4.8" Polished Slab Petoskey Stone Hexagonaria Coral Fossil Devonian Age Michigan Sardonyx A notable variety of andalucite

A notable variety of andalucite is chiastolite

This unusual dental pattern indicates they likely employed a different feeding technique compared to other plesiosaurs

These fossil beds were first described by the Greek historian Herodotus

and occasionally insects

4.8" Polished Slab Petoskey Stone Hexagonaria Coral Fossil Devonian Age Michigan Sardonyx A notable variety of andaluciteLocation: Michigan, United States Weight: 3. 3 Ounces Dimensions: 4. 8 Inches Long, 2. 3 Inches Wide, 0. 4 Inches Thick The item pictured is the one you will receive. Devonian Age, 350 million years old Petoskey Stone is a unique rock and fossil, specifically a fossilized rugose coral known as Hexagonaria percarinata. These stones are typically pebble shaped and are found primarily in the northwestern and northeastern regions of Michigan's Lower