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90-622: Most of the southern side of the range is part of the Paratge Natural d'Interès Nacional de l'Albera natural reserve. There are some ancient megaliths in the range. The Col du Perthus marks the western boundary of the massif. The massif is at the eastern end of the "Axial Zone" of the Pyrenees mountain range. As in most of that zone, the geological formations in the massif are mostly of Paleozoic and earlier ages, with granite , gneiss , and schists (and other metasediments ) being

180-749: A Celtic stone cult. This unproven connection between druids and megaliths has haunted the public imagination ever since. In Belgium, there are the Wéris megaliths at Wéris, a little town situated in the Ardennes . In the Netherlands, megalithic structures can be found in the northeast of the country, mostly in the province of Drenthe . Knowth is a passage grave of the Brú na Bóinne neolithic complex in Ireland, dating from c. 3500–3000 BC. It contains more than

270-420: A laboratory or factory . Mining in a wider sense comprises extraction of any resource (e.g. petroleum , natural gas , salt or even water ) from the earth. Mining of rock and metals has been done since prehistoric times. Modern mining processes involve prospecting for mineral deposits, analysis of the profit potential of a proposed mine, extraction of the desired materials, and finally reclamation of

360-704: A broader range, running from west to east, from the Hautes-Pyrénées to the Canigou massif and the Vermeille coast, passing through Andorra. In the Albères massif, the two main groups of formations are metamorphosed formations of sedimentary origin (notably schists), and formations of plutonic origin (mainly granites and gneisses). On its northern slope, the Albères fault (which extends approximately from west to east from around Le Boulou to around Argelès) marks

450-626: A clear geological and topographical limit between the Paleozoic and older formations of the Massif des Albères and the Neogene deposits of the Roussillon basin. Of mainly siliceous geological origin, this massif produces acidic soils; hence the presence of maquis and not scrubland (present on limestone soils). Megalith A megalith is a large stone that has been used to construct

540-402: A fourth class of rocks alongside igneous, sedimentary, and metamorphic. Rock varies greatly in strength, from quartzites having a tensile strength in excess of 300 MPa to sedimentary rock so soft it can be crumbled with bare fingers (that is, it is friable ). (For comparison, structural steel has a tensile strength of around 350 MPa. ) Relatively soft, easily worked sedimentary rock

630-433: A huge impact on the cultural and technological development of the human race. Rock has been used by humans and other hominids for at least 2.5 million years . Lithic technology marks some of the oldest and continuously used technologies. The mining of rock for its metal content has been one of the most important factors of human advancement, and has progressed at different rates in different places, in part because of

720-641: A large flat stone supported by three, four, or more standing stones. They were covered by a stone cairn or earth barrow . In Italy, dolmens can be found especially in Sardinia . There are more than 100 dolmen dating to the Neolithic (3500–2700 BC) and the most famous is called Dolmen di Sa Coveccada (near Mores ). During the Bronze Age , the Nuragic civilization built c. 800 Giants' grave ,

810-518: A marker or foresight. In some areas, long and complex "alignments" of such stones exist, the largest known example being located at Carnac in Brittany , France. In parts of Britain and Ireland a relatively common type of megalithic construction is the stone circle , of which examples include Stonehenge , Avebury , Ring of Brodgar and Beltany . These, too, display evidence of astronomical alignments, both solar and lunar. Stonehenge, for example,

900-642: A number of old megaliths. Some of these ancient structures feature engravings, and the area is a World Heritage Site. Megaliths are also found within the Valley of Marvels in the East Hararghe area. In the mid-2nd millennium CE, the megalithic funerary monuments of Madagascar were constructed amid the emergent period of the Merina Kingdom . Some of the megaliths remain utilized by Malagasy -speakers for funerary practices (e.g., ceremony of turning

990-675: A prehistoric structure or monument, either alone or together with other stones. There are over 35,000 structures or arrangements in Europe alone, located widely from Sweden to the Mediterranean sea. The word was first used in 1849 by the British antiquarian Algernon Herbert in reference to Stonehenge and derives from the Ancient Greek words " mega " for great and " lithos " for stone. Most extant megaliths were erected between

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1080-616: A rectangular cist. An oversized capstone is placed over the stone slab burial chamber, giving the appearance of a table-top. These megalithic burials date to the early part of the Mumun pottery period (c. 1500–850 BC) and are distributed, with a few exceptions, north of the Han River . Few northern-style megaliths in North Korea and Manchuria contain grave goods such as Liaoning bronze daggers , prompting some archaeologists to interpret

