The Stirling Sill is the outcropping of a large quartz-dolerite intrusion or sill similar to those which underly a large part of Central Scotland, and may be contiguous at great depth. The sill is of very late carboniferous age or more probably permian, as it penetrates the coal measures, often in bedding planes between the various strata, but in places it rises through fractures in the strata to a new level, forming features which, were they to be at the surface, would be called dykes. An intrusive rock, similar to dolerite, but with an excess of quartz. ... In geology, a sill is a tabular mass of igneous rock that has been intruded laterally between layers of older rock. ... ... In geology, a sill is a tabular mass of igneous rock that has been intruded laterally between layers of older rock. ... The Carboniferous is a major division of the geologic timescale that extends from the end of the Devonian period, about 359. ... The Permian is a geologic period that extends from about 299. ... A coal measure (stratigraphic unit) is the name given to any rock sequence that occurs in the upper part of the Carboniferous System in Europe. ... Dyke (normal International spelling) or Dike (normal American spelling) can mean several things: A dyke / dike is a long wall built to keep out the sea or enclose land. ...

At its outcrop on the west, the sill generally lies towards the base of the carboniferous sequence, and just above the calciferous sandstone deposits and lavas, as can be seen in the upper part of the Bannock valley. However, to the consternation of miners, it occupies a higher position amonst the useful strate towards the east, and in places has destroyed the coal, while in others the effect of the sill has been to convert the coal to more valuable anthracite. In geology, a sill is a tabular mass of igneous rock that has been intruded laterally between layers of older rock. ... The Carboniferous is a major division of the geologic timescale that extends from the end of the Devonian period, about 359. ... A geological term relating to strata at the base of the carboniferous formation, below the entire sequence of coal measures. ... The Bannock are a Native American people of what is now southeastern Oregon and western Idaho. ... In geology, a sill is a tabular mass of igneous rock that has been intruded laterally between layers of older rock. ... Coal is a fossil fuel extracted from the ground by deep mining, coal mining (open-pit mining or strip mining). ... Anthracite coal Anthracite is a hard, compact variety of mineral coal that has a high luster. ...

The slope of the Abbey Craig, or the Stirling Castle rock, gives a general idea of the angle of dip of the coal measures at the extremity or the coalfield, and the thickness of the sill can also be seen, which is in the region of 100 metres. Stirling Castle (southwest aspect) Stirling Castle is an historic castle in Stirling, Scotland. ... A coal measure (stratigraphic unit) is the name given to any rock sequence that occurs in the upper part of the Carboniferous System in Europe. ...

Some geologists have had various theories about the formation of anthracite, as the coal has been most effectively baked near the Ochil Fault, however the theories are not necessarily incompatible. The Ochil Fault is the geological feature which defines the southern face of the Ochil Hills escarpment. ...

The source of the sill, where the molten rock rose from below, is not known, however it is known that there are risers in the Ochil Fault, although these are inconsistent with the overall structure. The main origin of the sill may be in the region of the eruptive centre which formed the Ochil Hills in a much earlier period, which is postulated to be somewhere to the east of Stirling, possibly in the region of Kincardine. This would tie in with subsidence following the first round of eruptive activity leading to the formation of the coal basins, with a much later outbreak of intrusive activity from the same magma feeders, however the truth will remain unknown because it would take very many deep bores in hard rock to probe the depths and find the necessary evidence. In geology, a sill is a tabular mass of igneous rock that has been intruded laterally between layers of older rock. ... The Ochil Fault is the geological feature which defines the southern face of the Ochil Hills escarpment. ... In geology, a sill is a tabular mass of igneous rock that has been intruded laterally between layers of older rock. ... The Ochil Hills are a range of hills in Scotland north of the Forth valley bordered by the towns of Stirling, Alloa, Kinross and Perth. ... Stirling (Sruighlea in Gaelic) is a city in Central Scotland, in the district of Stirling. ... Kincardine can refer to: Kincardineshire, a traditional county of Scotland Kincardine, Scotland, a town in Fife, Scotland The Kincardine Bridge which crosses the River Forth to the south of the Scottish town Kincardine, Ontario, a municipality in Ontario, Canada This is a disambiguation page — a navigational aid which lists other...

The western extremities of the sill can be seen at the Abbey Craig, Stirling Castle, Kings Park, Gillies Hill, Sauchieburn and various points to the south. The quartz-dolerite was once quarried at several places including Cambusbarron and Murrayshall, but is quarried today at Northfield, primarily for roadstone. In geology, a sill is a tabular mass of igneous rock that has been intruded laterally between layers of older rock. ... The Abbey Craig is the hill upon which the Wallace Monument stands, at Causewayhead, just to the north of Stirling. ... Stirling Castle (southwest aspect) Stirling Castle is an historic castle in Stirling, Scotland. ... Kings Park may also refers to Kings Park, New South Wales. ... An intrusive rock, similar to dolerite, but with an excess of quartz. ...