Relative age dating lesson jon heder dating
How do we use the Law of Superposition to establish relative dates?
Let's look at these rock strata here: We have five layers total.
Your goal is to study the smooth, parallel layers of rock to learn how the land built up over geologic time.
We're not so sure about the next layer down, but the one below it is 100 million years old. Not exactly, but we do know that it's somewhere between 70 and 100 million years old.
Geologists use this type of method all the time to establish relative ages of rocks.
Now, what if instead of being horizontal, this rock layer was found in a tilted position?
Relative dating cannot establish absolute age, but it can establish whether one rock is older or younger than another.
Relative dating requires an extensive knowledge of stratigraphic succession, a fancy term for the way rock strata are built up and changed by geologic processes.