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What are cross beds?

Updated: 11/17/2022
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15y ago

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sloping layers of sedimentary rock build up; for example, wind can pile up sand as hill or ridges aka dune As mineral grains of diverse color and composition are blown across the dune, discernible layering can develop, inclined at an angle parallel to the slope of the dune. Such angled layers also develop in sand bars and stream deltas. Geologists refer to this as "cross-bedding" because it cuts across the direction of ordinary horizontal bedding. Sets of cross-beds often develop. For example, at any given point in a stream, periods of deposition may alternate with periods of erosion as the velocity of the wind or water changes. A set of cross-beds in a bar will be truncated by erosion, then covered by another set of cross-beds when deposition resumes.

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Q: What are cross beds?
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