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
South East England in Horley, Surrey, north-east of Gatwick Airport, and NHS South Central (for the west of the region), on the Newbury Business Park in the east of Newbury, off the A4. Similarly there is the South East Coast Ambulance Service on the B2163 at Coxheath (for Kent), on the A217 at Banstead (for Surrey), and on the A277 in Lewes (for Sussex). The South Central Ambulance Service is headquartered on the B4100 next to Bicester Town railway station, with offices at Otterbourne, Hampshire and Wokingham. The charity-funded air ambulances are Kent Air Ambulance at Marden, Kent; Hampshire & Isle of Wight