Relative age dating lab quiz

Added: Danna Sprenger - Date: 22.04.2022 06:18 - Views: 28093 - Clicks: 2697

This is an example of a relative age diagram. It is a cross-section through the Earth. Relative age diagrams can include rock layers, intrusions, unconformities, and geologic structures folds and faults. In the diagram above, A, B , and C are sedimentary rocks. D is an igneous rock. There are somewhat standard symbols to indicate different of rocks.

These are the symbols we will use in the lab exercises click to enlarge :. Step 1: Start with the oldest rock. It is best to tell the story of what happened in the cross section by trying to find the thing that happened first rather than starting with the last thing that happened. In this case, we see that layer C is the oldest because it is on the bottom.

Step 2: List out the story of events and rocks. Include events like folding, faulting, and erosion in your story. Step 3: List the letters in the order in which they occurred. Start at the bottom oldest and list to the youngest event. Step 4: Check your logic. Use the principles of relative age dating to make sure the order makes sense. Now, it might be helpful to check by going from the youngest to the oldest event. Step 5: Are there any alternative explanations that are equally valid?

If two events such as two faults, or a fault and a dike do not overlap with each other, it may be difficult to tell which one happened first. Are there any other options besides the one you came up with first? There is only one logical answer for the example above. But what about the diagram below? The fault blue could have occurred before the dike red , or the dike could be older than the fault! But, both must be younger than the layers of sedimentary rock, because they cut across those layers. : Unconformities. Next: Relative Ages 1. Share This Book Share on Twitter.

Relative age dating lab quiz

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7 Geologic Time