 The peat was found to contain a barbed antler point, possibly used as a harpoon or fish spear, long, which dated from between 4000 and 10,000 BC when the area was tundra.Interest was reinvigorated in the 1990s by Bryony Coles, who named the area "Doggerland" ("after the great banks in the southern North Sea") and produced speculative maps of the area.Although she recognised that the current relief of the southern North Sea seabed is not a sound guide to the topography of Doggerland, this topography has more recently begun to be reconstructed more authoritatively using seismic survey data obtained from oil exploration.