Between rocky outcrops and promontories at Ferriters Cove lie stretches of sandy beach with patches of water-worn beach stones and smaller pebbles. The stones are derived from a variety of Silurian strata, not only from this cove but also from the coast further to the north which is also composed of Silurian Period rocks.
Jessica's Nature Blog 
Lovely colours there Jessica, polished and shaped by the sea.
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I’d like to be able to identify the exact nature and origin of every pebble I see but I have to content myself with photographing as many as possible and try to find out about them later. Not an easy task. Not many really useful books but one I have come across is helpful in a general way and full of lovely pebble and beach stone images (captured on a scanner apparently):
Beach Stones, photographs by Josie Iselin and text by Margaret W. Carruthers, published 2006 by Harry N. Abrams, New York, ISBN978-0-8109-5533-2.
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Looks intriguing Jessica. Will have to check that out.
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