What does sill mean in geology?
What does sill mean in geology?
Sill, also called sheet, 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.
What is the difference between sill and sill?
The oracle for the English language, the Oxford English Dictionary, lists cill as a variant spelling of sill. So, both spellings are correct although the most common usage is sill and not cill. As an example, if you search the web for the word cill on Google the search engine will display a box with the spelling sill.
What is dike and sill?
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. In contrast, a dike is a discordant intrusive sheet, which does cut across older rocks.
How is a sill formed geology?
Sills: form when magma intrudes between the rock layers, forming a horizontal or gently-dipping sheet of igneous rock.
What is another word for sill?
In this page you can discover 21 synonyms, antonyms, idiomatic expressions, and related words for sill, like: ledge, threshold, beam, batholith, doorstone, mudsill, transom, lintel, roof, soffit and bulkhead.
How is sill formed?
Sills: form when magma intrudes between the rock layers, forming a horizontal or gently-dipping sheet of igneous rock. The Whin Sill (top left image) in N. England provided a defensive cliff-line on which the Romans built Hadrian’s Wall.
What sill means?
1 : a horizontal piece (such as a timber) that forms the lowest member or one of the lowest members of a framework or supporting structure: such as. a : the horizontal member at the base of a window. b : the threshold of a door.
What is a sill volcano?
Sills are concordant tabular plutonic sheets within the beds of volcanic lave, or tuff, intrusive within the layers of older sedimentary rocks, and along the direction of foliation in metamorphic rocks.
How dikes are formed?
Dikes are tabular or sheet-like bodies of magma that cut through and across the layering of adjacent rocks. They form when magma rises into an existing fracture, or creates a new crack by forcing its way through existing rock, and then solidifies.
What does the term sill mean in 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 even along the direction of foliation in metamorphic rock. The term sill is synonymous with concordant intrusive sheet.
What is the difference between a sill and a cill?
Sill (noun) A horizontal layer of igneous rock between older rock beds. Sill (noun) A piece of timber across the bottom of a canal lock for the gates to shut against. Sill (noun) A raised area at the base of the nasal aperture in the skull.
Where does a sill occur in a rock bed?
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.
Which is the most common orientation of a sill?
Sill, also called sheet, 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.