特異な保存状態を示す白亜紀硬骨魚類化石について

概要

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A specimen of the eel-shaped Cretaceous teleost fish Dercetis elongatus AGASSIZ from the Middle Chalk is described. The specimen consists of a nearly complete articulated cranium and some articulated post-cranial remains. It is preserved as an external mould within a frost-shattered flint nodule. This well preserved specimen is only the thirteenth known and extends the range of the species, previously only recorded from the Middle Chalk of eastern England, to south-west Britain. The taphonomy is unusual as vertebrate remains are rarely preserved in flint nodules.