As the ancient super-continent Gondwana broke up in the mid-Jurassic period, Madagascar was wrenched from eastern Africa. The mini-continent thus formed included present day Madagascar and India existing until about 88 million years ago when India split off and began rapidly drifting to a collision with Asia. Madagascar remained attached to Africa, a chunk of ancient Gondwana preserved to the present day.
The rifting between Africa and Madagascar created three major sedimentary basins in western Madagascar, from north to south, the Ambilobe, Mahajanga, and Morondava.  Marine deposition began in the Middle Jurassic; major fossil deposits of Tithonian age exist and have been amply described by M. Collignon and others.  By the Lower Cretaceous Epoch, rifting ended and a passive margin with intermittent cyclic marine conditions continued through the end of the Cretaceous with marine inundation persisting into the Neogene Period.
The sedimentary deposits of the three basins contain a treasure trove of fossils, the most recognizable being the many ammonite families.  Ammonite species evolved quickly becoming widespread in a brief geologic timespan, then could just as quickly fade from the scene.
The ammonite fossils we offer for sale lived in the warm shallows of the Jurassic and Cretaceous sea that lapped the western shores of that long lost island continent.  Here are beautiful fossilized examples of Upper Cretaceous fossil ammonites presently coming from Madirovalo and Jurassic ammonites from Tulear, Madagascar.
All the Madagascar ammonite fossils we offer have been polished or otherwise altered from their "as found" state.  The reason is simple, Madagascar law makes it illegal to export un processed fossils.  We assume this is a worthy measure to provide jobs for the Malagasay from the island's natural resources.