To the east of the Liberia is a Birimian-age proto-continent that accreted onto Africa

during the Eburnean Orogeny.  Pan African units extend along the southern edge of

the country, representing the formation of Gondwana.

The west of Liberia is underlain by Archean granites and granitic gneisses, as well as

greenstone belts (metamorphosed mafic and ultramafic rocks, bounded by granites

and gneisses suites representing the remains of volcanic belts).

The Archean rocks have been subjected to deformation and shearing, with the principal

structures acting as conduits for mineralizing fluids which features rich gold deposits.

A major, crustal scale, north-westerly-trending shear zone in the south-western

part of the country cuts across the regional trend of the Archean mountain belt.

The interference of these two tectonic elements produced complex structures

with a strong rotational component of deformation and formed large and long-lived

traps for mineralization.