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.
Diabase
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Diabase, also called dolerite or microgabbro, is a mafic, holocrystalline, subvolcanic rock chemically equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow i
Sill (geology)
…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 In geology, a sill is a tabular sheet intrusion…
Diabase
Fair Head, Northern Ireland, a sill of dolerite
A diabase dike crosscutting horizontal limestone beds in Arizona
Diabase boulders at Devil's Den on the Gettysburg Battlefield, Pennsylvania, US