Absolute dating of fossils definition
This is different to relative dating, which only puts geological events in time Most absolute dates for rocks are obtained with radiometric methods.These use radioactive minerals in rocks as geological clocks.Relative fossil dating is different from absolute dating, in one important way: Absolute dating gives you a number (for example, carbon dating a fossil to 50 million years ago).Relative dating puts the fossil in context---what lived before it, and what lived after. These events may be paleontological (relating to ancient life, like dinosaur extinction); geographical (relating to earth and natural environment, like eruptions and the Ice Age); and archaeological (relating to ancient society and structures, like the appearance of the Maya).Similar layers, thousands of miles apart, come from the same period.So, fossils in those layers come from the same period as well.Others measure the subatomic particles that are emitted as an isotope decays.
These break down over time in a process scientists call radioactive decay.
For example, fission track dating measures the microscopic marks left in crystals by subatomic particles from decaying isotopes.
Another example is luminescence dating, which measures the energy from radioactive decay that is trapped inside nearby crystals.
Relative fossil dating of ancient species relies upon stratigraphy.
This is the study of layers that make up the Earth's crust.