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Chert - Wikipedia
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 … 展开
In petrology, the term "chert" refers generally to all chemically precipitated sedimentary rocks composed primarily of microcrystalline, cryptocrystalline and microfibrous silica. Most cherts are nearly pure silica, with less than … 展开
The cryptocrystalline nature of chert, combined with its above average ability to resist weathering, recrystallization and metamorphism has made it an ideal rock for preservation of early … 展开
There are numerous varieties of chert, classified based on their visible, microscopic and physical characteristics. Examples are: 展开
• Photo & note re: Fig Tree Formation
• Microphotographs of Fig Tree fossils
• Schopf, J.W. (1999) Cradle of Life: The Discovery of Earth's Earliest Fossils, Princeton University Press, 336 p. ISBN 0-691-00230-4 展开• Petrology – Branch of geology that studies the formation, composition, distribution and structure of rocks
• Archaeology – Study of human activity based on materials that people have left behind. 展开CC-BY-SA 许可证中的维基百科文本 Mill Creek chert - Wikipedia
Gunflint chert - Wikipedia
Chert - Simple English Wikipedia, the free encyclopedia
Chert and flint | Mineral, Sedimentary Rock | Britannica
网页1998年7月20日 · chert and flint, very fine-grained quartz (q.v.), a silica mineral with minor impurities. Several varieties are included under the general term chert: jasper, chalcedony, agate (qq.v.), flint, porcelanite, …
Chert Rock | Types, Properties, Composition, …
网页2023年4月23日 · Chert is a fine-grained sedimentary rock composed of quartz (SiO2) that is microcrystalline or cryptocrystalline quartz. It is usually organic rock but also occur inorganically as a chemical …
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Chert: Sedimentary Rock - Pictures, Definition, Formation
网页Chert is a rock composed of microcrystalline quartz, often with colorful inclusions. It was used for tools and weapons by early people and has various applications today.
Chert - Presidio of San Francisco (U.S. National Park …
网页2015年2月28日 · In the Franciscan Complex, chert is a silica-rich rock formed from the altered shells of microscopic radiolaria, which slowly rained down onto the ocean bottom. Bedded chert is only developed in deep …
Chert - New World Encyclopedia
网页Chert occurs as oval to irregular nodules in greensand, limestone, chalk, and dolostone formations as a replacement mineral, where it is formed as a result of some type of diagenesis. Where it occurs in chalk, it is usually …
What is the Rhynie Chert? | School of Geosciences
网页The Rhynie cherts are part of the surface expression of an Early Devonian precious metal-bearing (contains minor gold) hot-spring system. This is the oldest hot spring system known where surface features such as geyser …