Geology

Definitions and images to illustrate geological terms, links to images and website articles

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▪ unconformity

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sills

Sills are tabular slabs or concordant intrusive (plutonic) sheets of igneous rock that intruded laterally and horizontally, or nearly horizontally, as magma. Sills lie between and parallel to layers of older sedimentary rock, beds of volcanic lava or tuff, or along the direction of foliation in metamorphic rock.

Labels: concordant, igneous rock, intrusive, sill, tabular

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