Britain’s post-glacial landscapes revealed through new geological evidence

New geological investigations are reshaping the understanding of Britain’s post-glacial hydrological landscapes. Research involving LiDAR, radiocarbon dating, and sedimentary studies suggests that instead of viewing individual rivers, peat beds, and flood deposits as isolated sites, they should be studied as integrated, large-scale water systems.

In Cardigan Bay, evidence from the Llanon sequence reveals substantial alluvial gravels and cobbles, prompting questions regarding the duration and scale of these ancient water systems. Similarly, in Glen Roy, the famous ‘parallel roads’—three level terraces etched into a Highland valley—serve as a record of ice-dammed lakes. These features mark former shorelines that demonstrate how shifting spillways and sudden drainage shaped the landscape at the end of the last Ice Age.