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Ammonitida - Hoplitidae

Opal Desmoceras Ammonite 92mm

£782.00 GBP

A double opalescent Desmoceras ammonite measuring 92mm in diameter, excavated from the Mahajanga jungle of Madagascar. This exotic tropical island placed off the coast of Sout East Africa is a hidden jewel in the Indian Ocean for specimens such as this Desmoceras and Cleoniceras ammonites, with some of the most unique flora and fauna discovered within these unique fossil deposits display a vivid array of colours thanks to the mineral deposits, allowing such preservation such as the opalescent iridescent lustres found within the nacre of the shell. These richly detailed fossil specimens are mainly quartz-based that have developed within the earth's layers which create these unique depositions, some found close to the surface and many have to be processed through mining.

Prepared using micro pneumatic hand-held machinery to remove the surrounding matrix/bedrock, scientifically and aesthetically revealing the ammonite to the center. Displays an attractive array of vivid colours which reflect at all angles from bright blues, glaucous greens and striking vivid highlights of scarlet reds transitioning through to the keel of this Desmoceras ammonite.

Rare colours found in specimens are maize yellow, amber, blue, glaucous, cerulean, purple, lavender, scarlet red, coral pink and lavender-pink. To find the best Cleoniceras specimen for your collection, friend or loved one, you should start looking at the aesthetics. Make sure it is symmetrical, look for flaws on the shells surface, usually, these will develop as chips or even filler, large specimens are prone to these anomalies, sometimes these are badly prepared or of a very low grade. Next to the colouration, is it vibrant, does it reflect in low light, getting the best out of a fairly dull specimen, angled photographs in dark light using florescent lights can achieve sellers desired perspective. One needs to see consistency when looking to buy online and make sure the photographer has caught true reflections of light using standard white lights. In our photography, no flash is used therefore one can gain a true likeness of how the ammonite displays and will display in your collection.

Ammonites are part of the Ammonitida of marine invertebrates. These were fascinating creatures from the deep oceans and believed to be aggressive creatures like squids today. With extremely large eyes and remarkable vision, they could easily hunt on their prey at great depths where little or no light penetrates the deep oceans. The Cephalopod would attain its prey using their long tentacles, prey such as other crustaceans and fish, much as the persisting modern-day Nautilus Pompilius which can be found in the Pacific today.

Some cephalopod facts; Off the Great Barrier Reef at depths between 200 to 400 meters, sightings of the Nautilus Pompilius were made, showing the pressures these Cephalopods can attain. The Ammonites fell into decline and began there own extinction around 70 million years ago, preceding a mass extinction event, at the end of the Cretaceous period, around 65 million years, the ammonites were extinct. One of the main differences separating the Nautiloids from the ammonites is a shield-like aptychi, plural aptychus, very occasionally found in the living chambers of fossilised ammonites. In fact, there are two pairs of these shield-like covers the aptychus and anaptychus. These look very much like the valves of a bivalve shell. These aptichus are not found in fossils after the Cretaceous extinction event, yet are found in the fossil ammonites from the Devonian Period, therefore the ammonites completely died out after the Cretaceous KT boundary event. The aptychi were thought to be a cover for the last living chamber. Made of calcite rather than aragonite, the later the substance from which the shell is made. Aptychi has been hotly debated as being either cover for the mandibles of the ammonite or a cover for the last living chamber, the argument is still out on exactly what the use of the aptychi was. Ammonites are important index fossils, it is often possible to link the sediment layer in which they are found to specific geological time periods. The largest ammonite to date is around 2.5 meters in diameter from Germany.

Genus: Desmoceras ammonite.
Age: Cretaceous, approximately 120 million years ago.
Origin: Mahajanga Jungle, Madagascar.

Desmoceras measurements.
Height: 7.91 cm
Width: 9.25 cm
Depth: 3.83 cm

Weight: 0.297 g

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If you need assistance regarding this product, we are here to help. Simply note the product 'TITLE + SKU' number within you enquiry.

Call us: +44 [0] 151 342 1151
Email us: info@thefossilstore.com

 

CONTACT FORM >

✓ Free UK Delivery

Free standard UK delivery - Recorded/Signed-for

All UK orders include free delivery, excluding Ireland, Scotland and the Highlands.

✓ Worldwide Delivery

This product is available for worldwide delivery.

✓ Authenticity Guaranteed

A certificate of authenticity is included with this product.

✓ Specify Delivery Date

For specific delivery dates please email info@thefossilstore.com or you can use our Contact Form.

Large items require special courier services - please allow time for such deliveries whilst we guarantee a more secure delivery of your order.

Once confirmed you will receive updates from one of our couriers for a door to door service - assigning your order to DPD Precise, Simon Haul Specialists or an alternate courier of our choosing.

Next Day Delivery is subject to availability, determined by the time of your order and product selection.

Please note - UK small orders arrive 3 - 5 business days.
UK large orders arrive 5 - 12 business days.

For Returns please see our Returns Policy.

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