From the Upper Cretaceous, Bearpaw formation (75-72 million years ago), the 5 & 15-inch specimens of Placenticeras meeki displaying a dazzling iridescence of reds and oranges, greens and rich to the front, the reverse with further yellows blues, and to the smaller ammonite even rare purple iridescence.
15 x 13 x 212in. (38 x 33 x 6cm.)

Special notice
Specified lots are being stored at Crozier Park Royal (details below) or will be removed from Christie’s, 8 King Street, London, SW1Y 6QT by 5.00pm on the day of the sale. Christie’s will inform you if the lot has been sent offsite. If the lot has been transferred to Crozier Park Royal, it will be available for collection from 12.00pm on the second business day following the sale. Please call Christie’s Client Service 24 hours in advance to book a collection time at Crozier Park Royal. All collections from Crozier Park Royal will be by pre-booked appointment only. Tel: +44 (0)20 7839 9060 Email: If the lot remains at Christie’s, 8 King Street, it will be available for collection on any working day (not weekends) from 9.00am to 5.00pm
Brought to you by

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.

Related Articles

More from
Science and Natural History
Place your bid Condition report

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

I confirm that I have read this Important Notice regarding Condition Reports and agree to its terms. View Condition Report