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Lot 151
AN IRIDESCENT AMMONITE
SOUTH DAKOTA, USA
Fermé21 April 2016
Prix réalisé
GBP 11,250
Plus d'informations
Note du spécialiste
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 animals that lived in the seas from the mid-Devonian (approximately 400 million years ago) to the end of the Cretaceous. The sequence of events that famously killed off the dinosaurs also drove the ammonites to extinction.
The ammonites are a group of animals that lived in the seas from the mid-Devonian (approximately 400 million years ago) to the end of the Cretaceous. The sequence of events that famously killed off the dinosaurs also drove the ammonites to extinction.