In reply to annasmilesaway:
Which area do you want to know about?
The classic coffee-table book on the UK's geology is Granite and Grit by Ronald Turnbull. It's quite a read - the geology of the UK is ridiculously complex and it makes a good stab at simplifying it.
Or there's the new The Alps - a Natural Companion by Jim Langley and Paul Gannon. It's a three part book; the first two sections look at the geology and flora of the Alps, and the third part is a guide to 20 walks in the Alps picked to showcased the earlier topics.
Both are perhaps slanted towards walkers than climbers but I don't think that makes much difference.