Orthoceras and ammonite on display stand - Fossilised animal (No reserve price)

Beautiful display plate with several specimens of Orthoceras and of ammonite goniatite from Morocco. These marine animals were among the first living forms to inhabit the planet. Find spot: Arfoud area. Orthoceras are extinct cephalopod mollusks, belonging to a group that has disappeared. These marine creatures lived in the oceans several hundred million years ago, mainly during the Ordovician, Devonian, and Silurian periods. Their name, in Greek meaning “straight horn,” refers to the characteristic shape of their conical, elongated shell. This shell was divided into chambers, separated by septa, and traversed by a siphon. The Orthoceras shell is probably their most distinctive feature. It was made of aragonite, the mineral that also forms the shells of many current mollusks. Over time, and under the influence of geological processes such as sedimentation and mineralization, these shells fossilized, giving rise to the specimens we admire today. Orthoceras fossils are precious witnesses to marine life of a past era. Their study allows scientists to reconstruct ancient ecosystems, understand the evolution of species, and better comprehend the major changes that have marked Earth’s history. ***Display stand included***

估價:$1.12

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