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Great Rigg
Great Rigg is a fell in the English Lake District, 7 kilometres (4½ miles) north-west of Ambleside and reaching a height of 766 metres (2,513 feet). It is most often climbed as part of the Fairfield horseshoe, a 16-km circular walk which starts and finishes in Ambleside. The fell's name originates from the Old English "Rigg", meaning a bumpy or knobbly ridge. Topography Great Rigg is mostly without merit, being just an undulation on one of Fairfield's southern ridges; with 31 metres of prominence it just qualifies as a Hewitt. It is best seen from the south-west near Grasmere where from that angle its summit seems to dominate the valley. The fell is rocky on its eastern side as Stone Cove drops to Rydal Beck; on its western flank it is mostly grassy as it falls away to Tongue Gill; to the north and south are ridges which continue to other fells, with Fairfield being 1.5 kilometres (0.9 miles) away to the north while Heron Pike lies 2.5 kilometres (1.6 miles) to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heron Pike
Heron Pike is a fell in the English Lake District, two kilometres east of Grasmere. It is part of the Fairfield group in the Eastern Fells. It should not be confused with the Heron Pike that forms part of Sheffield Pike, although it appears that, by coincidence, both Heron Pikes are exactly the same height. Topography Not a fell of great significance, Heron Pike is a slight grassy rise on the long southern ridge of its parent fell Fairfield. Just cresting the 2,000 foot mark at 612 m (2,008 ft), it is mostly climbed as part of the Fairfield horseshoe walk and it lies between the adjoining fells of Nab Scar and Great Rigg. Heron Pike’s eastern side features Erne Crag and Blind Cove as it falls away quite steeply towards Rydal Beck. At the base of Erne Crag is an old quarry, the mouth of a cavern quite easy to locate.Richards, Mark: ''Near Eastern Fells'': Collins (2003): The fell's western flank drops towards Grasmere and has the small Alcock Tarn on its low ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fairfield (Lake District)
Fairfield is a fell in the English Lake District. It is the highest of a group of hills in the Eastern Fells, standing to the south of the Helvellyn range. Topography There is a marked contrast between the character of the northern and southern flanks of Fairfield. Alfred Wainwright in his influential ''Pictorial Guide to the Lakeland Fells'' wrote that ''"From the south it appears as a great horseshoe of grassy slopes below a consistently high skyline...but lacking those dramatic qualities that appeal most to the lover of hills. But on the north side the Fairfield range is magnificent: here are dark precipices, long fans of scree...desolate combes and deep valleys."''Alfred Wainwright:''A Pictorial Guide to the Lakeland Fells'', Book 1: Fairfield has connecting ridges to several other fells and in plan view can be likened to a bow-tie. The top has an east–west axis with ridges running out north and south from each end. The two southern arms make up the popular walk, the Fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tarn (lake)
A tarn (or corrie loch) is a Proglacial lake, proglacial mountain lake, pond or pool, formed in a cirque excavated by a glacier. A moraine may form a natural dam below a tarn. Etymology The word is toponymy, derived from the Old Norse word ''tjörn'' ("a small mountain lake without tributaries") meaning pond. In parts of Northern England - predominantly Cumbria but also areas of North Lancashire and North Yorkshire - 'tarn' is widely used as the name for small lakes or ponds, regardless of their location and origin (e.g. Talkin Tarn, Urswick Tarn, Malham Tarn). Similarly, in Scandinavian languages, a ''tjern'' or ''tjørn'' (both Norwegian) or ''tjärn'' or ''tärn'' (both Swedish) is a small natural lake, often in a forest or with vegetation closely surrounding it or growing into the tarn. The specific technical use for a body of water in a glacial corrie comes from high number of tarns found in corries in the Lake District, an upland area in Cumbria. Nonetheless, there are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cairn
A cairn is a man-made pile (or stack) of stones raised for a purpose, usually as a marker or as a burial mound. The word ''cairn'' comes from the gd, càrn (plural ). Cairns have been and are used for a broad variety of purposes. In prehistoric times, they were raised as markers, as memorials and as burial monuments (some of which contained chambers). In modern times, cairns are often raised as landmarks, especially to mark the summits of mountains. Cairns are also used as trail markers. They vary in size from small stone markers to entire artificial hills, and in complexity from loose conical rock piles to elaborate megalithic structures. Cairns may be painted or otherwise decorated, whether for increased visibility or for religious reasons. A variant is the inuksuk (plural inuksuit), used by the Inuit and other peoples of the Arctic region of North America. History Europe The building of cairns for various purposes goes back into prehistory in Eurasia, ranging in s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seat Sandal
