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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.
Volcanic Activity in the Danakil Depression. Much of the floor of the Danakil Depression is covered by salt flats. Other areas are covered by basalt flows, shield volcanoes, and cinder cones. Several craters up to a mile across can be seen on the salt flats. These are thought to be maars formed by phreatic eruptions.