21161 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Shark The entire mandible and cranial

The entire mandible and cranial remains of this mosasaur species are extremely rare

Rare rooted specimen

Trilobita - Corynexochida

such as the distinctive chisel shape of this sauropod

It is still preserved included in part of the sandy-gravel sediment that is cemented and mineralized to its surface

21161 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Shark The entire mandible and cranialXiphosurans 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