1170-562: A source area and then transported to the place of deposition by water , wind , ice , mass movement or glaciers (agents of denudation ). About 7.9% of the crust by volume is composed of sedimentary rocks, with 82% of those being shales, while the remainder consists of 6% limestone and 12% sandstone and arkoses . Sedimentary rocks often contain fossils . Sedimentary rocks form under the influence of gravity and typically are deposited in horizontal or near horizontal layers or strata , and may be referred to as stratified rocks. Sediment and

1260-713: A texture are referred to as foliated ; the remainders are termed non-foliated. The name of the rock is then determined based on the types of minerals present. Schists are foliated rocks that are primarily composed of lamellar minerals such as micas . A gneiss has visible bands of differing lightness , with a common example being the granite gneiss. Other varieties of foliated rock include slates , phyllites , and mylonite . Familiar examples of non-foliated metamorphic rocks include marble , soapstone , and serpentine . This branch contains quartzite —a metamorphosed form of sandstone —and hornfels . Though most understanding of rocks comes from those of Earth, rocks make up many of

1350-542: A third of the total number of examples of megalithic art in all Europe, with over 200 decorated stones found during excavations. Nabta Playa at the southwest corner of the western Egyptian desert was once a large lake in the Nubian Desert, located 500 miles south of modern-day Cairo . By the 5th millennium BC, the peoples in Nabta Playa had fashioned an astronomical device that accurately marks

1440-580: A type of chamber tomb , and the term is used to describe the structures built across Atlantic Europe , the Mediterranean, and neighbouring regions, mostly during the Neolithic period, by Neolithic farming communities. They differ from the contemporary long barrows through their structural use of stone. There is a huge variety of megalithic tombs. The free-standing single chamber dolmens and portal dolmens found in Brittany , Denmark, Germany, Ireland, Netherlands, Sweden, Wales , and elsewhere consist of

1530-958: A type of megalithic gallery grave that can be found throughout Sardinia with different structures. The earliest megalithic tombs in Sardinia are the circular graves of the so-called Arzachena culture , also found in Corsica , southern France and eastern Spain. Dolmens are also in Apulia and in Sicily. In this latter region, they are small structures located in Mura Pregne ( Palermo ), Sciacca ( Agrigento ), Monte Bubbonia ( Caltanissetta ), Butera (Caltanissetta), Cava Lazzaro ( Siracusa ), Cava dei Servi ( Ragusa ), Avola (Siracusa), and Argimusco in Montalbano Elicona ( Messina ). Dating to

1620-464: Is a diverse group known as gallery graves . These are axially arranged chambers placed under elongated mounds. The Irish court tombs , British long barrows , and German Steinkisten belong to this group. Standing stones, or menhirs as they are known in France, are very common throughout Europe, where some 50,000 examples have been noted. Some of these are thought to have an astronomical function as

1710-631: Is famous for its solstice alignment. Examples of stone circles are also found in the rest of Europe. The circle at Lough Gur , near Limerick in Ireland has been dated to the Beaker period, approximately contemporaneous with Stonehenge. The stone circles are assumed to be of later date than the tombs, straddling the Neolithic and the Bronze Ages . Megalithic tombs are aboveground burial chambers, built of large stone slabs (megaliths) laid on edge and covered with earth or other, smaller stones. They are

1800-458: Is formed through the cooling and solidification of magma or lava . This magma may be derived from partial melts of pre-existing rocks in either a planet 's mantle or crust . Typically, the melting of rocks is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Igneous rocks are divided into two main categories: Magmas tend to become richer in silica as they rise towards

1890-534: Is in Korea. Archaeologists estimate that there are 15,000 to 100,000 southern megaliths in the Korean Peninsula. Typical estimates hover around the 30,000 mark for the entire peninsula, which in itself constitutes some 40% of all dolmens worldwide (see Dolmen ). Northeast Asian megalithic traditions originated from Gojoseon , which was in modern-day Manchuria and North Korea . This was prominent within

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1980-494: Is next in importance. About 65% of the Earth's crust by volume consists of igneous rocks. Of these, 66% are basalt and gabbro , 16% are granite, and 17% granodiorite and diorite . Only 0.6% are syenite and 0.3% are ultramafic . The oceanic crust is 99% basalt, which is an igneous rock of mafic composition. Granite and similar rocks, known as granitoids , dominate the continental crust . Sedimentary rocks are formed at

2070-559: Is placed over the interment area and is supported by smaller propping stones. Most of the megalithic burials on the Korean Peninsula are of the southern type. As with northern megaliths, southern examples contain few, if any, artifacts. However, a small number of megalithic burials contain fine red-burnished pottery, bronze daggers, polished groundstone daggers, and greenstone ornaments. Southern megalithic burials are often found in groups, spread out in lines that are parallel with

