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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 .
The Weald–Artois Anticline, or Wealden Anticline, is a large anticline, a geological structure running between the regions of the Weald in southern England and Artois in northern France. The fold formed during the Alpine orogeny , from the late Oligocene to middle Miocene as an uplifted form of the Weald basin through inversion of the basin.
The geological map shows the High Weald in lime green (9a). The Low Weald, [18] the periphery of the Weald, is shown as darker green on the map (9), [19] and has an entirely different character. It is in effect the eroded outer edges of the High Weald, revealing a mixture of sandstone outcrops within the underlying clay.
It is a well-wooded zone almost entirely within the Caps et Marais d'Opale Regional Natural Park and is the east end of the Weald-Artois Anticline. [ 1 ] [ 2 ] Its coast all faces west to the English Channel ( la Manche ), apart from a short north coast, including the small beach of Cap Gris-Nez which faces the Strait of Dover ("le Pas de Calais").
For much of its history the Weald had been slowly subsiding basin, but the growth of the Alpine Chain to the south during the Cenozoic caused a reactivation of the Variscan basement basin-bounding faults, the rocks were arched into a broad anticline which stretched across the English Channel to Northern France, the Weald–Artois anticline.
The peripheral areas are mostly of softer sandstones and clays and these form the gentler rolling landscape of Low Weald, of which the Vale of Kent is a part. [1] The Weald-Artois Anticline continues some 65 km (40 mi) further south-eastwards under the Straits of Dover, and includes the Boulonnais of France.
The Greensand Ridge, formed of Lower Greensand, much of which is sandstone and where hardest is locally termed Bargate stone, is a remnant of the Weald dome, part of the great Weald-Artois Anticline that runs from south-east England into northern France. The Weald dome consists of a series of geological strata laid down in the Cretaceous that ...
Artois (/ ɑːr ˈ t w ɑː / ar-TWAH, French:; Dutch: Artesië; Picard: Artoé; English adjective: Artesian) is a region of northern France.Its territory covers an area of about 4,000 km 2 and it has a population of about one million.