laptoppop
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- May 19, 2006
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Please look at the research a little bit more closely. What you'll find is that the sorting was duplicated in both dry conditions and using hydrodeposition. The thing that is especially interesting is that they laminations that are observed match those of the original strata.Their examples seem to rely on particles sorting themselves by sliding down a slope, either of a sand pile or the sides of a dropping funnel.
The article points to layering in the pyroclastic flow from Mt St Helens, but we are talking about a flood not aerial deposition and clay particles not ash.
What physical constraints resulted in the layering of vast beds of shale? There are no sloping walls. The clay particles aren't rolling over each other like the ones in the funnel or in pyroclastic flows, the particles are surrounded and isolated from each other by water until they reach the bottom.
What slowed the clay bearing water down enough for the clay particles to settle out? What force were able to produce changes in direction of water flow or composition of the sediment suspension across vast areas to give layering, yet with these forces not disturbing the very calm conditions needed for particles smaller than 0.006mm to settle out?
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