GaryN wrote:Moses,
If the land form was soft, the dunes of starbiters model perhaps, then I would expect to see, with large water flows, the smooth curves that we see in water flowing through such material, and a much 'softer' appearance to the land form. Looking at google maps, I don't see that. You don't like the electric/plasma catastrophe model I take it?
The experiments demonstrate that in still water, continuous deposition of heterogranular sediments gives rise to laminae, which disappear progressively as the height of the fall of particles into water (and apparently their size) increases. Laminae follow the slope of the upper part of the deposit. In running water, many closely related superposed types of lamination appear in the deposit (Berthault, 1988 - French Academy of Sciences).
webolife wrote:I do a downscaled version of Berthault's flumes at home with a sandscape frame. The laminae are tighter and closer when the flow rate/current is more gradual and deeper/thicker when the flow is greater. By flow I mean the number of particles per time, not speed of particles, which is greater for the larger particles and less for the smaller, regardless of how many particles are falling. This is what gives rise to the different styles of laminae. When different current "sizes" [turbidities] are mixed the laminae become indistinct, and when the flow rate is fairly constant the laminae are distinct and their thickness is determined by the amount of particles being carried.
Bethault also showed soem distinct behaviors in lamination when forming over a mound versus forming in a depression, very interesting stuff, and definitely not part of typical standard geological explanations, whether or not they are familiar with his work...
Anyone know where this is from, none of the images I've seen mention the location
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