Kettle holes are a series of small depressions filled with lakes or marshes which lie on the outwash plain.
It’s believed they’re formed when blocks of ice, washed onto the plain, melt and leave a gap in the sediments – these holes fill with water to form small lakes.
Aquatic plants become established in the lakes and this leads to the development of a marshy area and eventually peat (partially decaying vegetation).

kettle-hole

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