History Drought in Ireland Reveals Ancient Henge

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The discussion highlights the phenomenon where decayed post bases create visible soil patterns from the air due to their resistance to desiccation compared to surrounding soil. Participants express curiosity about the role of lignins in this process and inquire about the cultivation history of the area. There is also interest in whether soil accumulation rates have been measured, emphasizing the long-lasting impact of these post bases on the soil's appearance, described as a persistent form of "deep" scarring or marking.
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The holes in the ground that once held the bases of posts decayed away and left soil there more resistant to desiccation that the surrounding soil, making their location visible from the air.
Picture and little article here.
 
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Lignins? What's the cultivation history? Have there been any soil accumulation rates measured? That's an impressively persistent "deep" scarring/marking/tattooing of the soil.
 
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