Page "Solent" Paragraph 18
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Wikipedia
Ten thousand years ago a band of relatively resistant Chalk rock, part of the Southern England Chalk Formation ran from the Isle of Purbeck area of south Dorset to the eastern end of Isle of Wight, parallel to the South Downs.
Through these weak soils and rocks ran many rivers, from the Dorset Frome in the west and including the Stour, Beaulieu River, Test, Itchen and Hamble, which created a large estuary flowing west to east and into the English Channel at the eastern end of the present Solent.
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