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The Chalk Group is now divided into a White Chalk Subgroup and a Grey Chalk Subgroup, both of which are further subdivided into formations.These modern divisions replace numerous earlier divisions, references to which occur widely on geological maps and in other geological literature.
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 ...
Chalk Downs, pale green (6) Geological section from north to south The geology of East Sussex is defined by the Weald–Artois anticline , a 60 kilometres (37 mi) wide and 100 kilometres (62 mi) long fold within which caused the arching up of the chalk into a broad dome within the middle Miocene , [ 1 ] which has subsequently been eroded to ...
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 ...
It is located between Swyre Head and Durdle Door to the east, and Chaldon Hill and White Nothe to the west. [1] [2] At the base of the headland is the small Bat's Cave. The chalk in Bat's Head is vertical. Part of the chalk is referred to as Lewes Nodular Chalk Formation, and is part of the "White Chalk Subgroup" of the "Chalk Group". [3]
Both were traditionally referred to the ‘Upper Chalk’ but are now classed as parts of the ‘White Chalk Subgroup’ as part of the broader Chalk Group. [ 51 ] Overlying the chalk both within the Wantsum Channel and in patches on the surface of the Isle itself are the 100 m (330 ft) thick sands , silts and clays of the Palaeogene age Thanet ...
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 ...