Polished Ammonite Fossil Madagascar 362 g 4.75" x 4"

Polished Ammonite Fossil Madagascar  4.75" x 4" 362 g      Madagascar Ammonites are stunning fossilized marine creatures, dating back to the Jurassic and Cretaceous periods, approximately 65 to 400 million years ago. These fossils originate from the island of Madagascar, which is famous for its rich and well-preserved deposits of ammonite fossils. Geologically, ammonites belong to the class Cephalopoda, sharing ancestry with modern-day octopuses, squids, and nautiluses. Their intricate, spiral shells are composed of aragonite, a crystalline form of calcium carbonate, which has been beautifully preserved over millennia due to the island’s unique sedimentary conditions.     Madagascar's fossil deposits were formed during periods when the region was submerged under shallow seas, providing an ideal environment for the preservation of ammonites. Over time, tectonic shifts and erosion exposed these fossils, revealing not only their stunning aesthetic qualities but also their scientific impo