![Royal Tyrrell Museum of Palaeontology on X: "Ammonites have a unique form of preservation in southwestern Alberta. Tectonic pressure, heat, and mineralization over millions of years compressed these shells into colourful, iridescent Royal Tyrrell Museum of Palaeontology on X: "Ammonites have a unique form of preservation in southwestern Alberta. Tectonic pressure, heat, and mineralization over millions of years compressed these shells into colourful, iridescent](https://pbs.twimg.com/media/EE1YXPnXUAEkvfJ.jpg:large)
Royal Tyrrell Museum of Palaeontology on X: "Ammonites have a unique form of preservation in southwestern Alberta. Tectonic pressure, heat, and mineralization over millions of years compressed these shells into colourful, iridescent
![Rainbow ammolite ammonite shell on display at the American Museum of Natural History [1400x942] : r/FossilPorn Rainbow ammolite ammonite shell on display at the American Museum of Natural History [1400x942] : r/FossilPorn](http://upload.wikimedia.org/wikipedia/commons/8/8e/Iridescent_Ammonite_Fossil.jpg)
Rainbow ammolite ammonite shell on display at the American Museum of Natural History [1400x942] : r/FossilPorn
![Rainbow Fossil Ammolite Gem Quality Ammonite Collectible Fossil, Includes Display Case - Mini Museum Rainbow Fossil Ammolite Gem Quality Ammonite Collectible Fossil, Includes Display Case - Mini Museum](http://shop.minimuseum.com/cdn/shop/products/ammolite-green-group-1500_1200x.jpg?v=1638479031)