クリスティーズさんのインスタグラム写真 - (クリスティーズInstagram)「Discover the natural art forms created by tectonic forces on Earth in our online-only auction dedicated to Natural History.⠀ .⠀ Featured in the sale is an incredible iridescent ammonite. The shimmering, metallic colours were caused by the combination of millions of years of compression and the mineralization of iron, copper and silica.⠀ .⠀ From the early Jurassic period, we have a well-preserved trace fossil of two Dinosaur footprints. The larger trace fossil is a Eubrontes giganteus and the two smaller footprints are the Grallator cuneatus.⠀ .⠀ Further highlights include a group of swirling white sandstone formations termed gogottes and a large imposing Xiphactinus audax skull showing impressive three dimensionality of preservation.⠀ .⠀ 1. A large iridescent ammonite (circa 75-72 million years old), Canada. Estimate: £60,000-£90,000⠀ .⠀ 2. Dinosaur Footprints (circa 200 million years old), Massachusetts, US. Estimate: £5,000-£7,000⠀ .⠀ 3. A large gogotte formation (circa 30 million years old), Fontainbleau, France. Estimate: £20,000-£30,000⠀ .⠀ 4. A large predatory fish skull (circa 70 - 120 million years old), Kansas, US. Estimate: £30,000-£50,000⠀ .⠀ Sculpted by Nature: Fossils, Minerals and Meteorites – 14 - 28 October, online.⠀⠀ .⠀ #fossils #fossil #extinctanimals #dinosaur #reptiles #skull #naturalhistory」10月18日 1時05分