Half lives used carbon dating fossils rocks
When we think of fossils, the first things that come to mind are the bones of dinosaurs; but a fossil can be anything.Footprints, flowers, even droppings; all of these things can be turned into fossils under the right conditions.Paleontologists consider materials younger than 10,000 years ago “recent”.The oldest uncontested fossils on earth are 2 billion year-old stromatolites in Minnesota, Wisconsin, and Ontario. What scavengers like vultures and hyenas leave behind, flies, ants, worms, and bacteria quickly consume.Within three weeks, there will be nothing left but a few small bones." A fossil normally preserves only a portion of an organism, usually that portion that was partially mineralized during life, such as bones and teeth.A sticky goo that surrounds the bacteria allows precipitation of minerals and entrapment of sediments, making a bulbous structure.
Fossils are found all over the world and on every continent.
The results showed that Ötzi died over 5000 years ago, sometime between 33 BC. Uranium has a very long half-life and so by measuring how much uranium is left in a rock its approximate age can be worked out.
Scientist Olivia Judson provides this good example of what happens to an adult male gorilla in the tropical rainforests of the Congo; "An adult male gorilla— all 330 pounds of him—will be reduced to a pile of bones and hair within 10 days of his death.
Fossils, by definition, are the remains or traces of organisms that lived at least 10,000 years ago.
This date marks the end of the Cenozoic Era and the Pleistocene Period on the geologic time scale.