A highly sutured and mineral chambered Cleoniceras ammonite, the saddle having been relieved of Cretaceous period matrix exposing the saddle formation of the ammonite, this has also exposed the suture lines which create the frilly edge around the saddle and mouth aperture, a spectacular hand selected specimen from Madagascar.
These extinct cephalopods part of the ammonoid group and similar to squids, cuttlefish and octopi of today. This particular specimen fossil Cleoniceras exhibits the fine divisions of the cephalopods septa, chamber wall or divisions. Naturally formed here as lighter and darker coloured wavy chamber septa over the honey and treacle colour mineral infill. The sutures are found at the point of divisions of growth, as the ammonite added each new chamber or septa wall a larger suture stage developed. The frilly sutures were the points of attachment of the septa, separating each chamber of the mollusc In the last chamber, the soft body of the mollusc dwelled.
The septa sutures were attached to the inner shell and have left the patterning which is a remarkable event in the natural history of the cephalopod. Once polished the attractive markings become apparent if the fossil has preserved well, many times this is not the case. Beautiful examples are rare, many more ammonites are not so attractively marked.
The sutured chambers are filled with minerals, often quartz, calcites and jaspers which are all semi-precious minerals of the mineral kingdom. The fossilised shell itself has a good three dimensional or inflated shape and is of a good size for the type. A recommended investment ammonite.
The amazingly striking and natural suture patterning is clearly exhibited in the fossil depositions of Cleoniceras ammonites from Madagascar, here in these specimens the ammonitic sutures create a dramatic patterning once the shell has been stripped away, this contrasts with the fine ammonitic linea calcite pattern laid through a honey calcite colour infill, the infill's are minerals which were deposited within the shell chamber cavities millions of years ago. Read the full description below...
Genus: Cleoniceras ammonite, family Hoplitidae.
Age: Albian 100 to 113 m.y.a., Cretaceous period 135 to 65 m.y.a
Origin: N.E. Madagascar. E.Africa, South Indian Ocean
Cleoniceras ammonite measurements.
Diameter: 16.0 cm
Weight: 0,718 g