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Cidaris Fossil sea Urchin Plate 130mm


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A good limestone trimmed slab encapsulating several echinoids exhibiting a mass mortality pattern, presumably smothered in some underwater calamity, evident in the scattered arrangement of spines around the fossilised sea urchin test's.

Class: Echinoidea
Subclass: Euechinoidea
Order: Hemicidaroida
Genus: Acrosalenia hemicidaroides. Echinoidea, Agassiz, 1838
Age: Mesozoic era, middle Jurassic, Bathonian stage approximately 168 to 166 million years.
Origin: Oolitic layers, Landaville, Vosges, Lorraine, North Eastern France.

Echinoid measurements.
Diameter: 2.0 - 2.5 cm

Cidaris Echinoid plate measurements.
Square: 13.0 cm
Depth: 3.0 cm

Approximate weight: 1,137 g

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An Oolitic Hemicidaris echinoid slab exhibiting rounded and inflated tests of a rare quality hemicidaris sea urchin fossil, discovered from an excellent fossil layer of the region of voges, Lorraine in northeastern France.

Tubercules in double rows set in-between the interambulacra and ambulacrum, which is characterised by double rows of pores in tandem, these rows of orifices wave there way around the test in typical morphology.

Spines accompany the fossilised tests, these spines are long in comparison to the test, approximately 50 millimetres average, the tests are roughly 20 millimetres to 25 millimetres in diameter. The surrounding oolitic matrix crammed with star-shaped crinoidal ossicles, the remains of crinoid stem or stalks contemporary in age to the fossil echinoids.

The Bathonian stage was first scientifically noted by dOmalius dHalloy circa 1843 and the stage length identified by the French palaeontologist Alcide dOrbigny circa 1852. The global reference profile for the base of the Bathonian was ratified as Ravin du Bès, Bas-Auran area, Alpes de Haute Provence, France in 2009.