• Douvilleiceras Ammonite from Madagascar 112 Million years old


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    Douvilleiceras Ammonite from Madagascar. Measures at 2 1/4 x 2 1/4, 1/2 thickness.

    Description: This spectacular ammonite is a Douvilleiceras mammillatum from Madagascar which has been polished to show the wonderful amber Calcite just below the outer shell. The intricate suturing pattern which provided strength to the ammonite is well evident. Note as well the linear structure evident at the midline. This is the siphuncule, an integral part of the ammonite’s “ballast system”. The ammonite moved freely at depth by pumping water in an out by means of the siphuncule. There is a small amount of residual pearlescent shell remaining on the reverse. It is a stunning example of an ammonite from the Albian (112 m.y.a) deposits of Madagascar, one that is sure to be the centerpiece of any ammonite collection.This Ammonite has a natural sculptural form with well defined lobes and saddles.

    Ammonites were ancient marine creatures related to the squid, octopus, and cuttlefish. They get their name from the ram-horned Egyptian God Ammon. This ammonite features well defined ribs and chambers, and spiral shell. The fascinating spiral shape is due to the animal adding a chamber as it grew. The later chambers are noticeably bunched, that is the septa, and the walls dividing the shell into chambers are closer than the rest of the shell.