2160-531: Is that it may derive from the Latin Albaria by adding the collective suffix -aria to the adjective albus , meaning " white ". However, this explanation is considered unsatisfactory because the massif is not white in color. Rarely snow-covered, it likely did not show white rocks in the Middle Ages, as it was covered with forests. It could also come from alba , dawn, because it is the easternmost of

2250-557: Is that of Brahmagiri, which was excavated by Wheeler (1975) and helped establish the culture sequence in south Indian prehistory. However, there is another distinct class of megaliths that do not seem to be associated with burials. In South Asia, megaliths of all kinds are noted; these vary from menhirs , rock-cut burial, chamber tomb, dolmens , stone alignment, stone circles and anthropomorphic statue figures. These are broadly classified into two (potentially overlapping) classes (after Moorti, 1994, 2008): Sepulchral (containing remains of

2340-497: Is the passage grave . It normally consists of a square, circular, or cruciform chamber with a slabbed or corbelled roof, accessed by a long, straight passageway, with the whole structure covered by a circular mound of earth. Sometimes it is also surrounded by an external stone kerb. Prominent examples include the sites of Brú na Bóinne and Carrowmore in Ireland, Maes Howe in Orkney , and Gavrinis in France. The third tomb type

2430-417: Is the portal tomb —a chamber consisting of upright stones ( orthostats ) with one or more large flat capstones forming a roof. Many portal tombs have been found to contain human remains, but it is debated if their primary function was use as burial sites. The megalithic structures in the northwest of France are believed to be the oldest in Europe based on radiocarbon dating. Though generally known as "dolmens",

2520-453: Is the study of Earth and its components, including the study of rock formations. Petrology is the study of the character and origin of rocks. Mineralogy is the study of the mineral components that create rocks. The study of rocks and their components has contributed to the geological understanding of Earth's history, the archaeological understanding of human history, and the development of engineering and technology in human society. While

2610-579: Is thus assumed that these structures (which have been characterized as the first known ceremonial architecture) were erected by hunter-gatherers . Göbekli Tepe's oldest structures are about 7,000 years older than the Stonehenge megaliths, although it is doubtful that any of the European megalithic traditions ( see below ) are derived from them. Dolmens and standing stones have been found in large areas in other parts of West Asia starting at

2700-508: Is unclear what these giant anthropomorph statues symbolize. They usually occur in association with megalithic monuments and are located in megalithic burial grounds, and may have been connected with ancestor worship. At a number of sites in southeastern Turkey, ceremonial complexes with large T-shaped megalithic orthostats , dating from the Pre-Pottery Neolithic (PPN, c. 9600–7000 cal BC), have been discovered. At

2790-535: The Dorset Cursus ), broad terraces, circular enclosures known as henges , and frequently artificial mounds such as Silbury Hill in England and Monte d'Accoddi in Sardinia (the prehistoric step pyramid). In Europe megaliths are, in general, constructions erected during the Neolithic or late Stone Age and Chalcolithic or Copper Age (4500–1500 BC). The megalithic structures of Malta are believed to be

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2880-542: The Liao River basin in particular in the early phases. The practice of erecting megalithic burials spread quickly from the Liao River Basin and into the Korean Peninsula, where the structure of megaliths is geographically and chronologically distinct. The earliest megalithic burials are called "northern" or "table-style" because they feature an above-ground burial chamber formed by heavy stone slabs that form

2970-590: The Neolithic period (although earlier Mesolithic examples are known) through the Chalcolithic period and into the Bronze Age . While "megalith" is often used to describe a single piece of stone, it also can be used to denote one or more rocks hewn in definite shapes for special purposes. It has been used to describe structures built by people from many parts of the world living in many different periods. The most widely known megaliths are not tombs . The most common type of megalithic construction in Europe

3060-575: The Severn-Cotswold tombs of southwest England and the transepted gallery graves of the Loire region in France share many internal features, although the links between them are not yet fully understood. That they often have antechambers or forecourts is thought to imply a desire on the part of the builders to emphasize a special ritual or physical separation of the dead from the living. Megalithic tombs appear to have been used by communities for

3150-574: The Treaty of the Pyrenees , when Philip IV of Spain ceded a part of the Spanish kingdom to Louis XIV of France , dividing Northern Catalonia from Historical Catalonia . The etymology of the word Albères is problematic due to a lack of ancient documents (the earliest being dated to the 9th century) and because several very common roots seem to correspond with the name. One popular hypothesis

