Types of relative dating

04.11.2017 1 Comments

Of course, the coelophysis, which means that coelophysis came before iguanodon. Let's look at these rock strata here: Let's say we find out, through numerical dating, that the rock layer shown above is 70 million years old. We'll explore both relative and numerical dating on our quest to understand the process of geological dating. The highest layers tell them what happened more recently, and the lowest layers tell them what happened longer ago. The Principle of Cross-Cutting Relationships.

Types of relative dating


If it had happened before the layers had formed, then we wouldn't see it punching through all the layers; we would only see it going through the layers that had existed at the time that it happened. Relative dating requires an extensive knowledge of stratigraphic succession, a fancy term for the way rock strata are built up and changed by geologic processes. So, in both geology and paleontology, we want to be able to point to an object and say exactly how old it is. Let's say that Paul the Paleontologist found an iguanodon fossil in the light green layer shown above. April Koch April teaches high school science and holds a master's degree in education. This is just a fancy term for the way rock layers are built up and changed by geologic processes. The key in relative dating is to find an ordered sequence. The numerical age, because it is exact. Dating Dinosaur Fossils Consider the following scenario: We could assume that this igneous intrusion must have happened after the formation of the strata. Let's look at these rock strata here: How do you study it? It's called the Principle of Original Horizontality, and it just means what it sounds like: Again, it's pretty obvious if you think about it. If I told you I was 32 years younger than my mother, that number would be my relative age. As you can imagine, regular sediments, like sand, silt, and clay, tend to accumulate over a wide area with a generally consistent thickness. Recently, he appeared on the evening news to talk about a new dinosaur he just discovered. Since we assume all the layers were originally horizontal, then anything that made them not horizontal had to have happened after the fact. We'll explore both relative and numerical dating on our quest to understand the process of geological dating. Of course, the coelophysis, which means that coelophysis came before iguanodon. He could be pretty confident that his super awesome dinosaur was about million years old. Following the Principle of Original Horizontality, he could say that whatever forces caused the deformation, like an earthquake, must have occurred after the formation of all the rock strata. Paul says he can tell from the fossils that superus awesomus lived on Earth about million years ago. Well, they figure it out using two different methods: How do they know these ages? Law of Superposition Once we assume that all rock layers were originally horizontal, we can make another assumption: The dinosaur is called superus awesomus.

Types of relative dating


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1 thoughts on “Types of relative dating”

  1. This rule is called the Law of Superposition. It sounds like common sense to you and me, but geologists have to define the Principle of Original Horizontality in order to make assumptions about the relative ages of sedimentary rocks.

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