Geology of Kent into northern France. The fold arises from the continuing Alpine orogeny and results in the general northward dip of the rock strata in most of Kent. There are extensive spreads of coastal and estuarine alluvium on the Thames Estuary coast, in the low ground surrounding the Isle of Thanet and across Romney Marsh. Alluvium also floors the valleys of the River Medway and Stour. 'Clay-with-flints' is a commonly occurring deposit across the North Downs which is a product of periglacial conditions during the last ice age. Loessic deposists, of aeolian origin i.e. windblown, are common in east Kent, especially on
Kent Bowaters Paper Railway. A limited number of charter flights are provided by Lydd Airport at Lydd. However, most passengers across the South East use the larger Heathrow, Gatwick, Stansted and Luton airports. In 2002, it was revealed that the government was considering building a new four-runway airport on the marshland near the village of Cliffe on Hoo Peninsula. This plan was dropped in 2003 following protests by cultural and environmental groups. However further plans for a Thames Estuary Airport on the Kent coast have subsequently emerged, including the Thames Hub Airport, again sited on the Isle of Grain and designed