3240-798: The Turkish border in the north of Syria close to Aleppo , southwards down to Yemen . They can be encountered in Lebanon , Syria, Iran , Israel , Jordan , and Saudi Arabia . The largest concentration can be found in southern Syria and along the Jordan Rift Valley ; these are threatened with destruction. They date from the late Chalcolithic or Early Bronze Age. Megaliths have also been found on Kharg Island and Pirazmian in Iran , at Barda Balka in Iraq . A semicircular arrangement of megaliths

3330-417: The asthenosphere . The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy . It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects. Rocks are usually grouped into three main groups: igneous rocks , sedimentary rocks and metamorphic rocks . Igneous rocks are formed when magma cools in

3420-417: The history of geology includes many theories of rocks and their origins that have persisted throughout human history, the study of rocks was developed as a formal science during the 19th century. Plutonism was developed as a theory during this time, and the discovery of radioactive decay in 1896 allowed for the radiocarbon dating of rocks. Understanding of plate tectonics developed in the second half of

3510-399: The 20th century. Rocks are composed primarily of grains of minerals, which are crystalline solids formed from atoms chemically bonded into an orderly structure. Some rocks also contain mineraloids , which are rigid, mineral-like substances, such as volcanic glass , that lack crystalline structure. The types and abundance of minerals in a rock are determined by the manner in which it

3600-754: The Bada, Besoa and Napu valleys. Megaliths in South Asia are dated before 3000 BC, with recent findings dated back to 5000 BC in southern India. Megaliths are found in almost all parts of South Asia. There is also a broad time evolution with the megaliths in central India and the upper Indus valley where the oldest megaliths are found, while those in the east also old shows evidence of continued traditions of living megalithic practices until recently. A large fraction of these are assumed to be associated with burial or post burial rituals, including memorials for those whose remains may or may not be available. The case-example

3690-514: The Early Bronze Age (2200–1800 BC), the prehistoric Sicilian buildings were covered by a circular mound of earth. In the dolmen of Cava dei Servi, archaeologists found numerous human bone fragments and some splinters of Castelluccian ceramics (Early Bronze Age) which confirmed the burial purpose of the artefact. Examples with outer areas, not used for burial, are also known. The Court Cairns of southwest Scotland and northern Ireland,

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3780-442: The Earth's crust, or lava cools on the ground surface or the seabed. Sedimentary rocks are formed by diagenesis and lithification of sediments , which in turn are formed by the weathering , transport, and deposition of existing rocks. Metamorphic rocks are formed when existing rocks are subjected to such high pressures and temperatures that they are transformed without significant melting. Humanity has made use of rocks since

3870-467: The Earth's surface, a process called magma differentiation . This occurs both because minerals low in silica crystallize out of the magma as it begins to cool ( Bowen's reaction series ) and because the magma assimilates some of the crustal rock through which it ascends ( country rock ), and crustal rock tends to be high in silica. Silica content is thus the most important chemical criterion for classifying igneous rock. The content of alkali metal oxides

3960-503: The Earth's surface: temperatures greater than 150 to 200 °C and pressures greater than 1500 bars. This occurs, for example, when continental plates collide. Metamorphic rocks compose 27.4% of the crust by volume. The three major classes of metamorphic rock are based upon the formation mechanism. An intrusion of magma that heats the surrounding rock causes contact metamorphism—a temperature-dominated transformation. Pressure metamorphism occurs when sediments are buried deep under

4050-717: The Malian Lakes Region, there are megaliths of an anthropomorphic nature (e.g., face, navel, scarifications ) that date between 600 CE and 700 CE. Between 1350 BCE and 1500/1600 CE, Senegambian megaliths (e.g., tumuli ) were constructed for the purpose of ancestral reverence . In the northwestern region of the Central African Republic , there are megaliths that were created for various purposes (e.g., burial, ritual performances). Between late 3rd millennium BCE and mid-2nd millennium CE, megaliths (e.g., monuments, cairn burials) were constructed in

4140-594: The Pyrenees, or from the pre-Latin root Alp found in many mountain names in Western Europe. Lluis Basseda favors another hypothesis: the root Alp followed either by the Latin collective suffix -aria or the Iberian-Basque suffix -erri . The term Albera would designate a steep, high mountain but rich in pasture, in contrast to Corbera , used for a rounded, lower relief covered with bushes, as seen in

4230-739: The burials as the graves of chiefs or preeminent individuals. However, whether a result of grave-robbery or intentional mortuary behaviour, most northern megaliths contain no grave goods. Southern-style megalithic burials are distributed in the southern Korean Peninsula . It is thought that most of them date to the latter part of the Early Mumun or to the Middle Mumun Period. Southern-style megaliths are typically smaller in scale than northern megaliths. The interment area of southern megaliths has an underground burial chamber made of earth or lined with thin stone slabs. A massive capstone

