Name: A FINE IRIDESCENT AMMONITE
Brand: CANADA
Price: 20000.00 GBP
Availability: OutOfStock

From the Upper Cretaceous, Bearpaw formation (75-72 million years ago), the 16¹⁄₄-inch specimen of Placenticeras meeki displaying a dazzling iridescence of reds and oranges, greens and rich blues.
16¹⁄₄ x 12¹⁄₂ x 1¹⁄₄in. (41.5 x 32 x 3.5cm.)

This lot will be removed to Christie’s Park Royal. Christie’s will inform you if the lot has been sent offsite. Our removal and storage of the lot is subject to the terms and conditions of storage which can be found at Christies.com/storage and our fees for storage are set out in the table below - these will apply whether the lot remains with Christie’s or is removed elsewhere. Please call Christie’s Client Service 24 hours in advance to book a collection time at Christie’s Park Royal. All collections from Christie’s Park Royal will be by pre-booked appointment only. Tel: +44 (0)20 7839 9060 Email: cscollectionsuk@christies.com. If the lot remains at Christie’s it will be available for collection on any working day 9.00 am to 5.00 pm. Lots are not available for collection at weekends.
Please note this lot is the property of a consumer. See H1 of the Conditions of Sale.

Conditions of Sale
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This lot is offered by Christie Manson & Woods Ltd

Brought to you by

James HyslopHead of Department, Science & Natural History

A Christie's specialist may contact you to discuss this lot or to notify you if the condition changes prior to the sale.

jhyslop@christies.com +44 (0) 20 7752 3205

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.

The present specimen is not only one of the largest examples to be offered by Christie's in recent years, its preserved shell also features extraordinary polychromy across the shell - especially blues and purples - that are usually found only as trace elements in similar specimens.