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Adrar Plateau
The Adrar (, Berber for "mountain") is a highland natural and historical region of the Sahara Desert in northern Mauritania. The Adrar Region, an administrative division of Mauritania, is named after the traditional region. It is sometimes called Adrar Tamar to distinguish it from other areas called Adrar in the Sahara. Geography The Adrar is an arid plateau, known for its gorges, regs (stony deserts) and sand dunes. Structurally the Adrar is a low central massif which rises to over above sea level just east of Atar near the Amojjar Pass on the track to Chinguetti, then loses elevation and becomes subsumed by dunes to the south and east. Limited cultivation is only possible in the gorges at lower elevations such like oued Seguellil where the water table is high enough to support large palm groves. Notable features include the Oued el Abiod or 'White Valley', a dune-filled fault line along which many small settlements and palm groves are found. The Guelb Aouelloul crater i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desert Pavement
A desert pavement, also called reg (in the western Sahara), serir (eastern Sahara), gibber (in Australia), or saï (central Asia) is a desert surface covered with closely packed, interlocking angular or rounded rock fragments of pebble and cobble size. They typically top alluvial fans. Desert varnish collects on the exposed surface rocks over time. Geologists debate the mechanics of pavement formation and their age. Formation Several theories have been proposed for the formation of desert pavements. A common theory suggests that they form through the gradual removal of sand, dust and other fine-grained material by the wind and intermittent rain, leaving the larger fragments behind. The larger fragments are shaken into place through the forces of rain, running water, wind, gravity, creep, thermal expansion and contraction, wetting and drying, frost heaving, animal traffic, and the Earth's constant microseismic vibrations. The removal of small particles by wind does not conti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Théodore Monod
Théodore André Monod (9 April 1902 – 22 November 2000) was a French naturalist, humanist, scholar and explorer. Exploration Early in his career, Monod was made professor at the ''Muséum national d'histoire naturelle'' and founded the '' Institut fondamental d’Afrique noire'' in Senegal. He became a member of the '' Académie des sciences d'outre-mer'' in 1949, member of the ''Académie de marine'' in 1957 and member of the ''Académie des sciences'' in 1963. In 1960, he became one of the founders of the ''World Academy of Art and Science''. He began his career in Africa with the study of monk seals on Mauritania's Cap Blanc peninsula. However, he soon turned his attention to the Sahara desert, which he would survey for more than sixty years in search of meteorites. Though he failed to find the meteorite he sought, he discovered numerous plant species as well as several important Neolithic sites. Perhaps his most important find (together with Wladimir Besnard) was the Assel ... [...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] |
Henna
Henna is a dye prepared from the plant ''Lawsonia inermis'', also known as the henna tree, the mignonette tree, and the Egyptian privet, the sole species of the genus ''Lawsonia''. ''Henna'' can also refer to the temporary body art resulting from the staining of the skin from the dyes. After henna stains reach their peak color, they hold for a few days, then gradually wear off by way of exfoliation, typically within one to three weeks. Henna has been used since antiquity in ancient Egypt and Indian subcontinent to dye skin, hair and fingernails, as well as fabrics including silk, wool, and leather. Historically, henna was used in West Asia including the Arabian Peninsula and in Carthage, other parts of North Africa, West Africa, Central Africa, the Horn of Africa and the Indian subcontinent. The name "henna" is used in other skin and hair dyes, such as ''black henna'' and ''neutral henna'', neither of which is derived from the henna plant. Etymology The English name "henna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tagant Plateau
The Tagant Plateau is located in eastern Mauritania, forming a stony part of the Sahara Desert. The Tagant Region, a national administrative division, is named after the plateau. Geography Some towns are located at the foot of the Tagant Plateau's slopes, which form cliffs in some places. Among these areas are Tichit, Moudjéria and Rachid. Tidjikdja lies on the Tagant itself. The Assaba Massif, where Late Ordovician glacial formations have been identified, is a southward prolongation of the Tagant plateau. The Aoukar, the dry basin of a former lake lies beyond of the southern escarpments of the Tagant Plateau. History Beginning in mid-17th century, migrants from the Adrar Plateau region moved in and displaced the native population of the Tagant Plateau. The Tartega Gueltas oasis is one of the few wetlands in the region where there were still desert crocodiles in 1976, but the population seems to have been last seen in 1996. See also *Dhar Tichitt *Geography of Mauritania ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Azougui
Azougui (or Azuggi, ar, آزوكي) was a town in north western Mauritania, lying on the Adrar Plateau, north west of Atar. In the eleventh century it was the first capital of the Almoravid dynasty, who conquered a territory stretching from the Ghana Empire to Morocco and the Iberian Peninsula. The chronicler al-Bakri claims a fortress "surrounded by 20,000 palms" was built here by Yannu ibn Umar, a brother of the first Almoravid chieftains, Yahya ibn Umar al-Lamtuni and Abu Bakr ibn Umar, and marked the frontier between the dominions of the Lamtuna and the Gudala. Both of them Berber Sanhaja desert tribes and one time allies, the Lamtuna formed the core of the Almoravids after the Gudala broke away. It was near this location, at a place called Tabfarilla, that the early Almoravids suffered their first significant defeat, when the Gudala crushed an Almoravid Lamtuna army based in Azuggi and killed their leader Yahya ibn Umar in 1056. Azuggi and the nearby battlefield s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stone Circle