Seat Sandal is a fell in the English Lake District, situated four kilometres (2½ miles) north of the village of Grasmere from where it is very well seen. Nevertheless, it tends to be overshadowed by its more illustrious neighbours in the Eastern Fells, Helvellyn and Fairfield. Name The unusual name comes from the Old Norse language, '' " Sandulfr " '' being an Old Norse personal name. The name element '' ' Seat ' '' is from Old Norse '' ' sæter ' ''. Toponym * Sandulfr's sæter * Sandal's high summer pasture. Examples of place names with a similar etymology might include : * Seatoller , Borrowdale, Lake District : (Seat..oller ) '' " Óláfr’s sæter " '' * Seatallan , Wasdale, Lake District : (Seat..allan ) '' " Aleyn's sæter " '' The remains of structures have been found on Seat Sandal that are assumed to have been summer shielings (high altitude dwellings ) where people stayed during the summer months in order to watch over the animals. Both Seat Sanda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Geological Survey
The British Geological Survey (BGS) is a partly publicly funded body which aims to advance geoscientific knowledge of the United Kingdom landmass and its continental shelf by means of systematic surveying, monitoring and research. The BGS headquarters are in Keyworth, Nottinghamshire, England. Its other centres are located in Edinburgh, Wallingford, Cardiff and London. The current motto of the BGS is: ''Gateway to the Earth''. History and previous names The Geological Survey was founded in 1835 by the Board of Ordnance as the Ordnance Geological Survey, under Henry De la Beche. This was the world's first national geological survey. It remained a branch of the Ordnance Survey for many years. In 1965, it was merged with the Geological Museum and Overseas Geological Surveys, under the name of Institute of Geological Sciences. On 1 January 1984, the institute was renamed the British Geological Survey (and often referred to as the BGS), a name still carried today. Competenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuff
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous (for example, ''tuffaceous sandstone''). Tuff composed of sandy volcanic material can be referred to as volcanic sandstone. Tuff is a relatively soft rock, so it has been used for construction since ancient times. Because it is common in Italy, the Romans used it often for construction. The Rapa Nui people used it to make most of the ''moai'' statues on Easter Island. Tuff can be classified as either igneous or sedimentary rock. It is usually studied in the context of igneous petrology, although it is sometimes described using sedimentological terms. Tuff is often erroneously called tufa in guidebooks and in television programmes. Volcanic ash The material that is expelled in a volcanic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lapilli
Lapilli is a size classification of tephra, which is material that falls out of the air during a volcanic eruption or during some meteorite impacts. ''Lapilli'' (singular: ''lapillus'') is Latin for "little stones". By definition lapilli range from in diameter. A pyroclastic particle greater than 64 mm in diameter is known as a volcanic bomb when molten, or a volcanic block when solid. Pyroclastic material with particles less than 2 mm in diameter is referred to as volcanic ash. Formation Lapilli are spheroid-, teardrop-, dumbbell- or button-shaped droplets of molten or semi-molten lava ejected from a volcanic eruption that fall to earth while still at least partially molten. These granules are not accretionary, but instead the direct result of liquid rock cooling as it travels through the air. Lapilli tuffs are a very common form of volcanic rock typical of rhyolite, andesite and dacite pyroclastic eruptions, where thick layers of lapilli can be deposited during a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dacite
Dacite () is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. It has a fine-grained (aphanitic) to porphyritic texture and is intermediate in composition between andesite and rhyolite. It is composed predominantly of plagioclase feldspar and quartz. Dacite is relatively common, occurring in many tectonic settings. It is associated with andesite and rhyolite as part of the subalkaline volcanic rock, subalkaline tholeiite, tholeiitic and calc-alkaline magma series. Composition Dacite consists mostly of plagioclase feldspar and quartz with biotite, hornblende, and pyroxene (augite or enstatite). The quartz appears as rounded, corroded phenocrysts, or as an element of the ground-mass. The plagioclase in dacite ranges from oligoclase to andesine and labradorite. Sanidine occurs, although in small proportions, in some dacites, and when abundant gives rise to rocks that form rhyodacite, transitions to the rhyolites. The rel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually related to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcaniclastic
Volcaniclastics are geologic materials composed of broken fragments (clasts) of volcanic rock. These encompass all clastic volcanic materials, regardless of what process fragmented the rock, how it was subsequently transported, what environment it was deposited in, or whether nonvolcanic material is mingled with the volcanic clasts. The United States Geological Survey defines volcaniclastics somewhat more narrowly, to include only rock composed of volcanic rock fragments that have been transported some distance from their place of origin. In the broad sense of the term, volcaniclastics includes pyroclastic rocks such as the Bandelier Tuff; cinder cones and other tephra deposits; the basal and capping breccia that characterize ʻaʻā lava flows; and lahars and debris flows of volcanic origin.Vincent 2000, pp.27-28 Volcaniclastics make up more of the volume of many volcanoes than do lava flows. Volcaniclastics may have contributed as much as a third of all sedimentation in the geolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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