Examples of Clay-Silt Layers
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Green River Shales (WY, UT, CO)
Several million pairs (up to 20 million)
Covers over 10,000 square miles
Thickness varies with frequency of sunspot cycle and
procession of equinoxes.
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Haymond Formation (TX)
15,000 sandstone/shale pairs
Large area, almost a mile thick
How does one get silt to settle quickly?