most probably the rate at which its shrinking/drying, and possibly the thickness of the layer
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Thanks for the suggestions! So does rapid shrinking give larger spacing? I guess some of the bigger polygonal crack networks I can think of are on lava lakes: relatively rapid cooling, and thin crust. (Tho maybe a poor analogy...?).
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Desiccation?
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Yeah, I wondered that at first but can't get my head around the scale...
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These are remnant ice wedge polygons, periglacial features from a colder time. As the ice lenses at the margins melted loess blew in, and they have different props/drainage than the surrounding soil. Can be seen in xsection as well.
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Ace! Looking through the examples in the literature, it definitely looks like this is it.
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Might be worth having a trawl through this report, as it's very indepth on the local geology and history of Easton on the Hill: http://www.rnrpenvironmentalcharacter.org.uk/data/4.1%20CLCA.pdf …
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Thanks! Good stuff: Will take a look.
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Quite possibly periglacial in origin, some form of polygonal cyroturbation that altered the bedrock/superficial deposits.
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Agree, remnants of periglacial features, dating from the LGM/Younger Dryas. Look at this example from France: https://journals.openedition.org/quaternaire/7717?lang=en … Also very common to be found in Belgiumpic.twitter.com/gBMsKzLxzr
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