Relative sea-level
Orkney Riddle Relative Sea Level Relative sea-level describes the change in sea level relative to the shorelines of the world's continents. Many countries with a shoreline have undertaken offshore surveys to establish a graph that relates present sealevel to those at prehistoric dates in the last 10,000 to 20,000 years. For Britain this work was carried out by a team headed by Ian Shennan. The results for their work are published as:- Relative sea-level changes and crustal movements in Britain and Ireland since the Last Glacial Maximum by Ian Shennan, Sarah L. Bradley, and Robin Edwards They introduce their results as follows:- The new sea-level database for Britain and Ireland contains >2100 data points from 86 regions and records relative sea-level (RSL) changes over the last 20 ka and across elevations ranging from ~รพ40 to -55 m. It reveals radically different patterns of RSL as we move from regions near the centre of the Celtic ice sheet at the last glacial maximum t...