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In between the Tertiary rocks of the north, and the relatively new sediments along the coast, is a vast belt known as the Pleistocene Terraces.Their age and distribution can be largely related to the rise and fall of sea levels during past ice ages.
Through a peculiarity of the political geography of the United States, this is substantially less than the 9-mile (14 km)-wide jurisdiction of nearby states Texas and Florida, which, like Louisiana, have extensive Gulf coastlines.
The breadth of the alluvial region along the Mississippi is from 10 to 60 miles (15 to 100 km), and along the other rivers, the alluvial region averages about 10 miles (15 km) across.
The Mississippi River flows along a ridge formed by its own natural deposits (known as a levee), from which the lands decline toward a river beyond at an average fall of six feet per mile (3 m/km).
is a state in the southeastern region of the United States.
It is the 31st in size and the 25th most populous of the 50 United States. with political subdivisions termed parishes, which are the local government's equivalent to counties.
In general, the northern terraces have had sufficient time for rivers to cut deep channels, while the newer terraces tend to be much flatter. Their origin can be traced back to the early Gulf of Mexico, when the shallow ocean had high rates of evaporation.