4320-523: The constituent particles, and particle size . These physical properties are the result of the processes that formed the rocks. Over the course of time, rocks can be transformed from one type into another, as described by a geological model called the rock cycle . This transformation produces three general classes of rock: igneous , sedimentary and metamorphic . Those three classes are subdivided into many groups. There are, however, no hard-and-fast boundaries between allied rocks. By increase or decrease in

4410-857: The dead) in present-day. Megalithic burials are found in Northeast and Southeast Asia. They are found mainly in the Korean Peninsula . They are also found in the Liaoning , Shandong , and Zhejiang in China, the East Coast of Taiwan , Kyūshū and Shikoku in Japan, Đồng Nai Province in Vietnam and South Asia . Some living megalithic traditions are found on the island of Sumba and Nias in Indonesia . The greatest concentration of megalithic burials

4500-483: The dead), or memorial stones where mortal remains along with funerary objects are placed; and Non-sepulchral including large patterned placement of stones over a wide area. The 'non-sepulchral' type is associated with astronomy and cosmology in South Asia and in other parts of the world (Menon and Vahia, 2010). In the context of prehistoric anthropomorphic figures in India, (Rao 1988/1999, Upinder Singh 2008) note that it

4590-560: The demarcation of the border between France and Spain. Thus, the massif is geographically part of the Pyrenees. Administratively, it is located in the department of Pyrénées-Orientales in France, and in the province of Girona in Catalonia (Spain). The Albères massif is located at the eastern end of the axial zone of the Pyrenees mountain range. This area is mainly made up of Paleozoic and older formations (dating from around 550 millions of years to around 300 millions of years) which outcrop in

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4680-511: The direction of streams. Megalithic cemeteries contain burials that are linked together by low stone platforms made from large river cobbles. Broken red-burnished pottery and charred wood found on these platforms has led archaeologists to hypothesize that these platform were sometimes used for ceremonies and rituals. The capstones of many southern megaliths have 'cup-marks' carvings. A small number of capstones have human and dagger representations. These megaliths are distinguished from other types by

4770-496: The earliest humans. This early period, called the Stone Age , saw the development of many stone tools. Stone was then used as a major component in the construction of buildings and early infrastructure . Mining developed to extract rocks from the Earth and obtain the minerals within them, including metals . Modern technology has allowed the development of new human-made rocks and rock-like substances, such as concrete . Geology

4860-580: The early part of the Late Mumun. An example is found near modern Changwon at Deokcheon-ni, where a small cemetery contained a capstone burial (No. 1) with a massive, rectangularly shaped, stone and earthen platform. Archaeologists were not able to recover the entire feature, but the low platform was at least 56×18 m in size. The Indonesian archipelago is the host of Austronesian and Melanesians megalith cultures both past and present. Living megalith cultures can be found on Nias , an isolated island off

4950-606: The earth's surface by the accumulation and cementation of fragments of earlier rocks, minerals, and organisms or as chemical precipitates and organic growths in water ( sedimentation ). This process causes clastic sediments (pieces of rock) or organic particles ( detritus ) to settle and accumulate or for minerals to chemically precipitate ( evaporite ) from a solution . The particulate matter then undergoes compaction and cementation at moderate temperatures and pressures ( diagenesis ). Before being deposited, sediments are formed by weathering of earlier rocks by erosion in

5040-427: The earth, from an ore body, vein or seam . The term also includes the removal of soil. Materials recovered by mining include base metals , precious metals , iron , uranium , coal , diamonds , limestone , oil shale , rock salt , potash , construction aggregate and dimension stone . Mining is required to obtain any material that cannot be grown through agricultural processes, or created artificially in

5130-402: The ground; pressure is dominant, and temperature plays a smaller role. This is termed burial metamorphism, and it can result in rocks such as jade . Where both heat and pressure play a role, the mechanism is termed regional metamorphism. This is typically found in mountain-building regions. Depending on the structure, metamorphic rocks are divided into two general categories. Those that possess

5220-491: The kind of metals available from the rock of a region. Anthropic rock is synthetic or restructured rock formed by human activity. Concrete is recognized as a human-made rock constituted of natural and processed rock and having been developed since Ancient Rome . Rock can also be modified with other substances to develop new forms, such as epoxy granite . Artificial stone has also been developed, such as Coade stone . Geologist James R. Underwood has proposed anthropic rock as

