Geologic dating activity
If I told you that I was 30 years old, that number would be my numerical age.
If I told you I was 32 years younger than my mother, that number would be my relative age.
He could be pretty confident that his super awesome dinosaur was about 175 million years old.
Stratigraphic and fossil succession are good tools for studying the relative dates of events in Earth's history, but they do not help with numerical dating.
Scientists know that the layers they see in sedimentary rock were built up in a certain order, from bottom to top.
When they find a section of rock that has a lot of different strata, they can assume that the bottom-most layer is the oldest and the top-most layer is the youngest.
That means they don't really know how old their rocks actually are.
The key in relative dating is to find an ordered sequence.
And, he also found a coelophysis fossil in the yellow layer. Of course, the coelophysis, which means that coelophysis came before iguanodon.As a member, you'll also get unlimited access to over 79,000 lessons in math, English, science, history, and more.