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
North Kent Marshes North Kent Marshes The North Kent Marshes, located in the north of the county of Kent on the Thames Estuary in south-east England, is one of 22 Environmentally Sensitive Areas recognised by the UK government's Department for Environment, Food and Rural Affairs (DEFRA). It lies within the Thames Gateway regional planning area. The north of Kent has historically been marshland and the part which still survives, stretching from Dartford in the west, to Whitstable in the east, has been recognised as one of the most important natural wetlands in northern Europe. Monitored by local land owners and wildlife custodians, the