Massive (10 inch Wide) Mantelliceras Ammonite

This is a massive 10 inch in diameter ammonite of the genus Mantelliceras from Madagascar. This is not a type often seen for sale from this country. It's nearly 5 inches wide at it's widest point, very solid and weighs 15 pounds. It makes for a great display piece.

Mantelliceras a late Cretaceous ammonite characterized by a strongly ribbed, moderately involute shell with a moderately wide umbilicus, and rounded whorl section. It was collected in the Morondava Basin east of the town of Tulear.

Link to paper on these ammonites: https://geojournals.pgi.gov.pl/agp/article/view/10372/8883