovian (Middle Jurassic, 165 Ma) Kaizara Formation, but recovered ammonoid fossils (Parapallasiceras sp.) suggests that it belongs to the Kurotodo Formation.

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