Guiana Shield | geological region, South America | Britannica (original) (raw)

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Colombia

• 
  In Colombia: Relief
  …eroded rocks of the ancient Guiana Shield are exposed, producing a broken topography of low, isolated mountains, tablelands, and buttes with rapids in the streams. This slightly higher ground forms the watershed between the Amazon and Orinoco systems. Some 60 miles (100 km) south of Villavicencio the elongated, forested La…
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continental shields

• In continental shield
  …Amazonian Shield are designated the Guiana and Platian shields, respectively.
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signficance to Guianas

• 
  In The Guianas
  …south to north: the Precambrian Guiana Shield, a region of low mountains that lies along the southern borders of the three states and rises to the region’s highest point, Mount Roraima, 9,094 feet (2,772 metres); a lower region of hilly country covered by a tropical hardwood forest and occasional savanna…
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