Relative age dating animation
He realized that for both to occur would take an extremely long time. What evidence is used to match rock layers in different places? They may be found on more than one continent or in more than one country.
This made him realize that Earth must be much older than people thought. It meant there was enough time for life to evolve gradually. [Insert a link to a video or animation about Hutton’s unconformity.] When rock layers are in the same place, it’s easy to give them relative ages. For example, the famous White Cliffs of Dover are on the coast of southeastern England.
Erosion may have worn away some of the rock, but layers on either side of eroded areas will still “match up.” Look at the Grand Canyon in Figure below. You can clearly see the same rock layers on opposite sides of the canyon.
Divisions in Earth history are recorded on the geologic time scale.The relative ages of rocks are important for understanding Earth’s history.New rock layers are always deposited on top of existing rock layers.Hutton's discovery was a very important event in geology!Hutton determined that the rocks were deposited over time. Hutton knew that deposition and erosion are very slow.