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Riverbed sandstone, with diagonal 'cross-bedding' half way up: an active sandbank, with its top carved off by a later movement of the stream. Old Red Sandstone on Craig y Fan Ddu, Brecon Beacons. |  |
Current page: 4
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Riverbed sandstone, with diagonal 'cross-bedding' half way up: an active sandbank, with its top carved off by a later movement of the stream. Old Red Sandstone on Craig y Fan Ddu, Brecon Beacons. | |
Current page: 4