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PREFERRED TERM
chalk  
TYPE
  • http://purl.org/net/provenance/ns#DataItem

DEFINITION
  • A generally soft, white, very fine-grained, extremely pure, porous limestone. It forms under marine conditions from the gradual accumulation of skeletal elements from minute planktonic green algae (cocoliths), associated with varying proportions of larger microscopic fragments of bivalves, foraminifera and ostracods. It is common to find flint and chert nodules embedded in chalk.
DESCRIPTION
  • A generally soft, white, very fine-grained, extremely pure, porous limestone. It forms under marine conditions from the gradual accumulation of skeletal elements from minute planktonic green algae (cocoliths), associated with varying proportions of larger microscopic fragments of bivalves, foraminifera and ostracods. It is common to find flint and chert nodules embedded in chalk.
IDENTIFIER
  • chalk
TITLE
  • chalk
URI
http://inspire.ec.europa.eu/codelist/LithologyValue/chalk
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EQUIVALENT CONCEPTS
Lithology