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countable and uncountable, plural intercalations
A period inserted into a calendar as in a leap year. examples
(chemistry) The reversible insertion of a molecule between two others. examples
(geology) A layer introduced into a pre-existing sequence. quotations
Their exact relationship to the host-rock is obscure but from their texture and observed metamorphic relationship they are thought to be intrusive dykes rather than intercalations of more basic lava.
1968, Transactions of the Geological Society of South Africa, page 148