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AN IRIDESCENT AMMONITE
AN IRIDESCENT AMMONITE
AN IRIDESCENT AMMONITE
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These lots have been imported from outside the EU … Read more
AN IRIDESCENT AMMONITE

CANADA

Details
AN IRIDESCENT AMMONITE
CANADA
the 17-inch specimen of Placenticeras costatum from the upper Cretaceous, Bearpaw formation (75-72 million years ago), showing strong iridescence of red, orange and green yellows to both sides.
17in. (45cm.) wide
Special notice

These lots have been imported from outside the EU for sale using a Temporary Import regime. Import VAT is payable (at 5%) on the Hammer price. VAT is also payable (at 20%) on the buyer’s Premium on a VAT inclusive basis. When a buyer of such a lot has registered an EU address but wishes to export the lot or complete the import into another EU country, he must advise Christie's immediately after the auction.

Lot Essay

The opal like iridescence of these ammonites from Alberta, Canada has been termed ammolite and since 1981 has had the status of a gemstone. The shimmering, metallic colours were caused by the combination of millions of years of compression and the mineralization of iron, copper and silica which precipitated from volcanic ash. The opalescent layers of colour are particularly prized in the Chinese philosophical system of Feng-Shui.

The ammonites are a group of molluscs that lived in the seas from the mid-Devonian (approximately 400 million years ago) to the end of the Cretaceous (65 Million years ago). The sequence of events that famously killed off the dinosaurs also drove the ammonites to extinction

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