The Atlantic Shield is a large

geological Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other E ...

shield located in eastern

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ...

. The shield is made up of the

craton A craton (, , or ; from grc-gre, κράτος "strength") is an old and stable part of the continental lithosphere, which consists of Earth's two topmost layers, the crust and the uppermost mantle. Having often survived cycles of merging an ...

s of São Luís, São Francisco,

Luís Alves Luís Manuel Rodrigues Alves (born 28 September 1971) is a Portuguese retired footballer who played as a forward. Football career Born in Lisbon, Alves spent the majority of his career playing for third division clubs. He made his professional ...

and

Río de la Plata The Río de la Plata (, "river of silver"), also called the River Plate or La Plata River in English, is the estuary formed by the confluence of the Uruguay River and the Paraná River at Punta Gorda. It empties into the Atlantic Ocean and fo ...

References

Cratons Regions of South America Geology of Argentina Geology of Brazil Geology of Uruguay Geology of South America Natural history of South America Precambrian South America {{plate-tectonics-stub