Aulacogen

An aulacogen is a failed arm of a triple junction.[1] Aulacogens are a part of plate tectonics where oceanic and continental crust is continuously being created, destroyed, and rearranged on the Earth’s surface. Specifically, aulacogens are a rift zone, where new crust is formed, that is no longer active.[2]

For the insect, see Aulacogenia.
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