MADAGASCAN CLEONICERAS SUTURED AMMONITES
A highly sutured and mineral infilled chambered Cleoniceras ammonite, 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. These septa sutures were attached to the inner shell leaving behind in postmortem the patterning which is a fascinating evolvement of the morphology of 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, and numerous ammonites are often not so attractively marked in this way. The sutured chambers filled with minerals during the fossilisation period, often this was 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.
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The natural suture patterning is a vivid illustration of the development of the once living mollusc and creates an excellent and beautiful contrast of the honey calcite colour set between the frilly sutures consisting of cream to darker outlines which appear to give a contrasting light and shading to the polished faces of the ancient mineralised shell. A desirable Cleoniceras fossil ammonite from a renowned palaeontological collecting zone location, Madagascar.
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