A stone circle is a ring of standing stones. Most are found in Northwestern Europe – especially in Britain, Ireland, and Brittany – and typically date from the Late Neolithic and Early Bronze Age, with most being built from 3000 BC. The best known examples include those at the henge monument at Avebury, the Rollright Stones, and elements within the ring of standing stones at Stonehenge. Scattered examples exist from other parts of Europe. Later, during the Iron Age, stone circles were built in southern Scandinavia. Stone circles are usually grouped in terms of the shape and size of the stones, the span of their radius, and their population within the local area. Although many theories have been advanced to explain their use, usually related to providing a setting for ceremony or ritual, no consensus exists among archaeologists regarding their intended function. Their construction often involved considerable communal effort, including specialist tasks such as planning, quar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeology
Archaeology or archeology is the scientific study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, sites, and cultural landscapes. Archaeology can be considered both a social science and a branch of the humanities. It is usually considered an independent academic discipline, but may also be classified as part of anthropology (in North America – the four-field approach), history or geography. Archaeologists study human prehistory and history, from the development of the first stone tools at Lomekwi in East Africa 3.3 million years ago up until recent decades. Archaeology is distinct from palaeontology, which is the study of fossil remains. Archaeology is particularly important for learning about prehistoric societies, for which, by definition, there are no written records. Prehistory includes over 99% of the human past, from the Paleolithic until the adven ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arid
A region is arid when it severely lacks available water, to the extent of hindering or preventing the growth and development of plant and animal life. Regions with arid climates tend to lack vegetation and are called xeric or desertic. Most arid climates straddle the Equator; these regions include parts of Africa, Asia, South America, North America, and Australia. Change over time The distribution of aridity at any time is largely the result of the general circulation of the atmosphere. The latter does change significantly over time through climate change. For example, temperature increase by 1.5–2.1 percent across the Nile Basin over the next 30–40 years could change the region from semi-arid to arid, significantly reducing the land usable for agriculture. In addition, changes in land use can increase demands on soil water and thereby increase aridity. See also * Arid Forest Research Institute * Aridity index * Desert climate * Desiccation tolerance * Drought * Hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agrour Amogjar
The Agrour Amogjar is a 690 m high peak near the Amogjar Pass, in the Adrar plateau of central Mauritania. Its small natural shelters house a rich collection of rock painting In archaeology, rock art is human-made markings placed on natural surfaces, typically vertical stone surfaces. A high proportion of surviving historic and prehistoric rock art is found in caves or partly enclosed rock shelters; this type also ...s in a damaged state. An enclosure protects some of the shelters and access is subject to a fee. Rock paintings The set of rock paintings is heterogeneous. Eight stylistic groups have been recorded, ranging from the "pastoral" period to the most recent graffiti. The panels are featuring geometric circles with sunburst design, handprints, naturalistic wildlife such as giraffe, lion and crocodile, as well as herds of cattle and human collective scenes. The most important set is a frieze of dancers.Robert Vernet, Les peintures rupestres du haut de la passe d'Amogj ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neolithic
The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several parts of the world. This "Neolithic package" included the introduction of farming, domestication of animals, and change from a hunter-gatherer lifestyle to one of settlement. It began about 12,000 years ago when farming appeared in the Epipalaeolithic Near East, and later in other parts of the world. The Neolithic lasted in the Near East until the transitional period of the Chalcolithic (Copper Age) from about 6,500 years ago (4500 BC), marked by the development of metallurgy, leading up to the Bronze Age and Iron Age. In other places the Neolithic followed the Mesolithic (Middle Stone Age) and then lasted until later. In Ancient Egypt, the Neolithic lasted until the Protodynastic period, 3150 BC.Karin Sowada and Peter Grave. Egypt in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Encyclopædia Britannica
The (Latin for "British Encyclopædia") is a general knowledge English-language encyclopaedia. It is published by Encyclopædia Britannica, Inc.; the company has existed since the 18th century, although it has changed ownership various times through the centuries. The encyclopaedia is maintained by about 100 full-time editors and more than 4,000 contributors. The 2010 version of the 15th edition, which spans 32 volumes and 32,640 pages, was the last printed edition. Since 2016, it has been published exclusively as an online encyclopaedia. Printed for 244 years, the ''Britannica'' was the longest running in-print encyclopaedia in the English language. It was first published between 1768 and 1771 in the Scottish capital of Edinburgh, as three volumes. The encyclopaedia grew in size: the second edition was 10 volumes, and by its fourth edition (1801–1810) it had expanded to 20 volumes. Its rising stature as a scholarly work helped recruit eminent con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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