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Golondrina Point
Golondrina points (formerly Plainview Golondrina) are lanceolate spear or dart projectile points, of medium size, dated to the transitional Paleo-Indian Period, between 9000–7000 BP. Golondrina points were attached on split-stem hafts and may have served to bring down medium-sized animals such as deer, as well as functioning as butchering knives. Distribution is widespread throughout most of Texas, and points have also been discovered in Arkansas and Mexico. The concentration of Golondrina specimens is highest across the South Texas Plains, where the point is the most prevalent of Paleo-Indian types and defines a distinctive cultural pattern for the region. The Golondrina point is so named for its flared basal corners ("ears"), which resemble a swallow's (''golondrina'' in Spanish) split tail. Classification of Golondrina can be difficult because of its similarity to other types, particularly the Plainview point, to which it was originally thought to be related. Classificati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amistad Reservoir
Amistad Reservoir ( es, Presa Amistad) is a reservoir on the Rio Grande at its confluence with the Devils River northwest of Del Rio, Texas. The lake is bounded by Val Verde County on the United States side of the international border and by the state of Coahuila on the Mexican side of the border; the American shoreline forms the Amistad National Recreation Area. The reservoir was formed in 1969 by the construction of Amistad Dam. The dam and lake are managed jointly by the governments of the United States and Mexico through the International Boundary and Water Commission. The name of the dam and lake is the Spanish word for "friendship". The reservoir is also known as Lake Amistad. Hydrology Amistad Reservoir is part of the Rio Grande, which forms its principal inflow at its northwestern end. The other major inflow is the Devils River, which enters from the north. The reservoir occupies a series of meanders between the two rivers; its outflow passes through Amistad Dam on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hearth
A hearth () is the place in a home where a fire is or was traditionally kept for home heating and for cooking, usually constituted by at least a horizontal hearthstone and often enclosed to varying degrees by any combination of reredos (a low, partial wall behind a hearth), fireplace, oven, smoke hood, or chimney. Hearths are usually composed of masonry such as brick or stone. For centuries, the hearth was such an integral part of a home, usually its central and most important feature, that the concept has been generalized to refer to a homeplace or household, as in the terms "hearth and home" and "keep the home fires burning". In the modern era, since the advent of central heating, hearths are usually less central to most people's daily life because the heating of the home is instead done by a furnace or a heating stove, and cooking is instead done with a kitchen stove/range (combination cooktop and oven) alongside other home appliances; thus many homes built in the 20t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baker Cave
Baker Cave is a prehistoric archaeological site, located on a small canyon near Devils River (Texas), Devils River in Southwest Texas. Dating from ''circa'' 7,000–7,800 BCE, Baker Cave is a part of a system of rock shelters in the Lower Pecos Canyons region and was 120 feet long by 56 feet deep (37 m × 17 m). The ceiling varied from at the mouth to just a few inches in the back. These sites are common in the limestone formations in the Lower Pecos region. The site was perched well above the flood, preserving the materials that ancient peoples had left behind. A large cooking hearth was found inside it, dating to around 9,000 years ago, and containing small creatures such as snakes, rats, fish, and rabbits, and a wide variety of seeds and nuts, indicating a diversified diet."Lower Pecos Canyonland." ''Texa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiocarbon Dating
Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby. It is based on the fact that radiocarbon () is constantly being created in the Earth's atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of it contains begins to decrease as the undergoes radioactive decay. Measuring the amount of in a sample from a dead plant or animal, such as a piece of wood or a fragment of bone, provides information that can be used to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratification (archeology)
Stratigraphy is a key concept to modern archaeological theory and practice. Modern excavation techniques are based on stratigraphic principles. The concept derives from the geological use of the idea that sedimentation takes place according to uniform principles. When archaeological finds are below the surface of the ground (as is most commonly the case), the identification of the context of each find is vital in enabling the archaeologist to draw conclusions about the site and about the nature and date of its occupation. It is the archaeologist's role to attempt to discover what contexts exist and how they came to be created. Archaeological stratification or sequence is the dynamic superimposition of single units of stratigraphy, or contexts. Contexts are single events or actions that leave discrete, detectable traces in the archaeological sequence or stratigraphy. They can be deposits (such as the back-fill of a ditch), structures (such as walls), or "zero thickness surfaci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knapping
