The Guiana Shield underlies Guyana (previously British Guiana), Suriname (previously Dutch Guiana), and French Guiana (or Guyane), much of southern Venezuela, as well as parts of Colombia and Brazil. The rocks of the Guiana Shield consist of metasediments and metavolcanics (greenstones) overlain by sub-horizontal layers of sandstones, quartzites, shales and conglomerates intruded by sills of younger mafic intrusives such as gabbros.[3]
The Guiana Shield is one of the most intact eco-regions in the world dominated by tropical rainforest. The ecosystems of the Guiana Shield region of South America (hereinafter referred to as the Guiana Shield eco-region) stretch from Colombia in the west through to the State of Amapá in Brazil in the east and includes French Guyana, Suriname, Guyana and a large part of Venezuela
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