Ancient DNA Reveals Prehistoric Forest Beneath North Sea Was Major Ice Age Refuge
Researchers using ancient DNA (sedaDNA) analysis have discovered that Doggerland, a sunken landscape beneath the North Sea, hosted lush temperate forests of oak, elm and hazel at least 16,000 years ago—thousands of years earlier than previously thought. The study published in PNAS analyzed 252 sediment samples from 41 marine cores and found DNA from Pterocarya (walnut family) species 400,000 years older than their known extinction date, indicating isolated microrefugia allowed species to persist far longer. The findings suggest Doggerland was a significant refuge for plants, animals and early humans during the last Ice Age, with some parts remaining habitable until 7,000 years ago.