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Subglacial Soft Sed Def (Why do soft beds occur? (Soft beds = more likely…
Subglacial Soft Sed Def
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Why do soft beds occur?
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Yet, also need to deliver sed to bed
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Soft bed thickness
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Evidence
Subglacial penetrometers
- hot water drill through glacier
- drive heavy metal stake into underlying till
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Subglacial water flow
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↑ Water input, ↑ Dilation ∴ Material shears/deforms
Bed def requires
- Sediment saturated w water
- Water @ high pressure
i.e. pressure close to overburden
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