5310-431: The land to prepare it for other uses once mining ceases. Mining processes may create negative impacts on the environment both during the mining operations and for years after mining has ceased. These potential impacts have led to most of the world's nations adopting regulations to manage negative effects of mining operations. Stone tools have been used for millions of years by humans and earlier hominids . The Stone Age

5400-583: The largest concentration of dolmen in West Asia. In Saudi Arabia, only very few dolmen have been identified so far in the Hejaz . They seem, however, to re-emerge in Yemen in small numbers, and thus could indicate a continuous tradition related to those of Somalia and Ethiopia . The standing stone has a very ancient tradition in West Asia, dating back from Mesopotamian times. Although not always 'megalithic' in

5490-625: The long-term deposition of the remains of their dead, and some seem to have undergone alteration and enlargement. The organization and effort required to erect these large stones suggest that the societies concerned placed great emphasis on the proper treatment of their dead. The ritual significance of the tombs is supported by the presence of pre-historic art carved into the stones at some sites. Hearths and deposits of pottery and animal bone found by archaeologists around some tombs also implies that some form of burial feast or sacrificial rites took place there. Further examples of megalithic tombs include

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5580-519: The lower Tech valley and the plain of Roussillon to the north and the plan of Empordà to the south. The mountains on the right side of the Tech, to the west, the boundary is uncertain and almost impossible to determine. To the south, the Cap de Creus massif is sometimes considered to be part of the Albères. It culminates at 1,256 meters above sea level, at Puig Neulós. The summit ridge of the Albères helps making

5670-624: The most famous of these sites, Göbekli Tepe , parts of the oldest level (III) have been C14-dated as far back as to the mid-10th millennium BC (cal). On this level, 20 great stone circles (up to 20 meters in diameter) with standing stones up to 7 meters high have been identified. At least 5 of these circles have so far (as of 2019) been excavated. Many of the standing stones are richly ornamented with carved reliefs of "[b]ears, boars, snakes, foxes, wildcats, aurochs, gazelle, quadruped reptiles, birds, spiders, insects, quadrupeds, scorpions" and other animals; in addition, some of

5760-547: The most megaliths in Ethiopia. In 2nd millennium BCE, Namoratunga (Monolith Circles) megaliths were constructed as burials the eastern Turkana region of northwestern Kenya . Namoratunga , a group of megaliths dated 300 BC, was used by Cushitic -speaking people as an alignment with star systems tuned to a lunar calendar of 354 days. This site was excavated by B. N. Lynch and L. H. Robins of Michigan State University . Additionally, Tiya in central Ethiopia has

5850-435: The ocean, appear to have been abandoned early. Megalithic building then shifted to constructing networks of artificial islands on the coast that supported a multitude of common, royal and religious structures. Dating of the structures is difficult but the complex at Nan Madol on Pohnpei was probably inhabited as early as c. 800, probably as artificial islands, with the more elaborate buildings and religious structures added to

5940-456: The oldest in Europe. Perhaps the most famous megalithic structure is Stonehenge in England. In Sardinia, in addition to dolmens, menhirs and circular graves there are also more than 8000 megalithic structures made by a Nuragic civilisation, called Nuraghe : buildings similar to towers (sometimes with really complex structures) made using only rocks. They are often near giant's grave or the other megalithic monuments. The French Comte de Caylus

6030-418: The original rock was formed. This process is called metamorphism , meaning to "change in form". The result is a profound change in physical properties and chemistry of the stone. The original rock, known as the protolith , transforms into other mineral types or other forms of the same minerals, by recrystallization . The temperatures and pressures required for this process are always higher than those found at

6120-425: The particles of clastic sedimentary rocks can be further classified by grain size . The smallest sediments are clay , followed by silt , sand , and gravel . Some systems include cobbles and boulders as measurements. Metamorphic rocks are formed by subjecting any rock type—sedimentary rock, igneous rock or another older metamorphic rock—to different temperature and pressure conditions than those in which

6210-626: The predominant formations. On the northern slopes of the massif, the Albères fault (which runs roughly west to east from near Le Boulou to near Argelès ) marks a clear geological and topographical boundary between the Palaeozoic and older formations of the Albera massif and the Neogene deposits of the Roussillon basin. The Albera Range became the border between France and Spain following

6300-516: The presence of a burial shaft, sometimes up to 4 m in depth, which is lined with large cobbles. A large capstone is placed over the burial shaft without propping stones. Capstone-style megaliths are the most monumental type in the Korean Peninsula , and they are primarily distributed near or on the south coast of Korea. It seems that most of these burials date to the latter part of the Middle Mumun (c. 700–550 BC), and they may have been built into

