This breakdown is basically the same as Major D.O. Elliott used in his examination of the river and the improvement he tried to do in 1932 on the lower Mississippi. The first of the four periods is in a category of pre-federal involvement. Next, the second period extends until the creation of the Mississippi river commission. The third one covers the entirety of the operation of the Mississippi river commission until the flood control act of 1928 was passed. The fourth and final period will cover the river development until the present date. There is controversy over who was the first white man to discover and map the Mississippi river and who should take credit for it. Most historians claim that Hernando De Soto discovered the river, but when they found the “admiral’s map” which shows the Mississippi and land around it which was found at the royal library in Madrid, it shows to support the claim that the Mississippi was not discovered by De Soto but by Columbus instead. In the year 1502 Columbus departed from Spain on his fourth voyage, which was the voyage that he landed at Santo Domingo and then continued on …show more content…
There is a special method that was used to determine the sources of terrestrially derived organic carbon, and this process is called tetramethylammonium hydroxide thermochemolysis method. Most of the lignin-derived materials in muddy sediments appeared to be derived from non-woody grass-like sources which decays much quicker than logs or other woody materials that are typically found in sandy deposits. The great amounts of tiny sand-sized woody materials found in the sandy sediments are likely made from woody plant