Stirling Sill (original) (raw)
The Stirling Sill is an outcropping of a large quartz-dolerite intrusion or sill that underlies 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. In places, it rises through fractures in the strata to a new level, forming features that, at the surface, would be called dikes.
| Property | Value |
|---|---|
| dbo:abstract | The Stirling Sill is an outcropping of a large quartz-dolerite intrusion or sill that underlies 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. In places, it rises through fractures in the strata to a new level, forming features that, at the surface, would be called dikes. 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 valley of the Bannock Burn. However, to the consternation of miners, it occupies a higher position amongst the useful strata 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. 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 approximately 100 metres. 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 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 that formed the Ochil Hills in a much earlier period, which geologists postulate is somewhere to the east of Stirling, possibly in the region of Kincardine. This ties in with subsidence following the first round of eruptive activity that lead 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. 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. (en) |
| dbo:wikiPageID | 3304520 (xsd:integer) |
| dbo:wikiPageLength | 3501 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1082178616 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Cambusbarron dbr:Carboniferous dbr:Bed_(geology) dbr:Scotland dbr:Permian dbc:Landforms_of_Stirling_(council_area) dbr:Intrusion dbr:Ochil_Fault dbr:Ochil_Hills dbr:Quartz-dolerite dbc:Geography_of_Stirling_(council_area) dbc:Mines_in_Scotland dbr:Anthracite dbr:Magma dbr:Calciferous_sandstone dbr:Stirling dbr:Stirling_Castle dbr:Strike_and_dip dbr:Bannock_Burn dbr:Abbey_Craig dbc:Sills_(geology) dbr:Dike_(geology) dbc:Geology_of_Scotland dbc:Hills_of_the_Scottish_Midland_Valley dbr:Kincardine-on-Forth dbr:Coal dbr:Coal_measures dbr:Terrace_(geology) dbr:Sill_(geology) |
| dbp:wikiPageUsesTemplate | dbt:Citation_needed dbt:Coord dbt:Use_dmy_dates |
| dct:subject | dbc:Landforms_of_Stirling_(council_area) dbc:Geography_of_Stirling_(council_area) dbc:Mines_in_Scotland dbc:Sills_(geology) dbc:Geology_of_Scotland dbc:Hills_of_the_Scottish_Midland_Valley |
| georss:point | 56.123 -3.946 |
| rdf:type | yago:WikicatMinesInScotland geo:SpatialThing yago:Artifact100021939 yago:Excavation103302121 yago:GeologicalFormation109287968 yago:Hill109303008 yago:Mine103768346 yago:NaturalElevation109366317 yago:Object100002684 yago:PhysicalEntity100001930 yago:WikicatHillsOfTheScottishMidlandValley yago:YagoGeoEntity yago:YagoPermanentlyLocatedEntity yago:Whole100003553 |
| rdfs:comment | The Stirling Sill is an outcropping of a large quartz-dolerite intrusion or sill that underlies 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. In places, it rises through fractures in the strata to a new level, forming features that, at the surface, would be called dikes. (en) |
| rdfs:label | Stirling Sill (en) |
| owl:sameAs | freebase:Stirling Sill yago-res:Stirling Sill wikidata:Stirling Sill dbpedia-he:Stirling Sill https://global.dbpedia.org/id/4vb75 |
| geo:geometry | POINT(-3.9460000991821 56.123001098633) |
| geo:lat | 56.123001 (xsd:float) |
| geo:long | -3.946000 (xsd:float) |
| prov:wasDerivedFrom | wikipedia-en:Stirling_Sill?oldid=1082178616&ns=0 |
| foaf:isPrimaryTopicOf | wikipedia-en:Stirling_Sill |
| is dbo:wikiPageDisambiguates of | dbr:Stirling_(disambiguation) |
| is dbo:wikiPageWikiLink of | dbr:Stirling dbr:Stirling_Castle dbr:Stirling_(disambiguation) dbr:Bannock_Burn dbr:Abbey_Craig |
| is foaf:primaryTopic of | wikipedia-en:Stirling_Sill |