Thought I'd share this -- it's a very beautiful map made from LANDSAT imagery -- published by the Geological Survey. It's effective because of low level light, dense shadows and false-colour adjustments, which show up uplands as green, full forest or well-wooded areas as dark red, urban areas as grey, and orange for everything else.
The distribution of uplands is particularly impressive. Click to enlarge. There is extraordinarily fine definition. If you imagine the Welsh Ice Cap sitting over these uplands, with an axis running more or less N-S, you can see how and why the Irish Sea Glacier was unable (for most of the time) to penetrate into the west-facing coasts of Cardigan Bay and was pushed southwards, where it flowed NW-SE across the Pembrokeshire peninsula and up the Bristol Channel, driven by ice from the west, in Southern Ireland. It all makes good sense......
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