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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 sill is a concordant intrusive sheet , meaning that it does not cut across preexisting rock beds.
The Whin Sill or Great Whin Sill is a tabular layer of the igneous rock dolerite in County Durham, Northumberland and Cumbria in the northeast of England. It lies partly in the North Pennines Area of Outstanding Natural Beauty and partly in Northumberland National Park and stretches from Teesdale northwards towards Berwick .
The most intriguing geological feature of the sill is a 10-meter-thick olivine-rich zone roughly 10 meters (30 ft) from the lower contact. The modal percent of olivine goes from 0-2% within the main body of the sill to up to 28% within this layer.
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Pigeon Point is the most eastern part of Minnesota; it is a diabase sill about 152 m (500 ft) thick. [3]: 68 Both the north and south coasts of the point expose Rove slates under and over the sill. [3]: 68 Within the sill, rates of cooling and gravity have created an interesting distribution of rock types. [3]: 68
A sill swarm or sill complex in geology is a major group of sills intruded within continental crust. They are located under volcanic edifices, including flood basalt provinces and large lava plateaus. The volume of sill swarms can be similar to dike swarms. [1]
Sill (dock), a weir at the low water mark retaining water within a dock; Sill (geology), a subhorizontal sheet intrusion of molten or solidified magma; Sill (geostatistics) Sill (river), a river in Austria; Sill plate, a construction element Window sill, a more specific construction element than above
Mount Sill is located 0.6 miles (1 km) east of North Palisade, the high point of the group. The two peaks are connected by a high, rocky ridge, on the north side of which lies the Palisade Glacier . Mount Sill lies on the main Sierra Crest , but is at a point where the crest turns sharply, giving it particularly striking summit views.