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
Kingdom of Kent Kingdom of Kent The Kingdom of the Kentish (; ), today referred to as the Kingdom of Kent, was an early medieval kingdom in what is now South East England. It existed from either the fifth or the sixth century CE until it was fully absorbed into the Kingdom of England in the tenth century. Under the preceding Romano-British administration the area of Kent faced repeated attacks from seafaring raiders during the fourth century CE. It is likely that Germanic-speaking "foederati" were invited to settle in the area as mercenaries. Following the end of Roman administration, in 410, further linguistically