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Geology Of Northumberland
: ''This article describes the geology of the historic county of Northumberland. It does not include that southeastern part of the historic county which has since 1974 formed a part of the metropolitan county of Tyne and Wear'' The geology of Northumberland in northeast England includes a mix of sedimentary, intrusive and extrusive igneous rocks from the Palaeozoic and Cenozoic eras. Devonian age volcanic rocks and a granite pluton form the Cheviot massif. The geology of the rest of the county is characterised largely by a thick sequence of sedimentary rocks of Carboniferous age. These are intruded by both Permian and Palaeogene dykes and sills and the whole is overlain by unconsolidated sediments from the last ice age and the post-glacial period. The Whin Sill makes a significant impact on Northumberland's character and the former working of the Northumberland Coalfield significantly influenced the development of the county's economy. The county's geology contributes to a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northumberland Coalfield
The Northumberland Coalfield is a coalfield in north-east England. It is continuous with the Durham Coalfield to its south. It extends from Shilbottle in the north to the boundary with County Durham along the River Tyne in the south, beyond which is the Durham Coalfield. The two contiguous coalfield areas were often referred to as the Durham and Northumberland Coalfield(s) or as the Great Northern Coalfield. Coal seams The following coal seams are recorded from the Northumberland Coalfield. They are listed here in stratigraphic order with the youngest at the top and the oldest/deepest at the bottom.British Geological Survey 1:50,000 scale geological map sheet nos 6, 9, 10, 14 (England & Wales series) ''Alnwick'', ''Rothbury'', ''Newbiggin'' & ''Morpeth'' Not all seams are named and not all occur at any one locality. Pennine Coal Measures Group ( Westphalian) Upper Coal Measures * Killingworth * West Moor * Top Hebburn Fell * Bottom Hebburn Fell * Usworth Middle Coal Measures * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhyolite
Rhyolite ( ) is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral assemblage is predominantly quartz, sanidine, and plagioclase. It is the extrusive equivalent to granite. Rhyolitic magma is extremely viscous, due to its high silica content. This favors explosive eruptions over effusive eruptions, so this type of magma is more often erupted as pyroclastic rock than as lava flows. Rhyolitic ash-flow tuffs are among the most voluminous of continental igneous rock formations. Rhyolitic tuff has been extensively used for construction. Obsidian, which is rhyolitic volcanic glass, has been used for tools from prehistoric times to the present day because it can be shaped to an extremely sharp edge. Rhyolitic pumice finds use as an abrasive, in concrete, and as a soil amendment. Description Rhyolite i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lava
Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from . The volcanic rock resulting from subsequent cooling is also often called ''lava''. A lava flow is an outpouring of lava during an effusive eruption. (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows.) The viscosity of most lava is about that of ketchup, roughly 10,000 to 100,000 times that of water. Even so, lava can flow great distances before cooling causes it to solidify, because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping to keep it hot and inviscid enough to continue flowing. The word ''lava'' comes from Italian and is probably derived from the Latin word ''labes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andesite
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. Andesite is the extrusive equivalent of plutonic diorite. Characteristic of subduction zones, andesite represents the dominant rock type in island arcs. The average composition of the continental crust is andesitic. Along with basalts, andesites are a component of the Martian crust. The name ''andesite'' is derived from the Andes mountain range, where this rock type is found in abundance. It was first applied by Christian Leopold von Buch in 1826. Description Andesite is an aphanitic (fine-grained) igneous rock that is intermediate in its content of silica and low in alkali metals. It has less than 20% quartz and 10% feldspathoid by volume, with at least 65% of the fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reston Group
The Reston Group is a Silurian to Devonian lithostratigraphic group (a sequence of rock strata) in the Southern Uplands terrane of southern Scotland and northernmost England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b .... The name is derived from Reston in the Scottish Borders. The rocks of the Reston Group have also previously been referred to as 'Lower Old Red Sandstone and Lavas' References {{Reflist Silurian System of Europe Devonian System of Europe Geology of England Geology of Scotland Geological groups of the United Kingdom Geologic formations of the United Kingdom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Cheviot
The Cheviot () is an extinct volcano and the highest summit in the Cheviot Hills and in the county of Northumberland. Located in the extreme north of England, it is a walk from the Scottish border and, with a height of above sea-level, is located on the northernmost few miles of the Pennine Way, before the descent into Kirk Yetholm. The Cheviot was formed when melting in the crust over 390 million years ago gave rise to volcanic activity, and it has subsequently sustained intense erosion. Several watercourses radiate from The Cheviot. How this tranquil part of the North East is far from the madding crowd . Chronicle Live. Retrieved November 28, 2021. Etymology The name ''Cheviot'', which was first documented in 1181 as ''Chiuiet'', is probably of[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratheden Group
The Stratheden Group is a Devonian lithostratigraphic group (a sequence of rock strata) in southern Scotland and northernmost England. Occasionally pebbly, this red-brown and yellow sandstone dominated unit also contains siltstones and mudstones. It is encountered in Arran in the west and across the Midland Valley to the northeastern parts of Fife Fife (, ; gd, Fìobha, ; sco, Fife) is a council area, historic county, registration county and lieutenancy area of Scotland. It is situated between the Firth of Tay and the Firth of Forth, with inland boundaries with Perth and Kinross (i ... in the east. The name is derived from Stratheden, Fife, Stratheden in Fife. The rocks of the Stratheden Group have also previously been referred to as the Upper Old Red Sandstone. It unconformably overlies a variety of other rock sequences including the Strathmore Group around Dumbarton, Stirling and Arran and the Arbuthnott-Garvock Group in Fife and the Kinross area. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Byrness
Byrness is a village within Rochester, Northumberland, Rochester civil parish in Northumberland, England. It is approximately north-west of Newcastle upon Tyne on the A68 road, A68, and is the last village in England before the A68 climbs the Cheviot Hills to cross Carter Bar into Scotland. Byrness's village church features a stained-glass window commemorating the workers who died during the building of Catcleugh Reservoir nearby. Much of the village was built by the Forestry Commission to house workers for the extensive forests that surround it. Situated on the Pennine Way, Byrness has an inn (Forest View), campsite and other accommodation offering rest and sustenance for weary walkers. History In the 17th century Byrness was located in the shieling grounds of the upper Rede valley and there is little or no evidence of permanent post-medieval habitation. By the latter part of the 18th century, John Hodgson (antiquary), Hodgson reported that there was a burial ground in the are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riccarton Group
The Riccarton Group is a Silurian lithostratigraphic group (a sequence of rock strata) in southern Scotland and northern England. The name is derived from Riccarton in the Edinburgh Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 Council areas of Scotland, council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian ... area. The rocks of the Riccarton Group have also previously been known as the Riccarton Formation and the Riccarton and Raeberry Castle Beds. The Group comprises around 500m thickness of greywackes, mudstones and siltstones which are faulted and folded. References * {{Refend Silurian System of Europe Geology of England Geology of Scotland Geological groups of the United Kingdom Geologic formations of the United Kingdom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silurian
The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozoic Era. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by a few million years. The base of the Silurian is set at a series of major Ordovician–Silurian extinction events when up to 60% of marine genera were wiped out. One important event in this period was the initial establishment of terrestrial life in what is known as the Silurian-Devonian Terrestrial Revolution: vascular plants emerged from more primitive land plants, dikaryan fungi started expanding and diversifying along with glomeromycotan fungi, and three groups of arthropods (myriapods, arachnids and hexapods) became fully terrestrialized. A significant evolutionary milestone during ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
