Iridium
Videos
Iridium is a chemical element; it has the symbol Ir and atomic number 77. This very hard, brittle, silvery-white transition metal of the platinum group is considered the second-densest naturally occur
Iridium
One troy ounce (31.1035 grams) of arc-melted iridium
Hydrated iridium trichloride, a common salt of iridium.
The Greek goddess Iris, after whom iridium was named.
The Cretaceous–Paleogene extinction event, formerly known as the Cretaceous–Tertiary extinction event, was a major mass extinction of three-quarters of the plant and animal species on Earth which occu
Iridium
…the clay layer at the Cretaceous–Paleogene boundary gave rise to the Alvarez hypothesis that the impact of a massive extraterrestrial object caused the extinction of non-avian dinosaurs and many other species 66 million years ago, now known to be produced by the impact that formed the Chicxulub crater. Similarly, an iridium anomaly in core samples from the Pacific Ocean suggested…
Discoscaphites iris, an ammonite from the Owl Creek Formation (Upper Cretaceous), in Owl Creek near Ripley, Mississippi
Rudist bivalves from the Late Cretaceous of the Omani Mountains, United Arab Emirates. Scale bar is 10 mm.
Tyrannosaurus was among the dinosaurs living on Earth before the extinction
Hell Creek Formation