Ammonite Fossil - Sliced Polished Ammonite Pair - 4-1/2"
Ammonites lived 240 to 65 million years ago. These predatory cephalopods had a spiral shell with tentacles and utilized air trapped in their shells to adjust their buoyancy. Its closest living relative is the octopus, squid or cuttlefish, not the nautilus as one might think. They possessed an external shell divided internally by chambers, called septa, that held trapped air used to adjust buoyancy. As the animal grew, it would move forward creating new septa behind it. Narrow, wavy lines suture lines formed where the septa came into contact with the outer shell. The pattern of the line is used to distinguish species of fossilized cephalopods.
This particular species, Cleoniceras besairiei, created an oak-leaf patterned suture still evident in the fossil today. The fossils are mined and polished to create a stunning, glossy surface that allows the fossil's natural colors and minerals to shine through. Our specimens are from Madagascar.
This sliced ammonite pair measures just over 4-1/2" across (along the longest edge). This specimen features a vibrant pearlescent shell enamel called ammolite, an opal-like gemstone. In the areas where the enamel flaked away, you can view the amazing oak-leaf suture pattern the animal created as it grew. On the inside, you can view each chamber and the suture lines. This piece features beautiful olive green and caramel brown minerals, with a few crystalized chambers. A true work of art, this natural fossil specimen makes for a great display piece at home or the office.
You are purchasing this exact specimen, the full pair. With your purchase, we will provide you with a small identification slip to keep with your specimen.