North Africa, Anti Atlas Mountains, Ktaoua formation, Ordovician, ca. 488 to 443 million years ago. A rare and concentrated natural stone matrix of starfish and crinoids (sea lilies) that died and fossilized together. This was once part of the prehistoric ocean floor, but professionally excavated and prepared, and each fossil is extremely three-dimensional, retaining their lifelike appearance, most show overlapping anatomy and multi-layer orientations. The matrix is all natural, only prepared to reveal the fossils; they are not arranged or composites of multiple pieces! This collection of ancient sea life is large and unforgettable; a visually impacting specimen of a mass extinction of various co-existing echinoderm forms. For the ultimate commercial or residential interior design application or for a public museum exhibit, this is the finest scientific grade showing of a rare and intriguing example of some of the earliest complex marine creatures on our planet. Sizes of star fish: 4.5" L (11.4 cm) to 5" L (12.7 cm); matrix: 26" L x 16" W (66 cm x 40.6 cm)
Despite this plant-like appearance and name "sea lily," crinoids are sea creatures that are related to starfish and sea urchins. These crinoids are of the form that attached themselves to the sea floor using a long stalk or anchor, which you can see preserved in several of the examples here. In life, these crinoids had a mouth on their top surface surrounded by feeding arms, giving them a waving, moving effect even here, frozen in stone. Many species of crinoids continue to live today, but during the Silurian period, they were much more abundant - the Silurian saw an explosion of life in the sea, and these animals would have been vibrant parts of that newly diverse ecosystem, probably brightly colored if modern sea lilies are anything to go by. Complete star fish are a rare occurrence in the fossil record, due to their skeletal composition that separates during decomposition. Dating back to nearly a half a billion years ago during the Ordovician Period, this amazing natural group fossil presents a mass extinction event! During this era, about 100 times as many meteorites struck the Earth per year, compared with today, and 2 such collisions in the Devonian and Permian and caused the demise of many echinoderm species, but some crinoids and starfish survived and rapidly diversified in a short span of 60 million years!
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Provenance: ex-private French collection
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#167896
Condition
Minor repairs but no restoration. Natural group found as shown with no assembly!