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"Some problems of the tectonic framework of the Guiana Shield with special regard for the Roraima Formation."
It is found in South America, on the lowlands of the Amazon basin, the Guiana shield, and the Atlantic coastal forest of Brazil.
Komatiites are associated with nickel and gold deposits in Australia, Canada, South Africa and most recently in the Guiana shield of South America.
Then, over the lowlands of greenstones of Precambrian Guiana Shield, the Meamu River, Kurupung River and Eping River join the Mazaruni River.
In southwest Guyana, (the southwest Guiana Shield), the range borders Roraima state, Brazil and the Amazon River, (Rio Negro), tributary, the south-flowing Branco River of central Roraima.
One view is that the Birimian rocks were formed by the collision of the Archean Cupixi-Carajas craton in the Southern Guiana shield and the Kenema-Man craton in the Western Africa shield.
The Guiana Shield in South America is a massive granite dome that formed 2 billion years ago and forms what is now Guyana, Surinam, French Guiana and parts of Venezuela, Colombia and Brazil.
The Iwokrama Forest is nearly 3710 square kilometers (1430 mile2) of central Guyana located in the heart of the Guiana Shield, one of the four last pristine tropical forests in the world, (Congo, New Guinea, and Amazonia being the others).
