A groundbreaking study has unveiled evidence of lush prehistoric forests thriving in what is now the southern North Sea, challenging long-held views on Europe's landscape during the last Ice Age. Led by researchers at the University of Warwick, the discovery in Doggerland—a vast submerged landmass that once bridged Britain and continental Europe—suggests this 'lost world' was a habitable refuge far earlier than previously imagined. By analyzing ancient DNA preserved in seabed sediments, scientists have detected temperate trees and wildlife dating back over 16,000 years, painting a picture of a wooded haven amid glacial harshness.
This revelation not only reshapes our understanding of Ice Age ecology but also hints at how early human communities might have navigated northern Europe's dramatic environmental shifts. As sea levels rose around 8,000 years ago, Doggerland vanished, severing the connection between islands and mainland. Yet, its preserved genetic secrets, extracted from marine cores, offer a window into a dynamic prehistoric ecosystem that supported life against the odds.
🌿 Uncovering Doggerland: Europe's Sunken Land Bridge
Doggerland, spanning roughly the size of modern-day Denmark and the Netherlands combined, emerged during the Last Glacial Maximum when lowered sea levels exposed a fertile plain rich in rivers, lakes, and marshes. Named after the Dogger Bank—a shallow fishing ground where ancient artifacts occasionally surface—it connected East Anglia to the Low Countries and southern Scandinavia. For millennia, it served as a migration corridor for animals and hunter-gatherers during the Paleolithic and Mesolithic periods.
Traditionally viewed as a tundra-dominated bridge post-dating the ice sheets' retreat around 11,700 years ago, Doggerland's story gained traction in the 20th century through dredged mammoth bones, harpoons, and pollen traces. Submersion began gradually with post-glacial meltwater but accelerated after the catastrophic Storegga Slide tsunami around 8,150 years ago. Recent modeling by projects like the Lost Frontiers initiative has reconstructed its contours, revealing a riverine paradise dotted with hills and estuaries.
Before this latest find, evidence pointed to open grasslands supporting megafauna like woolly mammoths and reindeer. The new data flips this narrative, indicating pockets of woodland persisted or emerged much sooner, fostering biodiversity in an otherwise frigid Europe.
The Groundbreaking SedaDNA Study
Spearheaded by Professor Robin Allaby at the University of Warwick's School of Life Sciences, the research team—including experts from the University of Bradford, Durham University, and international collaborators—examined 252 sedimentary ancient DNA (sedaDNA) samples from 41 marine cores. These cores, drilled along the trace of an ancient 20-mile-long Southern River in southern Doggerland, captured layered sediments spanning from the late glacial period to full inundation.
SedaDNA, genetic material shed by plants, animals, and microbes into soil and preserved in anoxic seabed conditions, allows reconstruction of past ecosystems without physical fossils. The team distinguished 'secure' fine silt samples (local DNA sources) from 'insecure' coarser sands (transported material), ensuring accurate paleo-environmental signals. Published in the Proceedings of the National Academy of Sciences (PNAS), the study marks the largest sedaDNA effort of its kind.
Professor Vincent Gaffney from Bradford emphasized Doggerland's evolution from 'mere land bridge' to prehistoric heartland: 'It acted as a fulcrum for how communities resettled northern Europe over millennia.' This interdisciplinary approach blends genetics, geophysics, and archaeology, highlighting European higher education's prowess in submerged landscape studies.
Key Findings: Temperate Forests Against the Ice
The sedaDNA signatures revealed oak (Quercus), elm (Ulmus), and hazel (Corylus) woodlands flourishing over 16,000 years ago—several millennia before pollen records from Britain suggested tree recolonization. Lime trees (Tilia) appeared around 2,000 years earlier than on the mainland, while DNA from Pterocarya—a walnut relative presumed extinct in the region for 400,000 years—shocked researchers, indicating remarkable persistence.
These warmth-loving species point to microclimatic refugia: sheltered valleys or riverine oases where temperatures were milder, shielded from full glacial aridity. Southern Doggerland endured longer than thought, with parts above water until approximately 7,000 years ago, post-Storegga tsunami. This timeline refines models of North Sea formation, showing gradual rather than abrupt flooding.
Wildlife and Biodiversity in the Lost Realm
Beyond trees, animal DNA traces boars, deer, bears, and aurochs—large wild cattle—populating these forests. This mosaic of woodland, wetland, and open areas likely teemed with prey species, attracting Paleolithic hunters. The presence of such megafauna supports a productive ecosystem capable of sustaining herds and predators, contrasting the barren tundra envisioned for Ice Age northwest Europe.
Professor Allaby noted: 'We got evidence of boars, deer, bears, aurochs,' underscoring the richness. These findings align with sporadic Mesolithic artifacts like barbed points dredged from fishing trawls, suggesting human exploitation of forested river mouths—prime settlement spots rich in fish, game, and timber.
Solving Reid's Paradox: Microrefugia Explained
A century-old puzzle, Reid's Paradox questions how temperate trees like oak spread across northern Europe within centuries post-glaciation, far faster than seed dispersal models predict. Doggerland's early forests provide the answer: glacial refugia where species hunkered down, ready to expand as ice retreated. Lime and hazel, detected ahead of British timelines, likely radiated from these southern strongholds.
This has broad paleoecological implications, informing climate models on how ecosystems rebound from extremes. For Europe, it underscores the North Sea basin's role as a biodiversity cradle, influencing modern forest genetics.
Implications for Mesolithic Human History
Doggerland's habitability ~16,000 years ago coincides with Homo sapiens' arrival in northwest Europe. Pre-Maglemosian groups around 10,300 years ago may have thrived here, explaining scarce early sites on Britain—perhaps due to richer offshore resources. As a 'fulcrum,' it facilitated cultural exchanges between continental and insular populations.
The wooded refuge offered nuts, berries, game, and shelter, buffering post-glacial stresses. Submergence forced migrations, shaping genetic and linguistic patterns in modern Europe. For instance, rapid recolonization of Britain post-flooding mirrors Doggerland's legacy.
Explore related underwater archaeology at the Lost Frontiers project site, led by Bradford and Warwick.
Rewriting Europe's Ancient Narrative
Previously, Doggerland was a post-glacial steppe; now, it's a late-glacial woodland hub. This shifts timelines: forests predate expected recolonization, North Sea closure lags models, and human potential amplifies. It challenges isolationist views of British prehistory, emphasizing continental ties.
Climate resilience shines through—microrefugia amid macro-glaciation—mirroring today's biodiversity hotspots. For paleoanthropology, it prompts renewed seabed surveys for human remains, potentially revealing Europe's earliest networked societies.
European Universities Driving Discovery
UK institutions dominate: Warwick's Life Sciences pioneered sedaDNA scale; Bradford's Vincent Gaffney directs Lost Frontiers, merging geophysics and genetics. Durham contributed core analysis, exemplifying collaborative HE excellence. Funded by UKRI and ERC, this underscores Europe's research edge in environmental genomics.
Such projects train PhDs in cutting-edge techniques, fostering careers in archaeogenetics. They also engage public via citizen science, like North Sea artifact apps, bridging academia and heritage.
Future Prospects and Ongoing Research
Next steps include deeper cores for human aDNA and 3D modeling via LiDAR. Climate analogs warn of sea-level threats to modern coasts. Warwick plans expanded sampling; Bradford eyes VR reconstructions for education.
This discovery invigorates Mesolithic studies, urging EU funding for submerged heritage. As Allaby states: 'Doggerland’s wooded environment could have supported early Mesolithic communities prior to flooding.' It invites reevaluation of Europe's deep past, blending science and story.
