Brittle Star Mosasaur agate and other minerals over

agate and other minerals over the course of some 110 million years

Small: Width 8cm Height 6cm Depth 0

a type of shelled squid

Extra large: Width 16

Brittle Star Mosasaur agate and other minerals overOphiuroidea brittle stars. These prehistoric echinoderms are preserved on a gritty micaceous siltstone. Limonite, which is heavy in iron, gives the brittle stars their distinctive orange colour. Found in the Kataoua formation, Morocco. From the Upper Ordovician, circa 450 million years old. Minimum size Length 13cm Height 11cm Depth 3cm Measurements are approximate and the minimum size you should expect your item to be. Includes a small display stand.