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111:, areas of uplift, etc. It is also sometimes applied to fossils which appear sporadically at different times in different places due to migration, though such usage is regarded by some authors as incorrect. In academic librarianship, the adjectival form, diachronous, is used in the context of "diachronous obsolescence" to describe the reduction of usefulness of a book or journal volume over several years.
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The detection of diachronous beds can be quite problematic since fossil assemblages tend to migrate geographically with their environment of formation. They are generally revealed by the presence of marker species, fossils which can be dated reliably from other beds.
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formation in which the material, although of a similar nature, varies in age with the place where it was deposited.
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The term may also be applied to other features that vary in age, such as
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An example is the sandy beds near the end of the lower
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131:A Dictionary of Geology
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