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Sneeuwberg
The Sneeuberge or Sneeuberg mountain range was historically known as “Sneeuwbergen”, meaning ‘snow mountains’ in Cape Dutch, and refers to a significant portion of Southern Africa's Great Escarpment in the Cradock, Murraysburg, Richmond, Graaff-Reinet, Nieu-Bethesda and Middelburg districts of the Great Karoo, most of which are in the Eastern Cape Province.Clark, VR, Barker NP and Mucina, L. 2009. The Sneeuberg: A new centre of floristic endemism on the Great Escarpment, South Africa. South African Journal of Botany. pp 196 – 238. They are geologically part of the Karoo System and fall within the Karoo semi-arid climatic region. As their name suggests, the mountains have frigid winters, with occasional snowfalls during strong cold fronts. Summers are hot with some late afternoon thunderstorms. The highest peak, called Kompasberg (2502m) (Afrikaans for Compass Mountain), is north of the small village of Nieu-Bethesda and dominates all surrounding areas with its prom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burchell02
Burchell is a surname and more rarely a given name. It may refer to: People Surname * Beau Burchell (born 1978), American musician and record producer * Charles Jost Burchell (1876–1967), Canadian diplomat * David Godwin Burchell (1924–2009), South Australian businessman, recreational scuba diver and Australian rules football administrator * Francis Burchell (1874–1947), English cricketer * Fred Burchell (baseball) (1879–1951), American baseball pitcher * Fred Burchell (ice hockey) (1931–1998), Canadian ice hockey player * Hannah Burchell (born 1995), Australian rules footballer * Jamie Burchell (born 1979), British basketball player * Joe Burchell (1873–1932), English football manager * Reginald Burchell (1883–1955), Australian politician * Remona Burchell (born 1991), Jamaican sprinter * Thomas Burchell (1799–1846), Baptist missionary and slavery abolitionist in Jamaica * Thomas Burchell (cricketer) (1875–1951), English cricketer * William John Burchell (1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sill (geology)
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 a sill does not cut across preexisting rock beds. Stacking of sills builds a sill complex . and a large magma chamber at high magma flux. In contrast, a dike is a discordant intrusive sheet, which does cut across older rocks. Sills are fed by dikes, except in unusual locations where they form in nearly vertical beds attached directly to a magma source. The rocks must be brittle and fracture to create the planes along which the magma intrudes the parent rock bodies, whether this occurs along preexisting planes between sedimentary or volcanic beds or weakened planes related to foliation in metamorphic rock. These planes or weakened areas allow the intrusion of a thin sheet-like body of magma paralleling the existing beddin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Fish River
The Great Fish River (called ''great'' to distinguish it from the Namibian Fish River) ( af, Groot-Visrivier) is a river running through the South African province of the Eastern Cape. The coastal area between Port Elizabeth and the Fish River mouth is known as the ''Sunshine Coast''. The Great Fish River was originally named ''Rio do Infante'', after João Infante, the captain of one of the caravels of Bartolomeu Dias. Infante visited the river in the late 1480s. The name Great Fish is also a misnomer, since it is a translation of the Dutch Groot Visch Rivier, which was the name of a tributary in the vicinity of Cradock, which at its confluence with the Little Fish (Klein Visch Rivier) forms what is properly called the (Eastern Cape) Fish River. Course The Great Fish River originates east of Graaff-Reinet and runs through Cradock. Further south the Tarka River joins its left bank. Thence it makes a zig-zag turn to Cookhouse, from where it meanders down the escarpment eas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compassberg
Compassberg ( af, Kompasberg), is a mountain peak of the Sneeuberge range in South Africa. It is located 55 km due north of Graaff-Reinet in the Eastern Cape Province. At 2504 metres, it is the highest peak in South Africa outside the Stormberg-Drakensberg massif. It was named by Colonel Robert Jacob Gordon when he accompanied Governor Joachim van Plettenberg on a journey to the eastern frontier of the Cape Colony in 1778. The mountain is composed of sediments of the Beaufort Series in the Karoo System, and extensively intruded by dolerite Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained ... dikes and sills. References External links *{{cite web, title=''Compassberg'', work=South African Hikes, url=http://www.sahikes.co.za/Details.asp?TrailID=38, accessdate=2010-09-03, archiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drakensberg
The Drakensberg (Afrikaans: Drakensberge, Zulu: uKhahlambha, Sotho: Maluti) is the eastern portion of the Great Escarpment, which encloses the central Southern African plateau. The Great Escarpment reaches its greatest elevation – within the border region of South Africa and Lesotho. The Drakensberg escarpment stretches for more than from the Eastern Cape Province in the South, then successively forms, in order from south to north, the border between Lesotho and the Eastern Cape and the border between Lesotho and KwaZulu-Natal Province. Thereafter it forms the border between KwaZulu-Natal and the Free State, and next as the border between KwaZulu-Natal and Mpumalanga Province. The escarpment winds north from there, through Mpumalanga, where it includes features such as the Blyde River Canyon, Three Rondavels, and God's Window. It then extends farther north to Hoedspruit in southeastern Limpopo where it is known as 'Klein Drakensberg' by the Afrikaner. From Hoedsp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartzite
Quartzite is a hard, non- foliated metamorphic rock which was originally pure quartz sandstone.Essentials of Geology, 3rd Edition, Stephen Marshak, p 182 Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts. Pure quartzite is usually white to grey, though quartzites often occur in various shades of pink and red due to varying amounts of hematite. Other colors, such as yellow, green, blue and orange, are due to other minerals. The term ''quartzite'' is also sometimes used for very hard but unmetamorphosed sandstones that are composed of quartz grains thoroughly cemented with additional quartz. Such sedimentary rock has come to be described as orthoquartzite to distinguish it from metamorphic quartzite, which is sometimes called metaquartzite to emphasize its metamorphic origins. Quartzite is very resistant to chemical weathering and often forms ridges and resistant hilltops. The nearly pure silica co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hornfels
Hornfels is the group name for a set of contact metamorphic rocks that have been baked and hardened by the heat of intrusive igneous masses and have been rendered massive, hard, splintery, and in some cases exceedingly tough and durable. These properties are due to fine grained non-aligned crystals with platy or prismatic habits, characteristic of metamorphism at high temperature but without accompanying deformation. The term is derived from the German word ''Hornfels'', meaning "hornstone", because of its exceptional toughness and texture both reminiscent of animal horns. These rocks were referred to by miners in northern England as whetstones. Most hornfels are fine-grained, and while the original rocks (such as sandstone, shale, slate and limestone) may have been more or less fissile owing to the presence of bedding or cleavage planes, this structure is effaced or rendered inoperative in the hornfels. Though many hornfels show vestiges of the original bedding, they break ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metamorphic Rock
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock ( protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, causing profound physical or chemical changes. During this process, the rock remains mostly in the solid state, but gradually recrystallizes to a new texture or mineral composition. The protolith may be an igneous, sedimentary, or existing metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by their protolith, their chemical and mineral makeup, and their texture. They may be formed simply by being deeply buried beneath the Earth's surface, where they are subject to high temperatures and the great pressure of the rock layers above. They can also form from tectonic processes such as continental collisions, which cause horizontal pressure, friction, and di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karoo Supergroup
The Karoo Supergroup is the most widespread stratigraphic unit in Africa south of the Kalahari Desert. The supergroup consists of a sequence of units, mostly of nonmarine origin, deposited between the Late Carboniferous and Early Jurassic, a period of about 120 million years. In southern Africa, rocks of the Karoo Supergroup cover almost two thirds of the present land surface, including all of Lesotho, almost the whole of Free State, and large parts of the Eastern Cape, Northern Cape, Mpumalanga and KwaZulu-Natal Provinces of South Africa. Karoo supergroup outcrops are also found in Namibia, Eswatini, Zambia, Zimbabwe and Malawi, as well as on other continents that were part of Gondwana. The basins in which it was deposited formed during the formation and breakup of Pangea.McCarthy, T., Rubridge, B. (2005). ''The Story of Earth and Life.'' pp. 161, 187–241. Struik Publishers, Cape Town The type area of the Karoo Supergroup is the Great Karoo in South Africa, where th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mudstone
Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility (parallel layering).Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, W. H. Freeman, 2nd ed, 529 pp. The term ''mudstone'' is also used to describe carbonate rocks ( limestone or dolomite) that are composed predominantly of carbonate mud. However, in most contexts, the term refers to siliciclastic mudstone, composed mostly of silicate minerals. The NASA Curiosity rover has found deposits of mudstone on Mars that contain organic substances such as propane, benzene and toluene. Definition There is not a single definition of mudstone that has gained general acceptance,Boggs 2006, p.143 though there is wide agreement that mudstones are fine-grained sedimentary rocks, composed mostly of silicate grains with a grain size less than . Individual grains this size are too small to be distin ... [...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 r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaufort Group
The Beaufort Group is the third of the main subdivisions of the Karoo Supergroup in South Africa. It is composed of a lower Adelaide Subgroup and an upper Tarkastad Subgroup. It follows conformably after the Ecca Group and unconformably underlies the Stormberg Group. Based on stratigraphic position, lithostratigraphic and biostratigraphic correlations, palynological analyses, and other means of geological dating, the Beaufort Group rocks are considered to range between Middle Permian ( Wordian) to Early Triassic (Anisian) in age. Background During the period when sedimentation of the Beaufort Group rocks took place, the Ecca sea had retreated to the northeastern Karoo Basin. All sediment deposition at this time took place in a terrestrial, although in a predominantly fluvial or alluvial environment that was seasonally arid. This environment covered a vast area and deposition was influenced by a retroarc foreland basin. This foreland system was caused by crustal uplift ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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