Knapping is the shaping of flint, chert, obsidian, or other conchoidal fracturing stone through the process of lithic reduction to manufacture stone tools, strikers for flintlock firearms, or to produce flat-faced stones for building or facing walls, and flushwork decoration. The original Germanic term ''knopp'' meant to strike, shape, or work, so it could theoretically have referred equally well to making statues or dice. Modern usage is more specific, referring almost exclusively to the hand-tool pressure-flaking process pictured. It is distinguished from the more general verb "chip" (to break up into small pieces, or unintentionally break off a piece of something) and is different from "carve" (removing only part of a face), and "cleave" (breaking along a natural plane). Method Flintknapping or knapping is done in a variety of ways depending on the purpose of the final product. For stone tools and flintlock strikers, chert is worked using a fabricator such as a hammer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jasper
Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases,Kostov, R. I. 2010. Review on the mineralogical systematics of jasper and related rocks. – Archaeometry Workshop, 7, 3, 209-213PDF/ref> is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron(III) inclusions. Jasper breaks with a smooth surface and is used for ornamentation or as a gemstone. It can be highly polished and is used for items such as vases, seals, and snuff boxes. The specific gravity of jasper is typically 2.5 to 2.9. Jaspillite is a banded-iron-formation rock that often has distinctive bands of jasper. Etymology and history The name means "spotted or speckled stone," and is derived via Old French ''jaspre'' (variant of Anglo-Norman ''jaspe'') and Latin ''iaspidem'' (nom. ''iaspis'') from Greek ἴασπις ''iaspis'' (feminine noun), from an Afroasiatic languag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agate
Agate () is a common rock formation, consisting of chalcedony and quartz as its primary components, with a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks. The ornamental use of agate was common in Ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus Valley civilisation. Etymology The stone was given its name by Theophrastus, a Greek philosopher and naturalist, who discovered the stone along the shore line of the Dirillo River or Achates ( grc, Ἀχάτης) in Sicily, sometime between the 4th and 3rd centuries BCE. Formation and properties Agate minerals have the tendency to form on or within pre-existing rocks, creating difficulties in accurately determining their time of formation. Their host rocks have been dated to have formed as early as the Archean Eon. Agates are most commonly found as n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chert
Chert () is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood. Chert is typically composed of the petrified remains of siliceous ooze, the biogenic sediment that covers large areas of the deep ocean floor, and which contains the silicon skeletal remains of diatoms, silicoflagellates, and radiolarians. Precambrian cherts are notable for the presence of fossil cyanobacteria. In addition to microfossils, chert occasionally contains macrofossils. However, some chert is devoid of any fossils. Chert varies greatly in color (from white to black), but most often manifests as gray, brown, grayish brown and light green to rusty redW.L. Roberts, T.J. Campbell, G.R. Rapp Jr., "Encyclopedia of Mineralogy, Second Edition", 1990. R.S. M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flake Scars
Flake or Flakes may refer to: People * Floyd H. Flake (born 1945), A.M.E. minister, university administrator, former U.S. representative * Jeff Flake (born 1962), American politician * Christian "Flake" Lorenz, German musician and member of the band Rammstein * Jake Flake, American politician Arts, entertainment, and media Music Groups * Flake (band), an Australian psyche/prog rock band from Sydney, active in the late 1960s and early 1970s * Flake, the original name of the band Flake Music, the predecessor of The Shins Songs * "Flake" (song), a song from the 2001 album ''Brushfire Fairytales'' by Jack Johnson * "Flake", an early song by System of a Down, see System of a Down discography * "Flakes", a song from the 1979 album ''Sheik Yerbouti'' by Frank Zappa * "Flakes", a song from the 2008 album '' Twenty One'' by the Mystery Jets Other arts, entertainment, and media * ''Flakes'' (film), a 2007 film with Aaron Stanford and Zooey Deschanel * ''Flakes'' (manga), a mang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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