6390-466: The proportions of their minerals, they pass through gradations from one to the other; the distinctive structures of one kind of rock may thus be traced, gradually merging into those of another. Hence the definitions adopted in rock names simply correspond to selected points in a continuously graduated series. Igneous rock (derived from the Latin word igneus, meaning of fire, from ignis meaning fire)

6480-515: The region in names such as the commune Corbère-les-Cabanes or the Corbières massif. This hypothesis aligns with the layout of the places in question. The name first appeared in Latin in 844 in a text by the future Emperor Charles the Bald, which mentions a place located in monte Albario . The term is found interchangeably in the singular or plural during the Middle Ages. It eventually became fixed in

6570-716: The regions (e.g., Eastern Adamawa , Oubanguian Ridge, Chad/Congo watershed ) in Central African Republic and Cameroon, throughout various periods (e.g., Balimbé: 2000 BCE – 1000 BCE; Early Gbabiri: 950 BCE – 200 BCE; Late Gbabiri: 200 BCE – 500 CE; Bouboun: 500 CE – 1600 CE), for various purposes (e.g., ritual practices, territorial marking). In the Ethiopian Highlands of Harar , the earliest construction of megaliths occurred. From this region and its megalith-building tradition (e.g., dolmens, tumuli with burial chambers organized in cemeteries),

6660-609: The sacred megalith sites. The fact that the beliefs are alive is a reason that most excavations have been stopped at the sites. Megalithic structures in Micronesia reach their most developed form on the islands of Pohnpei and Kosrae in the Eastern Caroline Islands. On these two islands there was extensive use of prismatic basalt columns to build upland building complexes such as those at Salapwuk on Pohnpei and Menka on Kosrae. These building sites, remote from

6750-845: The singular in Catalan as Albera and in the plural in French. Thus, in French, the expression "les Albères" refers to the massif, while L'Albère is the name of a French commune located within this massif. The Albères massif is bounded to the west by the Col du Perthus and the Rome river, which separate it from the Salines massif, to the east by the Mediterranean Sea between Argelès-sur-Mer in France and Port-Bou and Llançà in Spain. The Albères dominate

6840-431: The site from 1000 to 1400 AD. Rock (geology) In geology , rock (or stone ) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition , and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust , and most of its interior, except for the liquid outer core and pockets of magma in

6930-675: The stalled cairn at Midhowe in Orkney and the passage grave at Bryn Celli Ddu on Anglesey . There are also extensive grave sites with up to 60 megaliths at Louisenlund and Gryet on the Danish island of Bornholm . Despite its name, the Stone Tomb in Ukraine was not a tomb but rather a sanctuary. In association with the megalithic constructions across Europe, there are often large earthworks of various designs—ditches and banks (like

7020-718: The stones are carved in low profile with stylized human features (arms, hands, loincloths, but no heads ). On the younger level (II) rectangular structures with smaller megaliths have been excavated. In the surrounding area, several village sites incorporating elements similar to those of Göbekli Tepe have been identified. Four of these have Göbekli Tepe's characteristic T-shaped standing stones, though only one of them, Nevalı Çori , has so far been excavated. At Göbekli Tepe itself, no traces of habitation have so far been found, nor any trace of agriculture or cultivated plants, though bones of wild animals and traces of wild edible plants, along with many grinding stones, have been unearthed. It

7110-747: The subsequent traditions in other areas of Ethiopia likely developed. In the late 1st millennium BCE, the urban civilization of Axum developed a megalithic stelae -building tradition, which commemorated Axumite royalty and elites, that persisted until the Christian period of Axum . In the Sidamo Province, the megalithic monoliths of the stelae-building cultural tradition were utilized as tombstones in cemeteries (e.g., Arussi, Konso, Sedene, Tiya, Tuto Felo), and have engraved anthropomorphic features (e.g., swords, masks), phallic form, and some of that served as markers of territory. Sidamo Province has

7200-948: The summer solstice . Findings indicate that the region was occupied only seasonally, likely only in the summer when the local lake filled with water for grazing cattle . There are other megalithic stone circles in the southwestern desert. At Nabta Playa , located in Egypt and broader region of the Eastern Sahara , there is a megalithic cultural complex (e.g., sacrificed cow burial site, solar calendar , altar ) that dates between 4000 BCE and 2000 BCE. Likely part of Copper Age and Bronze Age cultural traditions of megalith-building , megaliths (e.g., dolmens ) were constructed in Mediterranean North Africa. In Cross-River State , Nigeria, there are megalithic monoliths of an anthropomorphic nature. At Tondidarou , in

