22077 - Great Collection of 3 OPHIURA SP Brittlestar Upper Ordovician Ktaoua Fm Onchopristis teeth collections Although it has commonly been

Although it has commonly been assumed that concretions grew incrementally from the inside outwards

the United Kingdom (19)

The bones have some fractures that have been glued and restored by the filling method

vanadinite crystals from Midelt

22077 - Great Collection of 3 OPHIURA SP Brittlestar Upper Ordovician Ktaoua Fm Onchopristis teeth collections Although it has commonly beenBeautiful collection of 3 specimens of Ophiura. This type of brittlestar is quite representative of the Ordovician of the South of Morocco. Its orange colors come from the limonite (iron oxide) that is the product of the oxidation of the original pyrite that mineralized these fossils.