The underlying strata of the state are of Cretaceous age and are covered by alluvial deposits of Tertiary and post-Tertiary origin. A large part of Louisiana is the creation and product of the Mississippi River. It was originally covered by an arm of the sea, and has been built up by the silt carried down the valley by the great river.
Near the coast, there are many salt domes, where salt is mined and oil is often found. Salt domes also exist in North Louisiana.
Due both to extensive flood control measures along the Mississippi River and natural subsidence, Louisiana is now suffering the loss of coastal land area. State and federal government efforts to halt or reverse this phenomenon are underway; others are being sought. There is one bright spot, however; the Atchafalaya River is creating new delta land in the South-Central portion of the state. This active delta lobe also indicates that the Mississippi is seeking a new path to the Gulf. Much engineering effort is devoted to keeping the river near its traditional route, as the state's economy and shipping depends on it.
[edit] Geographic and statistical areas
Louisiana is divided into 64 parishes (the equivalent of counties in most other states). The term "parish" is unique to Louisiana and is due to its French / Spanish heritage; the original boundaries of the civilian county governments were coterminous with the local Roman Catholic parishes
poker ligneslot casino