How do we use the Law of Superposition to establish relative dates?
Let's look at these rock strata here: We have five layers total.
The class was able to identify the culprits, as well as indicate how the law of superposition applied. Hi, The fossil cards can be found in the same file as the letter cards from Activity 1.
Your goal is to study the smooth, parallel layers of rock to learn how the land built up over geologic time.
Now imagine that you come upon a formation like this: What do you think of it? How can you make any conclusions about rock layers that make such a crazy arrangement?
We'll even visit the Grand Canyon to solve the mystery of the Great Unconformity!
Imagine that you're a geologist, studying the amazing rock formations of the Grand Canyon.
This activity was developed for use in a high school (grades 9-12) earth science class.
It is also appropriate for an introductory level college geoscience class. The Relative Dating Lecture prepares students to be able to rank the images in the Relative Dating Activity from youngest to oldest and how to apply this to the formation of seamounts and volcanic islands.
| Teaching Weathering, Erosion, & Deposition | | Teaching the Metric System | Teaching the Water Cycle | Teaching Plate Tectonics | Teaching Earthquakes | Teaching Volcanoes | | Teaching Experimental Design | Contains over 200 pages of ready-to-run materials covering: Relative and Absolute Time, Sequencing Geologic Events, Geologic History Timelines, Geologic Eras, Fossils, Tree Cookies, and Radiactive Dating.
The Packet contains: Objectives and strategies, detailed lesson plans & ideas, bellwork and journal suggestions, labs and worksheets with answers, tests & quizzes with answers, active learning suggestions including the Rules of the Game Foldable, and game suggestions you can run off on colored paper.
Geologists use this type of method all the time to establish relative ages of rocks.
Now, what if instead of being horizontal, this rock layer was found in a tilted position?
It's called the Principle of Original Horizontality, and it just means what it sounds like: that all rock layers were originally horizontal. As you can imagine, regular sediments, like sand, silt, and clay, tend to accumulate over a wide area with a generally consistent thickness.