Description:

年代(Age): Cretaceous 83-66 Ma。 尺寸(Size): 26×19×2.5 cm。 描述 Description:Placenticeras sp. is renowned for its mesmerizing iridescence and rarity, having been buried within oil shale layers. Due to the pressure exerted by the strata, finding a complete specimen is exceedingly rare. Its outer shell is composed of aragonite, which produces diffraction effects under light, displaying a spectrum of rainbow hues. This exceptionally unique Placenticeras sp. holds even greater historical and biological significance—it bears distinct bite marks from a Mosasaur, one of the apex marine predators of its time. The preservation of such clear predatory traces not only attests to the survival challenges once faced by ammonites but also provides paleontologists with invaluable insights into predator-prey interactions in the ancient oceans. Like a frozen epic, it vividly captures the grandeur and brutality of marine life from approximately 75 million years ago.

  • Provenance: Origin:Alberta, Canada。 產地:加拿大 亞伯達省 。

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