06859 - Top Beautiful 4.49 Inch Quartz Crystals - Imilchil (Morocco) Primitive arthropods Undoubtedly

Undoubtedly

Aglaspidida

phosphates of the Oulad Abdoun Basin

schreibersite Fe=58

The rostrum most likely would have had electrosensors to detect food in the water below them like most modern sharks and some rays

06859 - Top Beautiful 4.49 Inch Quartz Crystals - Imilchil (Morocco) Primitive arthropods UndoubtedlyTop beautiful huge crystallized specimen. Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 siliconoxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.