Sill (geology)
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In geology, a sill is a tabular sheet intrusion that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or along the direction of foliation in metamorphic rock. A si
Illustration showing the difference between a dike and a sill.
Salisbury Crags in Edinburgh, Scotland, a sill partially exposed during the Quaternary glaciation
Mid-Carboniferous dolerite sill cutting Lower Carboniferous shales and sandstones, Horton Bluff, Minas Basin South Shore, Nova Scotia
Seismic expression of basaltic sills from the Rockall Trough. Data courtesy UK OGA.
Sheet intrusion
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A sheet intrusion, or tabular intrusion, is a planar sheet of roughly the same thickness, that forms inside a pre-existing rock. When it cuts into another unlayered mass, or across layers, it is calle
Sill (geology)
…In geology, a sill is a tabular sheet intrusion that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or along the direction of foliation in metamorphic rock. A…
A sill of monzonite intrudes Cambrian carbonate bedrock, near Notch Peak, Utah.