Example of seismically imaged ancient continental lithospheric sutures that have persisted into the present. The left-most portion of the figure shows lithospheric fabric from the controlled vibroseis source SNORCLE experiment. The right part of the figure, based on passive-source imaging of signals from distant earthquakes, shows these sutures extending under the ~ 2.7 Ga Slave craton in western Canada to depths exceeding 200 km. (Image courtesy of M. Bostock.)