In reply to The Ivanator:
I think you are being a bit naive. There are not that many different rock types in this country and the title of the guidebook is often a give away. As climbers we are not necessarily geologists and with that in mind this is the rock formations I understand them:
If it is yellow and hard it is granite.
If it is brown or black, rough and rounded it is gritstone.
If it is brown or black, rough and rounded but comes off in your hand, it is sandstone.
If it is white and really hard to climb it is limestone.
If you are in the mountains it is mountain rock.
It it is smooth with no holds or gear it is slate.
If it is a choss pit, you are in Lancashire.
If there is more vegetation than rock, you are probably in the Midlands somewhere and desperate for any sort of climbing action.
I hope that clears things up for you.
Post edited at 14:57