How to use relative age dating

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Relative and absolute ages in the histories of Earth and the Moon: The Geologic Time Scale

A few days ago, I wrote a post about the basins of the Moon -- a result of a trip down a rabbit hole of book research. In the science of geology, there are two main ways we use to describe how old a thing is or how long ago an event took place. There are absolute ages and there are relative ages. People love absolute ages. An absolute age is a number. When you say that I am 38 years old or that the dinosaurs died out 65 million years ago, or that the solar system formed 4. We use a variety of laboratory techniques to figure out absolute ages of rocks, often having to do with the known rates of decay of radioactive elements into detectable daughter products. Unfortunately, those methods don't work on all rocks, and they don't work at all if you don't have rocks in the laboratory to age-date. There's no absolute age-dating method that works from orbit, and although scientists are working on age-dating instruments small enough to fly on a lander I'm looking at you, Barbara Cohen , nothing has launched yet.

For classroom activities based on using Steno's Laws to examine relative geologic time click here sampleactivity. Back Home Next. Law of Superposition In a sequence of rock strata, the oldest layer will lie below or underneath the youngest. Click on photo to enlarge:. Law of Original Horizontality Layers of sediment, such as you would have in the bottom of a lake, or the ocean, are deposited by gravity into flat layers. Law of Cross-Cutting If a rock layer is cut by a fault or igneous intrusion, the rock that is cut must be older than the layer that cuts it.

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Tryon St. Charlotte, NC N. Davidson St. What are the two laws of relative dating Study 4 stenos principles to determine what caused these laws related to older rocks are the bottom, this interactive quiz and printable worksheet. Test your knowledge of granite? These layers to compare their ages.

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Principles of Geology

The Principle of Superposition tells us that deeper layers of rock are older than shallower layers Relative dating utilizes six fundamental principles to determine the relative age of a formation or event. This follows due to the fact that sedimentary rock is produced from the gradual accumulation of sediment on the surface. Therefore newer sediment is continually deposited on top of previously deposited or older sediment.

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