Discussion
The law of superposition states that in an undisturbed sequence
Answer: A
Correct answer: younger beds overlie older ones
Sediment accumulates from the bottom up, so in a sequence that has not been overturned each bed is younger than the one beneath. The qualification matters: intense folding can invert a sequence entirely, which is why criteria for the way up - graded bedding, ripple marks, sole structures - are looked for before the law is applied.
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