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The Amazon basin is made up of several different geological areas. There are two upland areas know as shields which are as high as 1000 meters, and these shields are separated by the main river to the east. The shields which are ancient uplands are the Brazilian shield and the Guiana Shield. The rest of the region is a sedimentary basin, that is lower than 1000 meters in elevation, and accounts for 35% of the basins drainage. In some areas the sediment has built up to depths of over 5000 meters. For the source and more detailed information concerning this subject, click on the related links section (The Amazon) indicated below this answer box.

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15y ago

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