Part 1: Geologic Time & Basic Principles (Steno's Principles,1669)
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6 Terms
1
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Q: What is “deep time” in geology?
A: Earth’s immense age—billions of years—so vast it’s hard to comprehend.
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Q: How old is Earth and how do we know?
A: About 4.6 billion years, determined from radiometric dating of meteorites.
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Q: What are the main subdivisions of geologic time?
A: Eon → Era → Period → Epoch → Age.
4
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Q: What is the Principle of Superposition?
A: In undisturbed strata, oldest rocks are at the bottom, youngest at the top.
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Q: What is the Principle of Original Horizontality?
A: Sediments are originally deposited horizontally; tilting happens later.
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Q: What is the Principle of Lateral Continuity?
A: Layers extend laterally until they thin or meet a boundary.