3.1" Jurassic Cut & Polished Ammonite Fossil (Half) - Madagascar

This is a 3.1" cut and polished Jurassic-aged ammonite fossil collected in the Tulear Province of Madagascar. Most of the cut and polished ammonites that you see from Madagascar are Cretaceous in age, but those with orange/yellow/pink coloration are Late Jurassic (Oxfordian Stage) in age, nearly 50 million years older. There are a number of species/genus of Phylloceratida ammonites from this location which look very similar, this one appears to be Ptychophylloceras.

The previously hollow chambers of the ammonite were replaced with a beautiful agate during the fossilization process. Some of these chambers are still partially hollow and lined with druzy crystals. The ammonite was cut in half and polished revealing the inner chamber structure of this ancient marine animal. The pictured half is included and is accompanied by a display stand.