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Volcanic activity in rift valleys is important in several different ways to both geology and. archaeology. First, the rocks, such as rhyolite and basalt, and also ashes are important for. correlation and dating the deposits and archaeological sites in rift valleys.olcanic activity in rift valleys is important in several different ways to both geology and. archaeology. First, the rocks, such as rhyolite and basalt, and also ashes are important for. correlation and dating the deposits and archaeological sites in rift valleys.
A rift valley is formed when pieces of the Eaâ¦rth's crust move apart from each other. V-shaped valleys are formed by the erosive effects of running water and U-shaped valleys are formed by the erosive effects of flowing glacial ice. Rift valleys occur as lithospheric plates are diverging, creating a gap between land masses which is being infilled with rising decompression melted basaltic magma and lava.