The Gedamsa Caldera is a 7 x 9 km caldera in the Main Ethiopian Rift valley. The caldera has steep sides with 100–200 metres (328–656 ft) high walls, the upper parts of which consist predominantly of rhyolitic lava flows deposited in a series of trachite ignimbrite eruptions. There are small basaltic spatter cones and fumarolic activity inside the caldera floor along with a series of (Late Pleistocene to Holocene) rhyolite and pumice deposits and a Holocene lava dome/flow.[1]

Gedamsa Caldera
the Gedamsa Caldera lies east of Lake Koka and SW of a Sugar farm
Highest point
Elevation	1,984 m (6,509 ft)[1]
Coordinates	8°21′00″N 39°10′48″E[1]
Geography
Gedamsa Caldera Ethiopian Rift Valley,  Ethiopia
Geology
Mountain type	Caldera
Last eruption	Holocene[1]

References

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