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in age.

Geomorphology

There are three upland areas of the Guiana Shield:
# The Guiana Highlands proper are in Venezuela east of the Orinoco and extend across much of west-central Guyana and into the northern Roraima state in Brazil.
# The Tumucumaque Uplands are a series of central massifs in an arc from the Wilhelmina Mountains of south-central Suriname, along the southern boundary of Suriname and Guyana,

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