Greenstone belts are dominated by volcanic rocks in the lower and middle parts, and sedimentary rocks in the upper part.

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This statement is generally true for greenstone belts, which are regions of volcanic and sedimentary rocks that typically form in ancient (Archean) cratons. The lower and middle parts are dominated by mafic and ultramafic volcanic rocks, which can include basalt and komatiite, while the upper parts are dominated by sedimentary rocks such as banded iron formations and chert. However, there can be variation in the rock types and stratigraphy, and not all greenstone belts follow this pattern.

Greenstone Belts Are Dominated by Volcanic Rocks in the Lower