Determining Geologic Ages
Determining Geologic Ages: Relative Age
Directions: Use pages 117-121 in Earth’s Changing Surface to complete the following.
1. Relative age is the __________ of a rock _____________ to the ___________ of other rocks.
2. Absolute age is the _____________ of ___________ since the rock was formed… How old it is!
3. Law of Superposition: In ________________________ _____________________ rock layers, the ________________ is at the bottom. Each _________________ layer is _________________ than the one below it. Example: __________________________________________________________________
4. Which layers above were disturbed by crustal movements after their deposition? A-D or E - G
5. Using the “relative” dating method, date the rock layers above starting with the oldest one on the left.
______ ______ ______ ______ ______ ______ ______ ______
Oldest Youngest
IGNEOUS ROCK CLUES: EXCLUSIONS AND INCLUSIONS
6. Lava that hardens on the surface is called and ________________. It is always ________________ than the rocks below it.
7. Lava that _________ into other bodies of rock and hardens is called an ____________. It is always _______________ than the rocks below it.
8. Identify and label the inclusions in the diagram with an “I.”
9. Of the two rock layers, C and B, ______ is older. Why do you believe this?
________________________________________________________________________________________
FAULT CLUES AND GAPS IN THE GEOLOGICAL RECORD
10. A fault is a ___________________ in Earth’s crust.
11. A fault is always ____________________ than the rock it cuts through.
12. To find the age of a fault, geologists must find the __________________ of the ___________________ rock it cuts through.
13. An ____________________________ is created when part of an younger rock layer __________________ and exposes part of an _____________ rock layer. When ___________________ begins again, where the new rock layers meets the much _______________ rock layer beneath it, a ____________________ is created, which leads to ________________ in the ___________________ record.
14. What does the border between layer F and E represent in the diagram below? ___________________
15. Which layer in this sample above is the oldest? _____________
16. What is segment C considered geologically? ____________________
17. Is Fault H older or younger than the sedimentary rocks A-D? _____________________
18. Is the relative age of fault H older or younger than sedimentary layer F? ______________________
19. Did the fault occur before or after the igneous intrusion? ___________________
Explain:
____________________________________________________________________________________
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In the space below, draw the process that leads to an unconformity. (Fig. 7, p. 120)
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Name________________________________________ Date: ________________ Period: _______
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