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The petrified forests of the Western United States are silicified wood in which the tree tissue has been replaced by chalcedony (cryptocrystalline quartz)
Description: Araucarioxylon arizonicum cut in cross-section and polished to show the rich colors that are so famous for this location
Additional information: In 1905
Description: Dating from the Triassic period (approximately 220 million years old)
Montierte Ammoniten Kranaosphinctes (Pachyplanulites | Madagaskar Rock Cristal Ball The petrified forests of theOrigin: Madagascar Size: H44cm W42cm D16. 5cm Weight: 18. 35 kg Description: An Ammonite fossil mounted on a handmade bespoke stand highlighting the ammonite's distinctive spiral form. This is an unusually large ammonite. Additional Information: Ammonites were armoured cephalopods that died out around 66 million years ago. Fossils of them are found all over the world. All ammonites had a chambered shell which they used to regulate their buoyancy.
