Radioactive decay and fossil dating park hyun byul webcam
The final decay product, lead-208 (208Pb), is stable and can no longer undergo spontaneous radioactive decay.Systems that have been exploited for radiometric dating have half-lives ranging from only about 10 years (e.g., tritium) to over 100 billion years (e.g., Samarium-147).
Each step in such a chain is characterized by a distinct half-life.
Index fossils are fossils that can be used to date the rock in which they are found.
The best examples are fossils of animals or plants that lived for a very short period of time and were found in a lot of places.
The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly.
Scientists use two kinds of dating techniques to work out the age of rocks and fossils. This considers the positions of the different rocks in sequence (in relation to each other) and the different types of fossil that are found in them.