About: Crag Group

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The Crag Group is a geological group outcropping in East Anglia, UK and adjacent areas of the North Sea. Its age ranges from approximately 4.4 to 0.478 million years BP, spanning the late Pliocene and early to middle Pleistocene epochs. It comprises a range of marine and estuarine sands, gravels, silts and clays deposited in a relatively shallow-water, tidally-dominated marine embayment on the western margins of the North Sea basin. The sands are characteristically dark green from glauconite but weather bright orange, with haematite 'iron pans' forming. The lithology of the lower part of the Group is almost entirely flint. The highest formation in the Group, the , contains over 10% of far-travelled lithologies, notably quartzite and vein quartz from the Midlands, igneous rocks from Wales,

Attributes	Values
rdf:type	Band
rdfs:label	Crag Group (en) Crag (sediment) (nl)
rdfs:comment	Een crag of schelpenbank is een laag sediment die bestaat uit grind of grof zand en schelpen of schelpfragmenten. Crags worden gevormd in zeer ondiepe mariene omgevingen, bijvoorbeeld zandplaten waar tijdens een storm schelpen en grind ophopen. Vaak liggen ze over erosievlakken. De naam crag komt uit het zuidoosten van Engeland, waar dergelijke lagen met name in de regio East Anglia veel voorkomen. Voorbeelden zijn: * - Midden-Plioceen * - Laat-Plioceen * (Mammiferous Crag) - Plioceen * (Weybourne Crag) - Vroeg-Pleistoceen (nl) The Crag Group is a geological group outcropping in East Anglia, UK and adjacent areas of the North Sea. Its age ranges from approximately 4.4 to 0.478 million years BP, spanning the late Pliocene and early to middle Pleistocene epochs. It comprises a range of marine and estuarine sands, gravels, silts and clays deposited in a relatively shallow-water, tidally-dominated marine embayment on the western margins of the North Sea basin. The sands are characteristically dark green from glauconite but weather bright orange, with haematite 'iron pans' forming. The lithology of the lower part of the Group is almost entirely flint. The highest formation in the Group, the , contains over 10% of far-travelled lithologies, notably quartzite and vein quartz from the Midlands, igneous rocks from Wales, (en)
name	Crag Group (en)
foaf:depiction
dcterms:subject	Neogene England East Anglia Geologic formations of England Geological groups of the United Kingdom
Wikipage page ID	43378092 (xsd:integer)
Wikipage revision ID	1084549640 (xsd:integer)
Link from a Wikipage to another Wikipage	Quartz List of fossiliferous stratigraphic units in England River Thames East Anglia London Clay Formation Coralline Crag Formation Chert Quartzite Clay Glauconite Great Britain Superficial Deposits Supergroup Neogene England Calcarenite East Anglia Igneous rock Dunwich Group Geologic formations of England Flint Britannia Catchments Group British Coastal Deposits Group Nordsee Norwich Crag Formation Gravel Unconformity dbr:Wroxham_Crag_Formation Geological groups of the United Kingdom Chalk Group Albion Glacigenic Group Bytham River Pleistocene Pliocene Red Crag Formation Sand Silt Lithology Group (geology) Haematite Upper Greensand
sameAs	Crag Group Crag Group Crag Group Crag Group
subunits	Coralline, Red, Norwich & Wroxham Crag Formations (en)
underlies	Dunwich, Albion Glacigenic, Britannia Catchments & British Coastal Deposits Groups (en)
unitof	Great Britain Superficial Deposits Supergroup
year ts	1823 (xsd:integer)
dbp:wikiPageUsesTemplate	dbt:Infobox_rockunit dbt:UK-geologic-formation-stub dbt:Convert dbt:Flag dbt:Reflist dbt:Use_dmy_dates dbt:Fossil_range dbt:England-stub
thumbnail	wiki-commons:Special:FilePath/Red_crag_cliff_at_bawdsey_cliff_suffolk_30-10-2013.jpg?width=300
age	Pleistocene Pliocene ~ (en)
caption	Red Crag Formation at Bawdsey cliff, Suffolk (en)
period	Pliocene (en)
region	East Anglia
Thickness	Up to offshore (en)
type	Geologic group (en)
has abstract	The Crag Group is a geological group outcropping in East Anglia, UK and adjacent areas of the North Sea. Its age ranges from approximately 4.4 to 0.478 million years BP, spanning the late Pliocene and early to middle Pleistocene epochs. It comprises a range of marine and estuarine sands, gravels, silts and clays deposited in a relatively shallow-water, tidally-dominated marine embayment on the western margins of the North Sea basin. The sands are characteristically dark green from glauconite but weather bright orange, with haematite 'iron pans' forming. The lithology of the lower part of the Group is almost entirely flint. The highest formation in the Group, the , contains over 10% of far-travelled lithologies, notably quartzite and vein quartz from the Midlands, igneous rocks from Wales, and chert from the Upper Greensand of southeastern England. This exotic rock component was introduced by rivers such as the Bytham River and Proto-Thames. The constituent formations of the Crag Group are the Coralline Crag (mid to late Pliocene); the Red Crag (late Pliocene / early Pleistocene); the Norwich Crag (early Pleistocene) and the (early to Middle Pleistocene). The sedimentary record is incomplete, leading to difficulties in correlating and dating sequences The term Crag was first used in a geological sense by R.C. Taylor in 1823, a word commonly used in Suffolk to designate any shelly sand or gravel. (en) Een crag of schelpenbank is een laag sediment die bestaat uit grind of grof zand en schelpen of schelpfragmenten. Crags worden gevormd in zeer ondiepe mariene omgevingen, bijvoorbeeld zandplaten waar tijdens een storm schelpen en grind ophopen. Vaak liggen ze over erosievlakken. De naam crag komt uit het zuidoosten van Engeland, waar dergelijke lagen met name in de regio East Anglia veel voorkomen. Voorbeelden zijn: * - Midden-Plioceen * - Laat-Plioceen * (Mammiferous Crag) - Plioceen * (Weybourne Crag) - Vroeg-Pleistoceen (nl)
extent	East Anglia Nordsee
namedby	R.C. Taylor (en)
otherlithology	Clay Calcarenite Gravel Silt
overlies	Unconformity with Chalk Group and London Clay Formation (en)
prilithology	Sand
gold:hypernym	Group
prov:wasDerivedFrom	wikipedia-en:Crag_Group?oldid=1084549640&ns=0
page length (characters) of wiki page	4688 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Crag_Group
is Link from a Wikipage to another Wikipage of	List of fossiliferous stratigraphic units in England List of geological groups of Great Britain Coralline Crag Formation Geology of the Broads Great Britain Superficial Deposits Supergroup Crag Dunwich Group Britannia Catchments Group British Coastal Deposits Group

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