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Sill

En sill er en intrusion parallel med lagdelingen i den geologiske lagserie. Dette medfører, at de er meget sværere at genkende. En sill opstår på grund af højt tryk, stres og deformation i et nærtliggende område. For at kunne genkende en sill, må der ofte en mere detaljeret undersøgelse til.

For både gange og sill lavet af vulkanske bjergarter gælder det, at de ofte danner søjler, på grund af nedkølingsprocessen.

Photo showing columnar basalts on the Faroe Islands

Billedet visar kolonne-basalt på Færøerne. (http://www.panoramio.com/photo/55215166)

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