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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 Stone tool, lithic debitage from the industry such as blades and Lithic flake, flakes. The area has outcrops of fine-grained greenstone (archaeology), greenstone or hornstone suitable for making polished stone axes. Such ... [...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 development 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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scafell Pike
Scafell Pike () is a mountain in the Lake District region of Cumbria, England. It has an elevation of above sea level, making it the highest and the most prominent mountain in England. The mountain is part of the Scafell massif, an extinct volcano, and is one of the Southern Fells. 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''. Alternatively, ''Scafell'' means "the mountain of the ''scaw'' (or promontory)". This usage can be compared etymologically with, for example, Skaw, Unst. The name 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 ''the Pik ... [...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''). A pyroclastic rock containing 25–75% volcanic bombs or volcanic blocks is called tuff breccia. 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 t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic
A volcano is commonly defined as a vent or fissure 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 because most of Earth's plate boundaries are underwater, most volcanoes 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 resulting from divergent tectonic activity are usually non-explosive whereas those resulting from convergent tectonic activity cause violent eruptions."Mid-ocean ridge tectonics, volcanism and geomorphology." Geology 26, no. 455 (2001): 458. https://macdonald.faculty.geol.ucsb.edu/papers/Macdonald%20Mid-Ocean%20Ridge%20Tectonics.pdf Volcanoes can also form where there is stretching a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Mapping
A geological map or geologic 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 geological mapping agencies and authorities have different standards for the colors and symbols to be used for rocks of d ... [...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 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 below, or from further afield. Loft Crag stands next along the rampart, with Thorn Crag and Harrison Stickle further to the east. 'Behind' Pike of Stickle to the north i ... [...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 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, visually the mos ... [...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 name Epidote is derived from the Greek word 'epidosis', meaning "increase", in allusion to the crystal characteristic of one longer side at the base of the prism. 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 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet Archive
The Internet Archive is an American 501(c)(3) organization, non-profit organization founded in 1996 by Brewster Kahle that runs a digital library website, archive.org. It provides free access to collections of digitized media including websites, Application software, software applications, music, audiovisual, and print materials. The Archive also advocates a Information wants to be free, free and open Internet. Its mission is committing to provide "universal access to all knowledge". 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 hundreds of billions of web captures. The Archive also oversees numerous Internet Archive#Book collections, book digitization projects, collectively one of the world's largest book digitization efforts. ... [...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 Intrusive rock, intrusive igneous masses and have been rendered massive, hard, splintery, and in some cases exceedingly tough and durable. These properties are caused by 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 ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
