21170 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Dinosaur Schreibersite abundant occurring as cm-sized

Schreibersite abundant occurring as cm-sized skeletal crystals at the centers of kamacite crystals

niobium and copper

Trilobita - Asaphida - Cyclopygidae

New Zealand

freshwater limpets

21170 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Dinosaur Schreibersite abundant occurring as cm-sizedXiphosurans are an order of arthropods related to arachnids, or, according to one recent study, actually arachnids. They are sometimes called horseshoe crabs (a name applied more specifically to the only extant family, Limulidae). They first appeared in the Tremadocian (Lower Ordovician) from Fezouata Fm in South Morocco. Currently, there are only four living species. They are members of the order Xiphosura, which contains two suborders, Xiphosurida