Belle ammonite Sphenodiscus lenticularis ; Haut crétacé (70 millions d'années) Fox Hills formation, White River badlands, Sud dakota, U.S.A.

La coquille fossilisée de cette superbe ammonite  envoie mille et un feux, ce qui est une caractéristique de cette espèce. Nous pouvons observer un esthétique jeu de couleur où interviennent de beaux verts et rouges. La couche externe est composée d'ammolite, une matière reconnue internationalement comme une gemme précieuse. On pense  que  Sphenodiscus était  un nageur redoutable.  C'est  l'une des dernières ammonites à avoir connu une évolution avant l'extinction de masse de ces animaux à la fin de la période. La présentation rehausse encore l'éclat et l'intérêt de la pièce.

Perfect condition. coloured on both sides. Cracks visible on images are natural and won't budge with the times. Colours on images are natural and obtained with artificial lights (with natural light the ammonite has to be oriented on sevral positions to see all colours. The piece is sold with its showcase, its rotating base and its artificial lights.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."