86MM Perisphinctes Ammonite Fossil Nautilus Madagascar Jurassic Age COA
Location: Near Sakaraha, Tulear Province, Madagascar
Weight: 6.6 Ounces
Dimension: 86MM - 3.4 Inches Long, 3 Inches Wide, 0.9 Inches Thick
Comes with a Certificate of Authenticity.
The items pictured are the ones you will receive.
Perisphinctes Ammonite
Perisphinctes ammonite from Madagascar captures a pivotal chapter in marine evolutionary history. These cephalopods dominated oceanic environments for over 170 million years, from the Devonian through the Cretaceous period, before succumbing to the same extinction event that eliminated dinosaurs. The Perisphinctes genus, distinguished by its finely ribbed shell architecture and tightly coiled geometry, represents a successful adaptive radiation within Ammonoidea. As active predators and swimmers, ammonites occupied critical ecological roles analogous to modern cephalopods—squid, octopuses, cuttlefish, and nautiluses. The specimen's nomenclature derives from Ammon, the Egyptian deity whose curved horns paralleled the shell's helical structure. Includes certificate of authenticity.
