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An early summary of them is found in Charles Lyell's .
In no way are they meant to imply there are no exceptions.
It can't float in mid-air, particularly if the material involved is sand, mud, or molten rock.
The principle of superposition therefore has a clear implication for the age of a vertical succession of strata.
The layers of rock are known as "strata", and the study of their succession is known as "stratigraphy".