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Pastoral Period
Pastoral rock art is the most common form of Central Saharan rock art, created in painted and engraved styles depicting pastoralists and bow-wielding hunters in scenes of animal husbandry, along with various animals (e.g., cattle, sheep, goats, dogs), spanning from 6300 BCE to 700 BCE. The Pastoral Period is preceded by the Round Head Period and followed by the Caballine Period. The Early Pastoral Period spanned from 6300 BCE to 5400 BCE. Domesticated cattle were brought to the Central Sahara (e.g., Tadrart Acacus), and given the opportunity for becoming socially distinguished, to develop food surplus, as well as to acquire and aggregate wealth, led to the adoption of a cattle pastoral economy by some Central Saharan hunter-gatherers of the Late Acacus. In exchange, cultural information regarding utilization of vegetation (e.g., Cenchrus, Digitaria) in the Central Sahara (e.g., Uan Tabu, Uan Muhuggiag) was shared by Late Acacus hunter-gatherers with incoming Early Pastoral peop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Takarkori
Takarkori is an archaeological site and rock shelter located in the Acacus Mountains, Tadrart Acacus Mountains of southwestern Libya. During the Holocene, humans occupied the site between 10,170 cal BP and 4650 cal BP. Takarkori rockshelter is one of two sites where the earliest evidence of plant processing in pottery has been found, is the first Saharan site where ancient DNA was able to be extracted, particularly from two interred individuals, and is also a site with artifacts which include bone tools, stone tools, wooden tools, pottery, fiber goods, and carved figurines. Geography The Takarkori rockshelter is located in a valley within the Acacus Mountains, Tadrart Acacus Mountains. To the west of the rockshelter lies the Erg Takarkori, a stretch of sand dunes. The valley that the rockshelter is situated in is called Wadi Takarkori, which separates the Algerian and Libyan Acacus Mountains and is also the central point between two basins. Takarkori rockshelter lies near Libya's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conceptual Model
The term conceptual model refers to any model that is formed after a wikt:concept#Noun, conceptualization or generalization process. Conceptual models are often abstractions of things in the real world, whether physical or social. Semantics, Semantic studies are relevant to various stages of process of concept formation, concept formation. Semantics is fundamentally a study of concepts, the meaning that thinking beings give to various elements of their experience. Overview Concept models and conceptual models The value of a conceptual model is usually directly proportional to how well it corresponds to a past, present, future, actual or potential state of affairs. A concept model (a model of a concept) is quite different because in order to be a good model it need not have this real world correspondence. In artificial intelligence, conceptual models and conceptual graphs are used for building expert systems and knowledge-based systems; here the analysts are concerned to repres ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circular Logic
Circular reasoning (, "circle in proving"; also known as circular logic) is a logical fallacy in which the reasoner begins with what they are trying to end with. Circular reasoning is not a formal logical fallacy, but a pragmatic defect in an argument whereby the premises are just as much in need of proof or evidence as the conclusion. As a consequence, the argument becomes a matter of faith and fails to persuade those who do not already accept it. Other ways to express this are that there is no reason to accept the premises unless one already believes the conclusion, or that the premises provide no independent ground or evidence for the conclusion. Circular reasoning is closely related to begging the question, and in modern usage the two generally refer to the same thing. Circular reasoning is often of the form: "A is true because B is true; B is true because A is true." Circularity can be difficult to detect if it involves a longer chain of propositions. An example of circular ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desiccation
Desiccation is the state of extreme dryness, or the process of extreme drying. A desiccant is a hygroscopic (attracts and holds water) substance that induces or sustains such a state in its local vicinity in a moderately sealed container. The word desiccation comes . Industry Desiccation is widely employed in the oil and gas industry. These materials are obtained in a hydrated state, but the water content leads to corrosion or is incompatible with downstream processing. Removal of water is achieved by cryogenics, cryogenic condensation, absorption into glycols, and absorption onto desiccants such as silica gel. Laboratory A desiccator is a heavy glass or plastic container, now somewhat antiquated, used in practical chemistry for drying or keeping small amounts of materials very dry. The material is placed on a shelf, and a drying agent or ''desiccant'', such as dry silica gel or anhydrous sodium hydroxide, is placed below the shelf. Often some sort of humidity indicator is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Green Sahara
The African humid period (AHP; also known by other names) was a climate period in Africa during the late Pleistocene and Holocene geologic epochs, when northern Africa was wetter than today. The covering of much of the Sahara desert by grasses, trees and lakes was caused by changes in the Earth's axial tilt, changes in vegetation and dust in the Sahara which strengthened the African monsoon, and increased greenhouse gases. During the preceding Last Glacial Maximum, the Sahara contained extensive dune fields and was mostly uninhabited. It was much larger than today, and its lakes and rivers such as Lake Victoria and the White Nile were either dry or at low levels. The humid period began about 14,600–14,500 years ago at the end of Heinrich event 1, simultaneously to the Bølling–Allerød warming. Rivers and lakes such as Lake Chad formed or expanded, glaciers grew on Mount Kilimanjaro and the Sahara retreated. Two major dry fluctuations occurred; during the Younger Dryas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cattle
