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Section across southern England showing the inverted nature of the Weald Basin. The Weald Basin (/ ˈ w iː l d /) is a major topographic feature of the area that is now southern England and northern France from the Triassic to the Late Cretaceous. Its uplift in the Late Cretaceous marked the formation of the Wealden Anticline.
These ridges are the remains of the Wealden dome, a denuded anticline across Kent, Surrey and Sussex, which was the result of uplifting caused by the Alpine movements between 10-20 million years ago. The dome was formed of an upper layer of Chalk above subsequent layers of Upper Greensand, Gault, Lower Greensand, Weald Clay and the Hastings Beds.
The Wadhurst Clay Formation is a geological unit which forms part of the Wealden Group and the middle part of the now unofficial Hastings Beds.These geological units make up the core of the geology of the High Weald in the English counties of West Sussex, East Sussex and Kent.
Weald is specifically a West Saxon form; wold is the Anglian form of the word. [1] The Middle English form of the word is wēld, and the modern spelling is a reintroduction of the Old English form attributed to its use by William Lambarde in his A Perambulation of Kent of 1576. [2]
These geological units make up the core of the Weald in the English counties of East Sussex and Kent. The other component formations of the Hastings Beds are the overlying Wadhurst Clay Formation and the Tunbridge Wells Sand Formation. The Hastings Beds in turn forms part of the Wealden Supergroup which underlies much of South East England.
High Rocks is a key geomorphological site for sandstone weathering features developed on the highest cliffs in the Weald.The Ardingly Sandstone has suffered gentle deformation, and joints have opened out to form spectacular gulls (tension cracks) which are wide enough in places for a person to enter.
The Tunbridge Wells Sand Formation is a geological unit which forms part of the Wealden Group and the uppermost and youngest part of the unofficial Hastings Beds.These geological units make up the core of the geology of the Weald in the English counties of West Sussex, East Sussex and Kent.
A common geomorphological, chiefly dependent on the local hydrology such as hydraulic action, at the base of the Lower Greensand is an escarpment, where the Hythe Beds overlie the Atherfield and Weald Clays, which is particularly susceptible to landslide. [6] Most slip is attributed to massive sandstones overlying weaker shales and clays.