Sill (geology) - Wikipedia 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 sill is a concordant intrusive sheet, meaning that it does not cut across pre-existing rock beds
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SILL Definition Meaning - Merriam-Webster The meaning of SILL is a horizontal piece (such as a timber) that forms the lowest member or one of the lowest members of a framework or supporting structure
Sill | Igneous Rock, Intrusive Layer Magma Chamber | Britannica sill, flat intrusion of igneous rock that forms between preexisting layers of rock Sills occur in parallel to the bedding of the other rocks that enclose them, and, though they may have vertical to horizontal orientations, nearly horizontal sills are the most common
Sill - Geology is the Way A sill is a sheet intrusion emplaced parallel to the structures present within its host rocks Its primary feature is to be concordant and never crosscut, indeed, the foliation or bedding planes in the host, which magma exploits as planes of weakness to move underground
9. 13: Reading- Dikes and Sills - Geosciences LibreTexts 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 even along the direction of foliation in metamorphic rock The term sill is synonymous with concordant intrusive sheet