Isn t carbon dating used dinosaur bones
So long as the temperature remains below freezing, the animal stays frozen, sort of like a natural freezer.Paleontologists have found woolly mammoths perfectly preserved in permafrost.How Fossils are Dated: Superposition, Carbon-14, and Radiometric Dating Imagine you've found a fossil in your backyard and you want to know how old it is. A long time ago scientists used the concept of superposition, which states that the oldest layer of sedimentary rock is found at the bottom of the strata, or layers, and the youngest at the top.While they didn't have exact dates for how old these strata were, they could determine which fossils were older than others based on which layer they were found in.Some organic material, like tree trunks, can be petrified.Petrification happens when the organic material is slowly replaced by minerals. Making a fossil is tricky and the conditions have to be just right.Some fossils are the actual remains of a plant or animal that has been frozen in ice or trapped in a substance like sap. Despite this, there are several different ways for a living thing to become a fossil.
When we think of fossils, the first things that come to mind are the bones of dinosaurs; but a fossil can be anything.
Though there is no one age, a good rule is anything over 10,000 years old can be considered a fossil.
The oldest fossils ever discovered are more than 3.5 billion years old.
Groundwater seeps into the newly made stone and dissolves the bone, leaving behind a mold.
The mold is an empty cavity, and can be filled with minerals that become a cast for the long dissolved bone.