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The Official Space Thread
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<blockquote data-quote="jeepers" data-source="post: 6982375" data-attributes="member: 15917"><p>Some great sedimentary features in that photo. You can see coarser material (grit & pebbles) in the hollows between those ridges of sand. What's happening there is a combination of two similar things. The hollows are partially sheltered, therefore wind speed drops, and with it, the ability of the wind to carry heavier material, so that stuff drops out. Secondly, the wind is strong enough to move a pebble downhill, but not back uphill. These ridges would gradually move along, pushed by the wind.</p><p></p><p>Which leads me to the second feature: cross bedding in the low cliff, highlighted with the blue line, below. The normal bedding (layering) is almost flat, and highlighted in red. The cross bedding is a preservation of the front of a sand dune.</p><p></p><p>[ATTACH=full]10038[/ATTACH]</p><p></p><p></p><p><a href="https://en.m.wikipedia.org/wiki/Cross-bedding" target="_blank">Link</a> to more detailed explanation of cross bedding.</p></blockquote><p></p>
[QUOTE="jeepers, post: 6982375, member: 15917"] Some great sedimentary features in that photo. You can see coarser material (grit & pebbles) in the hollows between those ridges of sand. What's happening there is a combination of two similar things. The hollows are partially sheltered, therefore wind speed drops, and with it, the ability of the wind to carry heavier material, so that stuff drops out. Secondly, the wind is strong enough to move a pebble downhill, but not back uphill. These ridges would gradually move along, pushed by the wind. Which leads me to the second feature: cross bedding in the low cliff, highlighted with the blue line, below. The normal bedding (layering) is almost flat, and highlighted in red. The cross bedding is a preservation of the front of a sand dune. [ATTACH type="full" alt="20220126_071023.jpg"]10038[/ATTACH] [URL='https://en.m.wikipedia.org/wiki/Cross-bedding']Link[/URL] to more detailed explanation of cross bedding. [/QUOTE]
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