At the end of the glaciation period, runoff from the melting glaciers and rainwater collects in the rock basin, forming a ribbon lake. This debris, which collects around the borders of the rock basin, is made up of silt, rock, and other sediments. Additionally, the glacier leaves behind debris (known as moraine) picked up while moving through the valley. These rock basins take on the long and narrow shape of the original river valley. The result is a depressed area, known as a rock basin.
Since the surrounding rock is harder than the valley floor, it is not easily eroded and remains at a higher elevation, untouched by the glacier. As the glacier moves, it picks up large rocks and boulders, which slide under the glacier, causing erosion by abrasion as the glacier slides along the valley. This shape leads to erosion of the valley floor, particularly where the thickened ice meets softer rock.
Glaciers become wider and deeper than the surrounding valley. These lakes typically originate in ancient river valleys, where glaciers were formed during periods of glaciation. Ribbon lakes are the perfect example of the effects of glacial erosion on the surface of the Earth. The result is referred to as a ribbon lake. These moraines act as natural dams, which allow rainwater and glacial melt to build up in the depressed area. In most cases, the depressed area that holds the ribbon lake is located below elevated moraines, which are collections of debris left by glaciers. Geologically speaking, a ribbon lake sits within a rock basin, which is an area of soft rock that sits at a low elevation and is surrounded by an area of hard rock that sits at a higher elevation. The term ribbon lake is used to describe a lake that runs longer than it does wide. What Is a Ribbon Lake? Windermere is a ribbon lake in England's Lake District National Park.
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