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In page Geology:

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Extension causes the rock units as a whole to become longer and thinner. This is primarily accomplished through normal faulting and through the ductile stretching and thinning. Normal faults drop rock units that are higher below those that are lower. This typically results in younger units ending up below older units. Stretching of units can result in their thinning.[9] In fact, at one location within the Maria Fold and Thrust Belt, the entire sedimentary sequence of the Grand Canyon appears over a length of less than a meter.[citation needed] Rocks at the depth to be ductilely stretched are often metamorphosed. These stretched rocks can pinch into lenses, known as boudins, after the French word for "sausage" because of their visual similarity.