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(au lak’ ∂ j∂n) Failed arm (q.v.). Proterozoic grabens trending at a large angle to adjacent continental margins, generally filled with relatively undeformed sediments. See Moores and Twist[1].


  1. Moores, Eldridge (2014). Tectonics. Long Grove, Illinois: Waveland Press. p. 40. ISBN 978-1-4786-2199-7.

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