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The Grey Chalk Subgroup (formerly the Lower Chalk minus the Plenus Marls) is usually relatively soft and greyish in colour. It is also the most fossiliferous (especially for ammonite fossils). The strata of this subgroup usually begin with the ' Glauconitic Marl Member' (formerly known as the Glauconitic or Chloritic Marl), named after the ...
The Chalk Group which includes all of the different units which make up the succession in England, is subdivided into an earlier/lower Grey Chalk Subgroup and a later/higher White Chalk Subgroup. The Chalk has previously been subdivided in other ways and references to Upper, Middle and Lower abound in the literature and on geological maps.
Overlying the Selborne Group is the Chalk Group, a suite of limestones of Upper Cretaceous age which is formally divided into a lower/older Grey Chalk Subgroup (of Cenomanian age) and an upper/later White Chalk Subgroup (of Cenomanian to Campanian age). The Grey Chalk corresponds to the traditional Lower Chalk division and comprises 15-25m of ...
The Wealden Group is overlain by the Chalk Group, which is subdivided into the White Chalk Subgroup and the Grey Chalk Subgroup. Each of the subgroups is in turn subdivided to formation level. Each of the subgroups is in turn subdivided to formation level.
The Grey Chalk Subgroup and finally the White Chalk Subgroup overlie these and form the North Downs which run from the famous White Cliffs at Dover west-northwestwards above Ashford and Maidstone before turning slightly south of west at the Medway gap towards Sevenoaks. The succession can be listed with modern stratigraphic terminology thus ...
Two subsections of England's famous chalk formation, the Grey Chalk Subgroup and the lower sections of the White Chalk Subgroup, yield three-dimensionally preserved fossils of marine fishes. This exquisite level of preservation is unlike fish fossils from other deposits from around the same time, which are only preserved as two-dimensional ...
Burnham Chalk formation; Welton Chalk Formation; Grey Chalk Subgroup Ferriby Chalk Formation; Hunstanton Chalk Formation; The thin Hunstanton Chalk and the Ferriby Chalk formations form much of the west facing Wolds scarp but it is the overlying Welton Chalk Formation which forms the greater part of the easterly dip-slopes with the Ferriby ...
To the south of the Humber Gap, where the chalk provides stable footings for the Humber Bridge, the same formations continue as the Lincolnshire Wolds. The rock succession in stratigraphic order i.e. youngest/uppermost first, is this: White Chalk Subgroup Flamborough Chalk Formation; Burnham Chalk formation; Welton Chalk Formation; Grey Chalk ...