Relative dating does not provide actual numerical dates for the rocks.
Different species of ammonites lived at different times within the Mesozoic, so identifying a fossil species can help narrow down when a rock was formed.
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Since we assume all the layers were originally horizontal, then anything that made them not horizontal had to have happened after the fact.
While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers.
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Often, coarser-grained material can no longer be transported to an area because the transporting medium has insufficient energy to carry it to that location.
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We have five layers total.