Channel - polygons

Channel landscape features subdivided where possible into open tunnel valley, open fluvial channel, open tidal channel, tidal inlet, buried fluvial channel, buried tunnel valley, or buried tidal channel. Chronological information is presented as calendar age 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.