Mined from: Mahajanga Province, Madagascar

Era: Mid-Cretaceous, Mesozoic
Geological Age: 100 to 113 mya

Description: This polished Douvilleiceras ammonite from Madagascar shows the strong ribbing and broad spiral form that make this genus so recognizable. The cut and polished face reveals the internal chamber structure of the shell, turning what was once a living marine animal into a cross-section of ancient geometry. Pieces like this often show a mix of earthy matrix, natural fossil texture, and subtle mineral contrast that gives each specimen a distinct look.

Douvilleiceras was a fast-swimming ammonite that lived in warm Cretaceous seas while dinosaurs still dominated the land. Ammonites were cephalopods, related to modern nautilus, squid, and octopus, but their coiled shells were divided into chambers that helped control buoyancy in the water. Madagascar is well known for producing polished ammonites from marine sedimentary deposits, where buried shells were preserved and later exposed through erosion and quarrying. A polished cut face makes that history easy to see, showing both the animal’s architecture and the long fossilization process that preserved it for over 100 million years.

Ammonite fossils are often associated with change, motion, and the long cycles of nature. Many people are drawn to them as symbols of evolution, persistence, and steady progress through time. A Douvilleiceras specimen in particular has a strong, structured presence, and is often chosen by collectors who like fossils that feel grounding, ancient, and full of visible history.

Mini
Approximate Size of 1 piece: 35mm x 30mm x 18mm
Approximate Weight of 1 piece: 21g

Small
Approximate Size of 1 piece: 41mm x 30mm x 20mm
Approximate Weight of 1 piece: 31g

Medium
Approximate Size of 1 piece: 44mm x 35mm x 22mm
Approximate Weight of 1 piece: 37g

Large
Approximate Size of 1 piece: 56mm x 44mm x 28mm
Approximate Weight of 1 piece: 79g

XL
Approximate Size of 1 piece: 60mm x 48mm x 30mm
Approximate Weight of 1 piece: 95g

XXL
Approximate Size of 1 piece: 80mm x 62mm x 44mm
Approximate Weight of 1 piece: 236g

XXXL
Approximate Size of 1 piece: 84mm x 65mm x 48mm
Approximate Weight of 1 piece: 252g

4XL
Approximate Size of 1 piece: 110mm x 100mm x 57mm
Approximate Weight of 1 piece: 518g

Quantity: 1pc

With this product, you will get the actual stone in the photograph. We do what we can to buy good quality products and price them honestly. The rocks may differ from the photos, but we hope we do them justice.