Last Glacial Maximum (LGM) landscape / base of the post-LGM deposit. Contours are presented as depth (metres) below present mean sea level of the post LGM sedimentary cover. This is an erosional unconformity, where an infilled valley is present the valley base has been used. LGM defined on average at 18,000 years BP. Confidence is defined as follows: 1. High: Sampled feature with good age and palaeoenvironmental control. 2. Sampled feature with poor or none age and palaeoenvironmental control. 3. Constructed by remote sensing data only, 4. Low: Reasonable without any direct evidence