A fjord is formed when a glacier cuts a U-shaped valley by ice segregation and abrasion of the surrounding bedrock. Glacial melting is accompanied by the rebounding of the Earth's crust as the ice load and eroded sediment is removed (also called isostasy or glacial rebound).n the Danish language any inlet is called a fjord, but none of the fjords of Denmark may be considered a fjord in the geological sense. Limfjord in English terminology is a sound, since it separates the North Jutlandic Island (Vendsyssel-Thy) from the rest of Jutland.