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Cidaris Echinoid Fossil Sea Urchin 35mm


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An excellent example of a fossilised prehistoric sea urchin Test (once the shell animals hard parts) exhibiting the detailed surface as described below.

Genus: Cidaris echinoid specimen.
Age: Mesozoic era, middle to upper Jurassic, approximately 170,000,000 - 150,000,000 years.
Origin: Agadir-Ida Ou Tanane Prefecture, Atlas Range, Morocco, North Africa.

Cidaris Echinoid measurements.
Diameter: 3.5 cm
Height: 2.0 cm

Approximate weight: 0,036 g

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A robust inflated test (shell) of the Cidaris echinoid exhibiting what once lay beneath the matrix (fossil sediments) of the fossil layer, some matrix still adhered to the cidaris test. The ambulacral areas and some tubercules can be seen. A good study display piece or fossil curiosity sea urchin. The sediment is notoriously difficult to remove and most only possible with preparatory tools and acid, at an advanced level of preparatory skill.