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Geologic Time Puzzle

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Across
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Principle that states that layers of sediment are generally deposited across an area.
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Strata on either side are essentially parallel, but resemble the units above and below it with little evidence of erosion.
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A radioactive isotope
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Pieces of a rock unit that are contained within another
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Placing rocks in their proper sequence of formation
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The amount of time for half of a radioactive nuclei to decay
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Used to correlate sedimentary rocks from different regions by using a principle of succession
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Law which states that each bed is older than the one above it and younger than the one below it.
Down
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Represent a long period during which deposition ceased, erosion removed sediment, then deposition resumed.
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This principle states that an intrusion is younger than the surrounding rock
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This type of unconformity consists of tilted or folded sedimentary rocks that are overlain by younger , more flat lying strata
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The study of fossils