I've been for a walk in Wales today with the folks. A weird place called Minera. Apart from stopping every other minute to look at some plant specimen (Dad's a full-on botanist) we came out at this huge limestone quarry. There were small rocks for as far as the eye could see.
So in true Alan Titchmarsh style (think I'm starting to turn into him) we started to search for fossils. Dad found a couple of fossilised shells and I found some good coral. Amazing to think that it was all covered by a tropical sea.