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Gregory Rift
The Gregory Rift is the eastern branch of the East African Rift fracture system.
The rift is being caused by the separation of the Somali plate from the Nubian plate, driven by a thermal plume. Although the term is sometimes used in the narrow sense of the Kenyan Rift, the larger definition of the Gregory Rift is the set of faults and grabens extending southward from the Gulf of Aden through Ethiopia and Kenya into Northern Tanzania, passing over the local uplifts of the Ethiopian and Kenyan domes.
Ancient fossils of early hominins, the ancestors of humans, have been found in the southern part of the Gregory Rift.
== Etymology ==
Named in honour of the British geologist John Walter Gregory who explored the geology of the rift in 1892-93 and 1919.〔http://sp.lyellcollection.org/content/6/1/1.full.pdf〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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