A single hardground may have been exhumed 16 or more times before the sediments were compacted and hardened ( lithified) to form chalk. Hardgrounds are thought to reflect disruptions in the steady accumulation of sediment when sedimentation ceased and/or the loose surface sediments were stripped away by currents or slumping, exposing the older hardened chalk sediment. In some areas, layers of soft, grey chalk known as a hardground complex can be seen. Several different ocean floor species such as brachiopods, bivalves, crinoids, and sponges can be found in the chalk deposits, as can sharks' teeth.

Quartz silica filled cavities left by dead marine creatures which are found as flint fossils, especially the internal moulds of Micraster echinoids. The cliffs' chalk face shows horizontal bands of dark-coloured flint which is composed of the remains of sea sponges and siliceous planktonic micro-organisms that hardened into the microscopic quartz crystals. At the end of the last glacial period, around 10,000 years ago, rising sea levels finally severed the last land connection. A land connection across the southern North Sea existed intermittently at later times when periods of glaciation resulted in lower sea levels. The land masses remained connected until between 450,000 and 180,000В years ago when at least two catastrophic glacial lake outburst floods breached the anticline and destroyed the ridge that connected Britain to Europe. Until the end of the last glacial period, the British Isles were part of continental Europe, linked by the unbroken Weald-Artois Anticline, a ridge that acted as a natural dam to hold back a large freshwater pro-glacial lake, now submerged under the North Sea. Written in 1941 by Walter Kent and Nat Burton, the song was also among the most popular Second World War tunes.Due to the Alpine orogeny, a major mountain building event during the Cenozoic, the sea-floor deposits were raised above sea level. (There'll Be Bluebirds Over) The White Cliffs of Dover - was a popular World War II song made famous by Vera Lynn with her 1942 recording one of her best known recordings. The White Cliffs of Dover - Filmdaten Originaltitel The White Cliffs of Dover Produktionsland Vereinigte Staaten вЂ¦ Deutsch Wikipedia They are often the first thing people see when they arrive in England by boat from continental Europe вЂ¦ Usage of the words and phrases in modern English White cliffs of Dover, the - white cliffs of Do|ver, the the tall white cliffs along the coast of southern England near Dover. White Cliffs of Dover (disambiguation) - Cliffs of Dover may refer to: White Cliffs of Dover, cliffs which form part of the coastline of England, facing the Strait of Dover The White Cliffs of Dover (1944 film), a romance concerning an American woman who travels to England, based on aвЂ¦ вЂ¦ Wikipedia White cliffs of Dover - white cliffs that rise out of the sea at Dover (England) вЂ¦ English contemporary dictionary They can be seen from several miles away at sea, so they are the first part of England that people see as they approach Dover by ship. White cliffs of Dover - n the tall chalk cliffs on the south eastern coast of England, around the port of Dover.

The cliff face, which reaches up to 106 metres high, owes its striking faГ§adeвЂ¦ вЂ¦ Wikipedia The cliffs are part of the North Downs formation.

White cliffs of Dover - The white cliffs of Dover are cliffs which form part of the British coastline facing the Strait of Dover and France. For other uses, see White Cliffs of Dover (disambiguation). White Cliffs of Dover - This article is about the geographical feature. White Cliffs of Dover - White Cliffs of Do|ver 1.) the White Cliffs of Dover the white cliffs made of в†‘chalk, which are the first part of England that you see when crossing the в†‘English Channel from France 2.) a popular song sung by British singer Vera Lynn during World вЂ¦ Dictionary of contemporary English

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