Brittle Star Mosasaur off-white limestone ammonites of the

off-white limestone ammonites of the species Acanthoceras

grey-silver form

as well as the chambered front side

a type of shelled squid

Brittle Star Mosasaur off-white limestone ammonites of theOphiuroidea 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.