Waalian interglacial

The Waalian interglacial (German: Waal-Warmzeit or Waal-Interglazial) or Waalian Stage was an interglacial period of the Early Pleistocene in north-west Europe. It was preceded by the Eburonian Stage and succeeded by the Menapian Stage. It coincides with part of the much longer Beestonian stage in Britain. It is variously dated by different authorities. Oxford Reference gives 1.3 to 0.9 million years ago and the British Geological Survey 1.6 to 1.36 million years ago. However, the 2020 chart of the international authority on stratigraphic dating, the International Commission on Stratigraphy shows it as c. 1.6 to 1.4 million years ago. It is distinct from other Pleistocene periods in its complexity, vegetational composition, and vegetational succession.

Its name is derived from a major branch of the Rhine delta, the Waal.

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