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by the fossils found in them.And by their mineralogy. And by their sedimentology. And by their environment of deposition. And by their internal structures. And by their horizontal and vertical variation. And by their boundaries. And by the strata adjacent to them.
So fossils cannot be found outside the proper layer
becasue
the layer is identified by the fossils it contains.
If the fossils are "mixed" then it is assumed the layers have become mixed.
This is how people can claim they are never in the wrong layer.
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