- (E) The geologic time scale is a system that describes the timing and
relationships between events that have occurred throughout Earth’s history.
The identification of strata or rock layers by the fossils they contained
enabled geologists to correlate strata between continents. If two strata
(however far apart or different in composition) contained the same fossils, it
was likely they had been laid down at the same time. The principle of
superposition states that a sedimentary rock layer in an undisturbed
sequence is younger than the one beneath it and older than the one above it.
This principle allows sedimentary layers to be viewed as a vertical timeline,
a partial or complete record of the time elapsed from the deposition of the
lowest layer to the deposition of the highest bed.
marvins-underground-k-12
(Marvins-Underground-K-12)
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