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Cleoniceras Ammonite Pair on Bronze 241mm


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Exceptional quality Cleoniceras ammonite cut into two parts on surmounted bronze base to a museum standard exhibit. Post conservation and preparation now revealing the wonders of mineralisation of the localised fossil quartz and Jaspers contained within the earth in Madagascar. Read the full description below...

Genus: Cleoniceras ammonite, Hoplitidae.
Age: Albian stage, 100 to 113 m.y.a.
Period: Cretaceous period, 135 to 65 m.y.a.
Origin: N.E. Madagascar. E.Africa, South Indian Ocean

Overall measurements.
Height: 24.1 cm
Width: 18.3 cm
Depth: 6.5 cm

Approximate total weight: 2,040 Kg

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The absorption of the local environment’s mineral wealth has created the anomaly of fossilisation of the once living cephalopods phragmocone (shell). The ammonites phragmocone, similar to the modern day nautili phragmocones, through a process of osmosis has enabled minerals to transform the interior of the chambers. Crystal's develop through a process of per-mineralisation, any mineral rich water coursing through the fossil bed at the time of deposition of any animal, in this case the ammonite, allows the ammonites tissues, cell by cell to be transformed. Each cell hardens and by an osmosis process the minerals replace the once living tissue, petrifying the animal, bones or in this case exoskeleton, the phragmocone. The mineral rich solution leaving behind deposits of minerals, this enables the quartz, in this instance, to develop and grow filling the phragmocone cavities. The process takes place over long periods of time and eventually fossilising over millions of years while the metamorphism of the animal into fossil unfolds.

Bronze surmounted Cleoniceras ammonite which has been unearthed from Madagascar's fossil layers and created into the sublimely classical sculpture by the fossil store team. The specimen ammonite precisely cut in half, conserved, prepared and finely polished. This process is technically demanding process requiring skill from the technician to achieve the high standard when finally presented to this quality. the surmounted bronzed based designed and produced in the United Kingdom.

Revealing the wonders of mineralisation which takes place over millions of years. Each chamber has been replaced with quartz in the form of calcites and coloured jaspers, minerals that once formed the sea bottom muds and surrounded the invertebrates phragmocone (shell), when covered over in the Cretaceous silts. These contained minerals which created the colours now preserved and which can be viewed millions of years later.

Ammonites are part of the Ammonitida of marine invertebrates. These were fascinating creatures from the deep oceans and believed to be similarly aggressive creatures as giant squids of today. With extremely large eyes and remarkable vision hunting down prey at great depths, where little light penetrated the ocean. The Cephalopod would grasp its prey using long tentacles, much as the modern day Nautilus Pompilius which can still be found extant in the modern day Pacific Ocean.