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Langdale Axe Industry
The Langdale axe industry (or factory) is the name given by archaeologists to a Neolithic centre of specialised stone tool production in the Great Langdale area of the English Lake District. (For accompanying material seSupplement 1of same volume). The existence of the site, which dates from around 4,000–3,500 BC, was suggested by chance discoveries in the 1930s. More systematic investigations were undertaken by Clare Fell and others in the 1940s and 1950s, since when several field surveys of varying scope have been carried out. Typical finds include reject axes, rough-outs and blades created by knapping large lumps of the rock found in the scree or perhaps by simple quarrying or opencast mining. Hammerstones have also been found in the scree and other lithic debitage from the industry such as blades and flakes. The area has outcrops of fine-grained greenstone or hornstone suitable for making polished stone axes. Such axes have been found distributed across Great ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hammerstone
In archaeology, a hammerstone is a hard cobble used to strike off lithic flakes from a lump of tool stone during the process of lithic reduction. The hammerstone is a rather universal stone tool which appeared early in most regions of the world including Europe, India and North America. This technology was of major importance to prehistoric cultures before the age of metalworking. Materials A hammerstone is made of a material such as sandstone, limestone or quartzite, is often ovoid in shape (to fit the human hand better), and develops telltale battering marks on one or both ends. In archaeological recovery, hammerstones are often found in association with other stone tool artifacts, debitage and/or objects of the hammer such as ore. The modern use of hammerstones is now mostly limited to flintknappers and others who wish to develop a better understanding of how stone tools were made. Usage Hammerstones are or were used to produce flakes and hand axes as well as mor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scafell Pike
Scafell Pike () is the highest and the most prominent mountain in England, at an elevation of above sea level. It is located in the Lake District National Park, in Cumbria, and is part of the Southern Fells and the Scafell massif. Scafell Pike forms part of the inactive Scafells volcano. Etymology and name history The name ''Scafell'' is believed by some to derive from the Old Norse ''skalli fjall'', meaning either the fell with the shieling or the fell with the bald summit, and is first recorded in 1578 in the corrupted form ''Skallfield''. An alternative derivation is from the Old Norse "skagi", meaning a cape, headland, promontory or peninsula – so giving an etymology that aligns with Skaw in Shetland. It originally referred to Scafell, which neighbours Scafell Pike.Dorothy Wordsworth's ascent of Scafell Pike, 1818, http://www.pastpresented.ukart.com/eskdale/wordsworth1.htm What are now known as Scafell Pike, Ill Crag, and Broad Crag were collectively called either ''t ... [...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] |
Volcanic
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Mapping
A geologic map or geological map is a special-purpose map made to show various geological features. Rock units or geologic strata are shown by color or symbols. Bedding planes and structural features such as faults, folds, are shown with strike and dip or trend and plunge symbols which give three-dimensional orientations features. Stratigraphic contour lines may be used to illustrate the surface of a selected stratum illustrating the subsurface topographic trends of the strata. Isopach maps detail the variations in thickness of stratigraphic units. It is not always possible to properly show this when the strata are extremely fractured, mixed, in some discontinuities, or where they are otherwise disturbed. Symbols Lithologies Rock units are typically represented by colors. Instead of (or in addition to) colors, certain symbols can be used. Different geologic mapping agencies and authorities have different standards for the colors and symbols to be used for rocks of differin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pike Of Stickle
Pike of Stickle, also known as Pike o’ Stickle, is a fell in the English Lake District. It reaches a height of 709 metres (2,326 feet) and is situated in the central part of the national park in the valley of Great Langdale. The fell is one of three fells which make up the picturesque Langdale Pikes (the others being Harrison Stickle and Loft Crag), one of the best-known areas in Lakeland. A "stickle" is a hill with a steep prominent rocky top, while a "pike" is a hill with a peaked summit, the name being therefore partly tautological. Topography The Langdale Pikes form a raised rocky parapet around the southern and eastern edges of a high tableland centred upon Thunacar Knott. Pike of Stickle stands at the western end of this system and its crags fall south from the summit, presenting an arresting view from the valley floor 2,000 ft below, or from further afield. Loft Crag stands next along the rampart, with Thorn Crag and Harrison Stickle further to the eas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harrison Stickle
