£2,500 - £3,000
A good iridescent ammonite specimen (Placenticeras meeki) 75- to 72-million-years-old (Late Cretaceous) Bearpaw Formation, Alberta, Canada Well preserved and complete showing a wide range of the most vivid ammolite colouring. 15cm wide x 13cm (6in x 5in) Provenance:The property of Andrew Parker, lead researcher at the Natural History Museum, London. Acquired in Alberta, Canada. Footnote:'Ammolite' is the name given to the colourful and wonderful Ammonite fossils found in the famous Bear Paw Formation in Southern Alberta, Canada. Their shells underwent a unique fossilisation process over 75 million years. Exposure to pressure, temperature and geographic location caused the shell to mineralise into a rainbow of iridescent colours similar to opalisation. The specimens are mined on the Native American Black Foot reservation, who themselves operate and oversee the excavation. Since 1981 Ammolite has been recognised as a gemstone by the World Jewellery Confederation. The present specimen shows a high gloss coating, a strong play of red and green colours as well as areas of nacre to both sides.
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