Materials
Chalk
Sedimentary Rocks
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Chalk is a soft, white, porous sedimentary carbonate rock, a form of limestone composed of the mineral calcite. It formed under the sea by the accumulation and lithification of the hard parts of organisms, mostly microscopic plankton such as foraminifera and coccolithophores, that had settled to the sea floor.
Facts
Formation ClassSedimentary, biochemical (a form of limestone built from the calcite remains of marine plankton such as foraminifera and coccolithophores) 1 Cross-Tradition Connections
Associated With
Host rock: chert occurring within chalk is conventionally distinguished by the name flint.
Host rock: flint occurs as nodules within chalk.
In Discipline
Sources
1. Chalk (Wikipedia)
Wikimedia FoundationLead sectionQuote, Lead section
tiny fragments of the calcite shells or skeletons of plankton, such as foraminifera or coccolithophores.
Flint (Wikipedia)
Wikimedia FoundationAssociated With: Flint, Lead sectionQuote, Associated With: Flint, Lead section
categorized as the variety of chert that occurs in chalk or marly limestone.
Chert (Wikipedia)
Wikimedia FoundationAssociated With: Chert, Lead section, occurrence sentenceQuote, Associated With: Chert, Lead section, occurrence sentence
Where chert occurs in chalk or marl, it is usually called flint.
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