Laggangur

Laggangur, innskotslag eða silla er lárétt innskot samhliða jarðlögunum. Laggangur verður til þegar bergkvika treður sér inn í sem næst lárétta eða lítt hallandi sprungu djúpt í jörðu eða lagmót, til dæmis á milli hraunlaga. Getur samt verið erfitt að greina það frá hraunlögum.

Photo showing columnar basalts on the Faroe Islands

Mynd sýnir stuðlaberg í Færeyjum ( (http://www.panoramio.com/photo/55215166)

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