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Geologic Time Puzzle

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