TN postcode area TN postcode area The TN postcode area, also known as the Tunbridge Wells postcode area, is a group of 40 postcode districts in England, which are subdivisions of 24 post towns. These postcode districts cover an extensive area from the Greater London border at Westerham to the Sussex coast, including south Kent (including Royal Tunbridge Wells, Tonbridge, Ashford, Sevenoaks, Cranbrook, Edenbridge, New Romney, Romney Marsh and Tenterden) and northern and eastern East Sussex (including Hastings, Battle, Bexhill-on-Sea, Crowborough, Etchingham, Hartfield, Heathfield, Mayfield, Robertsbridge, Rye, St Leonards-on-Sea, Uckfield, Wadhurst and Winchelsea). Additionally, small parts of TN14 and TN16 cover the rural
Geology of the Lassen volcanic area south and east, reaching the head of Warner Valley. By this time, the park's eastern portion had been transformed into a relatively flat plain. The activity was followed by an eruption of the Eastern basalts from volcanoes east of the park. These thick flows have subsequently eroded to produce rugged hills that limit the park on the east. Taken together, these various flows built the lava plateau that the Lassen volcanic area is located on. From 600,000 to 400,000 years ago, eruptions built a large conical stratovolcano called Mount Tehama (also called Brokeoff Volcano) in what is now the southwest