Cattle (''Bos taurus'') are large, domesticated, bovid ungulates widely kept as livestock. They are prominent modern members of the subfamily Bovinae and the most widespread species of the genus '' Bos''. Mature female cattle are called cows and mature male cattle are bulls. Young female cattle are called heifers, young male cattle are oxen or bullocks, and castrated male cattle are known as steers. Cattle are commonly raised for meat, for dairy products, and for leather. As draft animals, they pull carts and farm implements. Cattle are considered sacred animals within Hinduism, and it is illegal to kill them in some Indian states. Small breeds such as the miniature Zebu are kept as pets. Taurine cattle are widely distributed across Europe and temperate areas of Asia, the Americas, and Australia. Zebus are found mainly in India and tropical areas of Asia, America, and Australia. Sanga cattle are found primarily in sub-Saharan Africa. These types, sometime ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Round Head Rock Art
Round Head rock art is the earliest Cave painting, painted, monumental form of Central Saharan rock art, which was largely created from 9500 BP to 7500 BP and ceased being created by 3000 BP. The Round Head Period is preceded by the Kel Essuf Period and followed by the Pastoral Period. Round Head rock art number up to several thousand depictions in the Central Sahara. Human and undomesticated animal (e.g., Barbary sheep, antelope) artforms are usually portrayed, with a variety of details (e.g., African dance, dancing, Traditional African religions#Ceremonies, ceremonies, Traditional African masks, masks, spiritual animal forms), in painted Round Head rock art. Painted Round Head rock art and engraved Kel Essuf rock art usually share the same region and occasionally the same rockshelters. The Round Head rock art of Tassili and the surrounding mountainous areas bear considerable similarity with traditional Sub-Saharan Africa#Culture, Sub-Saharan African cultures. At the start of 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motif (visual Arts)
In art and iconography, a motif () is an element of an image. Motifs can occur both in figurative and narrative art, and in ornament and geometrical art. A motif may be repeated in a pattern or design, often many times, or may just occur once in a work. A motif may be an element in the iconography of a particular subject or type of subject that is seen in other works, or may form the main subject, as the Master of Animals motif in ancient art typically does. The related motif of confronted animals is often seen alone, but may also be repeated, for example in Byzantine silk and in other ancient textiles. Where the main subject of an artistic work - such as a painting - is a specific person, group, or moment in a narrative, that should be referred to as the "subject" of the work, not a motif, though the same thing may be a "motif" when part of another subject, or part of a work of decorative art - such as a painting on a vase. Ornament (art), Ornamental or decorative art ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pastoral Period
Pastoral rock art is the most common form of Central Saharan rock art, created in painted and engraved styles depicting pastoralists and bow-wielding hunters in scenes of animal husbandry, along with various animals (e.g., cattle, sheep, goats, dogs), spanning from 6300 BCE to 700 BCE. The Pastoral Period is preceded by the Round Head Period and followed by the Caballine Period. The Early Pastoral Period spanned from 6300 BCE to 5400 BCE. Domesticated cattle were brought to the Central Sahara (e.g., Tadrart Acacus), and given the opportunity for becoming socially distinguished, to develop food surplus, as well as to acquire and aggregate wealth, led to the adoption of a cattle pastoral economy by some Central Saharan hunter-gatherers of the Late Acacus. In exchange, cultural information regarding utilization of vegetation (e.g., Cenchrus, Digitaria) in the Central Sahara (e.g., Uan Tabu, Uan Muhuggiag) was shared by Late Acacus hunter-gatherers with incoming Early Pastoral peop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kel Essuf Period
Kel Essuf rock art is the earliest form of Petroglyph, engraved anthropomorphic Central Saharan rock art, which was produced prior to 9800 BP, at least as early as 12,000 BP amid the Late Pleistocene, late period of the Pleistocene. The Kel Essuf Period is preceded by the Bubaline Period and followed by the Round Head Period. Kel Essuf rock art usually depicts oval-shaped artforms, which possess four short appendages – two upper appendages, or arms, that may have between three and four finger-like digits, and two lower appendages, or legs – as well as an additional appendage, or penile appendage, without finger-like digits, which may be indicative of maleness. Concealed remnants of dismantled furnishing, furnished flooring are found in 75% of the Central Saharan rockshelters where Kel Essuf rock artforms are found. The furnished flooring in these rockshelters were likely created for the purpose of rainwater harvesting, collecting water and were subsequently dismantled after the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bubaline Period
Bubalus, Bubaline, or Large Wild Fauna rock art is the earliest form of Central Saharan rock art, created in an engraved style, which have been dated between 12,000 BCE and 8000 BCE. The Bubaline Period is followed by the Kel Essuf Period. As the animal world is particularly emphasized in Bubaline rock art, animal depictions are usually shown in larger scale than human depictions. Bubaline rock art portrays a few geometric designs and naturalistic outlined depictions of animals, such as antelope, aurochs, buffalos ( Bubalus antiquus/ Syncerus complexus), donkeys, elephants, fish (e.g., catfish, Nile perch), giraffes, hippopotamuses, ostriches, and rhinoceroses. Classifications Rock art is categorized into different groups (e.g., Bubaline, Kel Essuf, Round Heads, Pastoral, Caballine, Cameline), based on a variety of factors (e.g., art method, organisms, motifs, superimposed). In 5000 BP, buffalo ( Bubalus antiquus) in Africa underwent mass extinction; consequently, the engrav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
