Orbicular Granite Sphere White base Trilobites are a group of

Trilobites are a group of extinct marine arthropods that first appeared around 521 million years ago

Each is made from glass and has a concave backing

A bit about ammonites:

these beetles are literally "going stag

The orbicules are formed by crystallisation from a fluid-rich supercooled dioritic magma nucleated on seed crystals

Orbicular Granite Sphere White base Trilobites are a group ofStand sold separately Orbicular granite is a rare type of igneous rock characterized by its distinctive appearance. It is composed of concentrically layered, spheroidal structures called orbicules, which are typically made up of alternating bands of dark and light minerals. Orbicules can range in size from a few centimeters to several meters in diameter. The orbicules are formed by crystallisation from a fluid rich supercooled dioritic magma nucleated