5 How is sill different from dyke?
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A sill is a concordant intrusive sheet, meaning that a sill does not cut across preexisting rock beds. In contrast, a dike is a discordant intrusive sheet, which does cut across older rocks. Sills are fed by dikes, except in unusual locations where they form in nearly vertical beds attached directly to a magma source.
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A sill is a concordant intrusive sheet, meaning that a sill does not cut across preexisting rock beds. ... In contrast, a dike is a discordant intrusive sheet, which does cut across older rocks. Sills are fed by dikes, except in unusual locations where they form in nearly vertical beds attached directly to a magma source.
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