Law of Superposition
By Christin and Maddie
The Law of Superposition states that any undisturbed sequence of rocks deposited in layers, the youngest layer is on top, and the bottom layer is the oldest. As some might say " the deeper we dig, the father back in time we see." This law is very important to geologist because it lets them study how long animals have been here and how long the earth has been here. We wouldn't know a lot about our Earths history without the Law of Superposition. The Law of Superposition was one of our favorite topics and we would like to share some of our knowledge about it with you!
We chose this topic because we liked learning about how scientists date the earth and the things in it. The Law of Superposition has many different factors when it comes to the rock layers. These are things like intrusions, unconformities, faults, and volcanic activity. You will learn about some of these phrases below. We think it is interesting how you can date fossils and discover new things just by looking in the ground under you.
Now that you know a little more about the Law of Superposition, we hope that you will use this information later on. As a review the Law of Superposition is an arrangement of rocks that is in layers. An intrusion is when something forces igneous rock through the already existing layers. An unconformity is when erosion wears away the rock and forms a big gap in the rock. These are just a few examples of the Law of Superposition.
Citations:
"Law of Superposition | Geology." Encyclopedia Britannica Online. Encyclopedia Britannica. Web. 11 June 2015.
"Law of Superposition | Geology." Encyclopedia Britannica Online. Encyclopedia Britannica. Web. 11 June 2015.