Precambrian crystalline basement metamorphic sequences underlie most of the central and eastern mainland of Equatorial Guinea while Mesozoic, Neogene and Quaternary sediments are exposed along its coastal and western zone. The basement sequences are part of the Congo Craton and comprise granitic-gneiss, greenstone, schist-amphibolite and, dominantly younger, undifferentiated granitoids. The Atlantic Ocean volcanic islands of Pagalu (Annobon) and Bioko (Fernando Poo) are part of the Cameroon Volcanic Line (CVL).

Geological: (2 maps);

  • Mapa geologico de Guinea ecuatorial continental/Geological map of continental Equatorial Guinea (1996) 1:400,000
  • Bosquejo geologico de la Guinea continental Española (1946), Instituto Geologico-Minero de España 1:400,000

US Army topographic Rio Muni, (1963) 1: 1 000 000 available at

Source: Geological overview, Schlüter, 2008


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