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The principle of superposition states that sedimentary layers are deposited in sequence, and the layers at the bottom are older than those at the top. These situations are generally rare, but they should not be forgotten when unraveling the geological history of an area. Local factors must be understood before an interpretation can be made with confidence. ![]() ![]() There are a few simple rules for doing this, but caution must be taken because there may be situations in which the rules are not valid. The most basic way of dating geological features is to look at the relationships between them. 19.2 Relative Dating Methods Relative Dating Principles
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