Photo 30. Another close up view of the internal structure of dune-bedded sandstones near Ruthin, north-east Wales. A variety of cross-cutting erosive surfaces can be clearly seen in this image (picked out by the lines of holes). These represent several super-imposed sand dune sequences as the wind direction changed over time, producing localised erosion of some sand dunes, and then later re-deposition of new sand layers.
Photo 30. Another close up view of the internal structure of dune-bedded sandstones near Ruthin, north-east Wales. A variety of cross-cutting erosive surfaces can be clearly seen in this image (picked out by the lines of holes). These represent several super-imposed sand dune sequences as the wind direction changed over time, producing localised erosion of some sand dunes, and then later re-deposition of new sand layers.