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BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Jurassic
 ....Middle Jurassic
 .....Bajocian
 ......Broom Formation
RTAalenian
 Brent Group
 North Sea
SNAt the base of the Brent Group. North Sea region. Added to Thesaurus in 1995.