Relative dating for geological purposes
In the late 18 century, James Hutton developed the idea that the layers found in rock outcrops were representations of the story of time on the planet.
He concluded, the bottom most layers were deposited first, thus making them the oldest and subsequent layers were progressively younger in age.
Four principles of stratigraphy give geologists ways to understand rock layers, including when and how they were created.
The Grand Canyon acts as a modern testament to stratigraphy and relative dating.
Geology, or the study of rocks, can be a fascinating way to learn about the Earth's history.
Relative dating not only determines which layers are older or younger, but also gives insight into the paleoenvironments that formed the particular sequence of rock.
Using relative dating the fossil is compared to something for which an age is already known.