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- Chalk_Group abstract "The Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the late Cretaceous limestone succession in southern and eastern England. The same or similar rock sequences occur across the wider northwest European chalk 'province'. It is characterised by thick deposits of chalk, a soft porous white limestone, deposited in a marine environment.Chalk is a limestone that consists of coccolith biomicrite. A biomicrite is a limestone composed of fossil debris ("bio") and calcium carbonate mud ("micrite"). The majority of the fossil debris comprising chalk consists of the microscopic plates, which are called coccoliths, of microscopic green algae known as coccolithophores. In addition to the coccoliths, the fossil debris includes a variable, but minor, percentage of the fragments of foraminifera, ostracods and mollusks. The coccolithophores lived in the upper part of the water column. When they died, the microscopic calcium carbonate plates, which formed their shells settled downward through the ocean water and accumulated on the ocean bottom to form a thick layer of calcareous ooze, which eventually became the Chalk Group.The Chalk Group usually shows few signs of bedding, other than lines of flint nodules which become common in the upper part. Nodules of the mineral pyrite also occur and are usually oxidized to brown iron oxide on exposed surfaces.Well-known outcrops include the White Cliffs of Dover, the southern coastal cliffs of the Isle of Wight and the quarries and motorway cuttings at Blue Bell Hill, Kent, (which has been classified as a Site of Special Scientific Interest) and at the Stokenchurch Gap on the Oxfordshire/Buckinghamshire border where the M40 motorway cuts through the Aston Rowant NNR.".
- Chalk_Group thumbnail The_Needles.jpg?width=300.
- Chalk_Group wikiPageExternalLink chalk.htm.
- Chalk_Group wikiPageID "862821".
- Chalk_Group wikiPageRevisionID "603134276".
- Chalk_Group age "Cenomanian to Maastrichtian".
- Chalk_Group country England.
- Chalk_Group extent "southern and eastern England".
- Chalk_Group hasPhotoCollection Chalk_Group.
- Chalk_Group name "Chalk Group".
- Chalk_Group otherlithology Flint.
- Chalk_Group otherlithology Mudstone.
- Chalk_Group overlies Gault.
- Chalk_Group overlies Greensand.
- Chalk_Group overlies Hunstanton_Formation.
- Chalk_Group prilithology Limestone.
- Chalk_Group subunits "Grey Chalk Subgroup, White Chalk Subgroup".
- Chalk_Group thickness "90000.0".
- Chalk_Group type Group_(stratigraphy).
- Chalk_Group underlies Unconformity.
- Chalk_Group subject Category:Chalk.
- Chalk_Group subject Category:Cretaceous_paleontological_sites_of_Europe.
- Chalk_Group subject Category:Geology_of_England.
- Chalk_Group subject Category:Petroleum_geology.
- Chalk_Group type CretaceousPaleontologicalSites.
- Chalk_Group type GeographicalArea108574314.
- Chalk_Group type Location100027167.
- Chalk_Group type Object100002684.
- Chalk_Group type PhysicalEntity100001930.
- Chalk_Group type Region108630985.
- Chalk_Group type Site108651247.
- Chalk_Group type Tract108673395.
- Chalk_Group type YagoGeoEntity.
- Chalk_Group type YagoLegalActorGeo.
- Chalk_Group type YagoPermanentlyLocatedEntity.
- Chalk_Group comment "The Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the late Cretaceous limestone succession in southern and eastern England. The same or similar rock sequences occur across the wider northwest European chalk 'province'. It is characterised by thick deposits of chalk, a soft porous white limestone, deposited in a marine environment.Chalk is a limestone that consists of coccolith biomicrite.".
- Chalk_Group label "Chalk Group".
- Chalk_Group label "Krijtkalk Groep".
- Chalk_Group sameAs Krijtkalk_Groep.
- Chalk_Group sameAs m.03jdl7.
- Chalk_Group sameAs Q2448110.
- Chalk_Group sameAs Q2448110.
- Chalk_Group sameAs Chalk_Group.
- Chalk_Group wasDerivedFrom Chalk_Group?oldid=603134276.
- Chalk_Group depiction The_Needles.jpg.
- Chalk_Group isPrimaryTopicOf Chalk_Group.