Stream terrace
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Stream Terraces are features, often flood plaines, left behind from periods when the stream was flowing at a different water level. Most often they appear as plateaus on existing valley walls and indicate remnant water levels. The changes in water levels can be do to changes in the base level (elevation of the lowest point in the stream system, usually the drainage basin) of the stream system which leads to headward erosion along the length of the stream gradually lowering the water level. The decreased water level can also be due to a decrease in stream discharge due to changes in climate, typical of areas which were covered by ice during periods of glaciation, and their adjacent drainage basins.