10 000 Francs CFA Ammonoidea

Ammonoidea became extinct at the end of the Cretaceous, roughly 66 million years ago, and their fossilized remains have been recovered on every continent including Antarctica. Burkina Faso has no coastline and no notable ammonite fossil sites — the subject matter is entirely disconnected from the issuing country, a common feature of the modern "fantasy bullion" market where landlocked or small-economy nations license their minting authority to European distributors targeting collector niches.

The kilogram format places this squarely in the investor-collector crossover segment that expanded sharply after 2008.