Deep crustal, and even upper mantle, features not only represent a special record of the formation and deformation of the earth's lithosphere, they greatly influence the evolution of strata accessible at shallower depths. For example, in many areas of the world, the lower crust is characterized by subhorizontally stratified reflector sequences which have been variously hypothesized to be shear zones, mafic intrusive rocks, and even fluid-filled fractures.

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