55MM Pygurus Marmonti Sea Urchin Fossil Sand Dollar Jurassic Age Madagascar

Location: Majanga, Madagascar

Weight: 2.5 Ounces

Dimensions: 55MM

The item pictured is the one you will receive.

The Pygurus marmonti Sand Dollar, commonly known as a fossil sea urchin, is a striking echinoid fossil dating back to the Jurassic Period, approximately 145–200 million years ago. This ancient marine invertebrate is easily recognized by its distinctive five-pointed star pattern, a feature that reflects the intricate internal structure and natural symmetry of the species. Highly sought-after specimens from Madagascar are often naturally polished over time or gently refined to reveal exceptional detail and clarity, making them popular among fossil collectors and enthusiasts.

When alive, Pygurus marmonti inhabited shallow marine environments, where it burrowed into soft ocean sediments for protection and feeding. After death, the hard shell—known as the test—was buried beneath layers of sediment, gradually undergoing fossilization through mineral replacement and compression. This natural process preserved the delicate surface details and iconic star-shaped pattern that define Jurassic echinoid fossils today.

As both a scientifically significant specimen and a visually beautiful natural artifact, the Pygurus marmonti fossil sand dollar offers a rare glimpse into prehistoric ocean ecosystems and remains a prized addition to fossil collections, educational displays, and decorative presentations.

Please be aware of the nature of fossils:

Being buried under the ground for millions of years under tons of pressure tends to be rough. No fossil comes out of the ground whole and perfect. Most fossils have undergone some restoration, while others are altered by man simply to enhance their presentation in different ways. The workers in Madagascar do a very professional job of unearthing and preserving these natural treasures; however, natural cracks are visible on the surface. These are part of the natural beauty of the fossil and are not considered defects.