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Cleoniceras Ammonite Pair


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An excellent quality Cleoniceras ammonite which has been conserved, cut into two parts, both faces now polished perfectly flat, revealing the wonders of per-mineralisation which takes place over millions of years. Each chamber has been replaced with calcite, in the form of Quartz. this is created by hydro-thermal activity, this is usually associated with volcanism. Read the full description below...

Genus: Cleoniceras ammonite. 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.
Height: 16.5 cm
Width: 13.6 cm
Depth: 1.9 cm ( ammonite halves together 3.6cm)

Approximate weight: 0,880 g

This Cleoniceras ammonite includes two acrylic stands for display.

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A Cleoniceras ammonite precisely cut into two halves forming a matched pairing, these polished to a high standard, revealing the fascinating interior of shell growth, the chambers which over millennia have filled with naturally forming minerals of quartz, calcites and limestone fossil sediment from the seabed of the Cretaceous era. The colours to this fossil shell are particularly attractive, the last three chambers contains the sea bed sediment now metamorphosed into limestone. The remaining chambers of quartz spiralling and diminishing in size reflecting the growth of the ammonite from the smallest central chamber.

An excellent specimen extinct cephalopod phragmacone (exoskeleton, shell), as the soft tissues were broken down by bacteria, the remaining cavities filled with gases and sediments which under the perfect environment of pressure and temperature created the marvellous coloured minerals and crystal growth we see today.

Ammonites are part of the Ammonitida of marine invertebrates. These were fascinating creatures dwelling in shallow to mid depth oceans and believed to be aggressive creatures as squids of today. With large eyes and remarkable vision they hunted their prey at depths where little or no light penetrates the deep oceans. The Cephalopod using its long tentacles would locate prey much like extant squids and nautili Pompilius which can be found in the Pacific today.

Additional Information

Age Cretaceous
Origin Madagascar
Colour Brown