Because the earth is so old and rocks formed millions of years ago, geologists needed a way to date rocks and rock units called strata.
Today there are two common practices for dating rocks and strata. Geologists use what they see and some simple strategies to relative date the rock layers found in the Grand Canyon.
Relative dating does not provide actual numerical dates for the rocks.
Law of superposition: This is one of the most basic techniques of relative dating geologists use.
Scientists are always spouting information about the ages of rocks and fossils. Well, they figure it out using two different methods: relative dating and numerical dating.
Let's find out more about these geological dating methods in order to understand how Paul the Paleontologist can be so sure about the age of his dinosaur fossils.
So, instead of saying when something happened, it puts events in the order they happened.
So, basically it's the difference between saying 'I'm 25 years old, and my sibling is 20 years old' and 'I'm older than my sibling.' Geologists use a variety of techniques, or principles, to determine the relative age of a rock unit.