Stone tool

A stone tool is, in the most general sense, any tool made either partially or entirely out of stone. Although stone tool-dependent societies and cultures still exist today, most stone tools are associated with prehistoric, particularly Stone Age cultures that have become extinct. Archaeologists often study such prehistoric societies, and refer to the study of stone tools as lithic analysis. Ethnoarchaeology has been a valuable research field in order to further the understanding and cultural implications of stone tool use and manufacture.

Stone has been used to make a wide variety of different tools throughout history, including arrow heads, spearpoints and querns. Stone tools may be made of either ground stone or chipped stone, and a person who creates tools out of the latter is known as a flintknapper.

Chipped stone tools are made from cryptocrystalline materials such as chert or flint, radiolarite, chalcedony, obsidian, basalt, and quartzite via a process known as lithic reduction. One simple form of reduction is to strike stone flakes from a nucleus (core) of material using a hammerstone or similar hard hammer fabricator. If the goal of the reduction strategy is to produce flakes, the remnant lithic core may be discarded once it has become too small to use. In some strategies, however, a flintknapper reduces the core to a rough unifacial or bifacial preform, which is further reduced using soft hammer flaking techniques or by pressure flaking the edges.

Rock (geology)

In geology, rock or stone is a naturally occurring solid aggregate of one or more minerals or mineraloids. For example, the common rock granite is a combination of the quartz, feldspar and biotite minerals. The Earth's outer solid layer, the lithosphere, is made of rock.

Rocks have been used by mankind throughout history. From the Stone Age, rocks have been used for tools. The minerals and metals found in rocks have been essential to human civilization.

Three major groups of rocks are defined: igneous, sedimentary, and metamorphic. The scientific study of rocks is called petrology, which is an essential component of geology.

Classification

At a granular level, rocks are composed of grains of minerals, which, in turn, are homogeneous solids formed from a chemical compound that is arranged in an orderly manner. The aggregate minerals forming the rock are held together by chemical bonds. The types and abundance of minerals in a rock are determined by the manner in which the rock was formed. Many rocks contain silica (SiO₂); a compound of silicon and oxygen that forms 74.3% of the Earth's crust. This material forms crystals with other compounds in the rock. The proportion of silica in rocks and minerals is a major factor in determining their name and properties.

Stone (1751 Kent cricketer)

Stone (first name and dates unknown) was an English cricketer who played in major cricket matches for Kent in 1751.

Career

Stone played in two major matches in 1751 for Kent against the All-England Eleven. On 20 and 21 May, he was a member of the Kent team that lost by 9 runs at the Artillery Ground. A return match was arranged at the same venue on 22 May and All-England won by an innings and 9 runs, with Stone again a member of the Kent team.

Stone was also named in two single wicket "fives" matches that were held on 3 and 5 June at the Artillery Ground. In both games, he played for Kent against Surrey, Kent winning each time.

Stone is only recorded on those four occasions and it is not known if he played regularly in earlier and later seasons. Players were rarely mentioned by name in contemporary reports and there are no other known references to Stone.

References

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Bibliography

Stone (TV series)

Stone is an American police drama that aired on ABC on Monday nights between January 14 and March 17, 1980. The series was a Stephen J. Cannell Productions in association with Gerry Productions, Inc. and Universal Television (it was Cannell's last series before he went independent) and was created by Cannell, Richard Levinson and William Link.

Premise

The series focused on Det Sgt. Daniel Stone, a police officer who wrote best selling novels on police work based on his own experiences. His superior Chief Paulton, his one time mentor, was unhappy with Stone's writing but was unable to stop him. The role of Det. Buck Rogers was played by series star Dennis Weaver's son Robby Weaver.

Cast

References

Technology (disambiguation)

Technology is the collection of tools, including machinery, modifications, arrangements and procedures used by humans.

Technology may also refer to:

See also