Harrison Stickle is a fell in the central part of the English Lake District, situated above Great Langdale. The fell is one of the three (although the number is debated) fells which make up the picturesque Langdale Pikes, the others being Pike of Stickle and Loft Crag. Together they make up one of the most picturesque, and probably the best-known, mountain groups in the District. A "stickle" is a hill with a prominent rocky top. Topography The Langdale Pikes form a raised rocky parapet around the southern and eastern edges of a high tableland centred upon Thunacar Knott. Harrison Stickle is the high point of this system and its crags fall south and east from the summit, presenting an arresting view from the valley floor 2,000 ft below, or from further afield. To the north, the main ridge of the central fells passes over Thunacar Knott before climbing to High Raise. The craggy eastern face of this ridge continues north as far as Harrison's near neighbour, Pavey Ark, visua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epidote
Epidote is a calcium aluminium iron sorosilicate mineral. Description Well developed crystals of epidote, Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH), crystallizing in the monoclinic system, are of frequent occurrence: they are commonly prismatic in habit, the direction of elongation being perpendicular to the single plane of symmetry. The faces are often deeply striated and crystals are often twinned. Many of the characters of the mineral vary with the amount of iron present for instance, the color, the optical constants, and the specific gravity. The color is green, grey, brown or nearly black, but usually a characteristic shade of yellowish-green or pistachio-green. It displays strong pleochroism, the pleochroic colors being usually green, yellow and brown. Clinozoisite is green, white or pale rose-red group species containing very little iron, thus having the same chemical composition as the orthorhombic mineral zoisite. The name, due to Haüy, is derived from the Greek word "epidos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet Archive
The Internet Archive is an American digital library with the stated mission of "universal access to all knowledge". It provides free public access to collections of digitized materials, including websites, software applications/games, music, movies/videos, moving images, and millions of books. In addition to its archiving function, the Archive is an activist organization, advocating a free and open Internet. , the Internet Archive holds over 35 million books and texts, 8.5 million movies, videos and TV shows, 894 thousand software programs, 14 million audio files, 4.4 million images, 2.4 million TV clips, 241 thousand concerts, and over 734 billion web pages in the Wayback Machine. The Internet Archive allows the public to upload and download digital material to its data cluster, but the bulk of its data is collected automatically by its web crawlers, which work to preserve as much of the public web as possible. Its web archiving, web archive, the Wayback Machine, contains hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hornstone
Hornfels is the group name for a set of Metamorphism#Contact .28thermal.29, contact metamorphic rocks that have been baked and hardened by the heat of Intrusion, 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 Crystal habit, 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 Sharpening stone, 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 (geology), cleavage planes, this structure is effaced or rendered inopera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greenstone (archaeology)
Greenstone is a common generic term for valuable, green-hued minerals and metamorphosed igneous rocks and stones which early cultures used in the fashioning of hardstone carvings such as jewelry, statuettes, ritual tools, and various other artifacts. Greenstone artifacts may be made of greenschist, chlorastrolite, serpentine, omphacite, chrysoprase, olivine, nephrite, chloromelanite among other green-hued minerals. The term also includes jade and jadeite, although these are perhaps more frequently identified by these latter terms. The greenish hue of these rocks generally derives from the presence of minerals such as chlorite, hornblende, or epidote.Kipfer (2000, p.218) Greenstone minerals were presumably selected for their color rather than their chemical composition. In archaeology therefore, having a loosely applied general term is at least partially influenced by the observation that ancient cultures often used and considered these various green-hued materials as interchan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
