07316 - Extremely Beautiful 3.35 Inch Brazilian Agate Slice (Chalcedony Geode Section) Halisaurus arambourgi Leonaspis is a widespread genus

Leonaspis is a widespread genus of odontopleurid trilobite that lived from the Late Ordovician to the late Middle Devonian

but not quite as large as Spinosaurus

which is in a Cenomanian terrestrial claystone in the Ifezouane Formation of Morocco

In order to classify them it would be necessary to cut off a section for analysis

Impressive specimen with the natural association of 2 brittlestars of the genus Ophiura

07316 - Extremely Beautiful 3.35 Inch Brazilian Agate Slice (Chalcedony Geode Section) Halisaurus arambourgi Leonaspis is a widespread genusAgate is a rock consisting primarily of cryptocrystalline silica, chiefly chalcedony, alternating with microgranular quartz. It is characterized by its fineness of grain and variety of color. Although agates may be found in various kinds of host rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks. This beautiful large polished agate slices comes from southern Brazil. The stone has been soaked in a