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 specimen measures just over 3-1/4" across. This piece features beautiful olive green, caramel brown, and muted yellow-green tones, with cream-colored suture lines, and large patches of fire opal. The opal in this specimen is quite spectacular! 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. With your purchase, we will provide you with a small identification slip to keep with your specimen.