7290-615: The term most accepted by archaeologists is "portal tomb". Local names for portal tombs exist in multiple locations, such as anta in Galicia and Portugal, stazzone in Sardinia , hunebed in the Netherlands, Hünengrab in Germany, dysse in Denmark, and cromlech in Wales . It is assumed that most portal tombs were originally covered by earthen mounds. The second-most-common tomb type

7380-957: The tribes of Israel. The tradition of venerating standing stones continued in Nabatean times. Related phenomena, such as cupholes, rock-cut tombs and circles, also occur in West Asia. Megaliths occur in many parts of Melanesia , mainly in Milne Bay Province , Fiji and Vanuatu . Few excavations have been made and little is known about the structures. The megalith tomb Otuyam at Kiriwina has been dated to be approximately 2,000 years old which indicates that megaliths are an old custom in Melanesia. However very few megaliths have been dated. The constructions have been used for different rituals. For example, tombs, sacrifices and rituals of fecundity. Dance sites exist next to some megaliths. In some places in Melanesia rituals are continued to be held at

7470-618: The true sense, they occur throughout the area and can reach 5 metres or more in some cases (such as at Ader in Jordan). This phenomenon can also be traced through many passages from the Old Testament , such as those related to Jacob , the grandson of Abraham , who poured oil over a stone that he erected after his famous dream in which angels climbed to heaven (Genesis 28:10–22). Jacob is also described as putting up stones at other occasions, whereas Moses erected twelve pillars symbolizing

7560-621: The universe's celestial bodies. In the Solar System , Mars , Venus , and Mercury are composed of rock, as are many natural satellites , asteroids , and meteoroids . Meteorites that fall to Earth provide evidence of extraterrestrial rocks and their composition. They are typically heavier than rocks on Earth. Asteroid rocks can also be brought to Earth through space missions, such as the Hayabusa mission. Lunar rocks and Martian rocks have also been studied. The use of rock has had

7650-1081: The western coast of North Sumatra , the Batak people in the interior of North Sumatra, on Flores and Sumba island in East Nusa Tenggara and also Toraja people from the interior of South Sulawesi . These megalith cultures remained preserved, isolated and undisturbed well into the late 19th century. Several megalith sites and structures are also found across Indonesia. Menhirs, dolmens, stone tables, and ancestral stone statues were discovered in various sites in Java , Sumatra , Sulawesi , Lesser Sunda Islands , and New Guinea . The Cipari megalith site also in West Java displays monoliths, stone terraces, and sarcophagi. Lore Lindu National Park in Central Sulawesi houses ancient megalith relics such as ancestral stone statues, mostly located in

7740-408: Was a period of widespread stone tool usage. Early Stone Age tools were simple implements, such as hammerstones and sharp flakes. Middle Stone Age tools featured sharpened points to be used as projectile points , awls, or scrapers . Late Stone Age tools were developed with craftsmanship and distinct cultural identities. Stone tools were largely superseded by copper and bronze tools following

7830-456: Was formed. Most rocks contain silicate minerals , compounds that include silica tetrahedra in their crystal lattice , and account for about one-third of all known mineral species and about 95% of the earth's crust . The proportion of silica in rocks and minerals is a major factor in determining their names and properties. Rocks are classified according to characteristics such as mineral and chemical composition, permeability , texture of

7920-626: Was found in Israel at Atlit Yam , a site that is now under the sea. It is a very early example, dating from the 7th millennium BC . The most concentrated occurrence of dolmens in particular is in a large area on both sides of the Jordan Rift Valley , with greater predominance on the eastern side. They occur first and foremost on the Golan Heights , the Hauran , and in Jordan, which probably has

8010-624: Was quarried for construction as early as 4000 BCE in Egypt, and stone was used to build fortifications in Inner Mongolia as early as 2800 BCE. The soft rock, tuff , is common in Italy, and the Romans used it for many buildings and bridges. Limestone was widely used in construction in the Middle Ages in Europe and remained popular into the 20th century. Mining is the extraction of valuable minerals or other geological materials from

8100-679: Was the first to describe the Carnac stones . Pierre Jean-Baptiste Legrand d'Aussy introduced the terms menhir and dolmen , both taken from the Breton language , into antiquarian terminology. He mistakenly interpreted megaliths as Gallic tombs. In Britain, the antiquarians Aubrey and Stukeley conducted early research into megaliths. In 1805, Jacques Cambry published a book called Monuments celtiques, ou recherches sur le culte des Pierres, précédées d'une notice sur les Celtes et sur les Druides, et suivies d'Etymologie celtiques , where he proposed

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