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Thread: geography/geology question

  1. #1
    Widdler david pickard 2's Avatar
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    I recently took a walk from the usk reservoir and around to the memorial site.On the top there were "mushroom" like raised mounds of earth,can anyone tell me what there called and what causes em?I was thinking something to do with the water table maybe???Souldve paid more attention at school;-)

  2. #2
    Initiate SteveD's Avatar
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    Could be frost forcing up soil. A similar effect is seen in regions that have permafrost, it results in stone circles IIRC, and can bring skeletons up to the surface.

    Steve D

  3. #3
    Widdler david pickard 2's Avatar
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    Thats good enough for me Steve,unless of course Emmett Brown comes along with another explanation.

  4. #4
    Mini Goon Fleegle's Avatar
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    Did you get any photos?

    Looking at satellite images, they could be one of two things, both man made.

    They could be burial mounds, being onhigh ground, a very likely possibility, or, something to do with the reservoir.

    A quick search on Google, did list some burial moundsin that area.

  5. #5
    Widdler david pickard 2's Avatar
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    I have got some pics but im at work atm.Fleegle,they were miles from the reservoir and far too random to be manmade imo.By all accounts the top of Waun Fach is normally pretty boggy but was frozen on this occasion,which makes me think SD could be on the right track.

  6. #6
    Mini Goon Fleegle's Avatar
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    I'm no expert, but looking at Google maps, there are some interesting formations around there.

    But no mention of forts or tumuli on the online OSmaps.

  7. #7
    Initiate woozle's Avatar
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    "On the top there were "mushroom" like raised mounds of earth"

    How big were they?

  8. #8
    Ultra King Mikel el Bastardo's Avatar
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    I don't know the area, but peat hags can form into some pretty weird shapes.

  9. #9
    Widdler david pickard 2's Avatar
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    Ive managed to upload some pics to my gallery.

  10. #10
    Mini Goon Fleegle's Avatar
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    Its not easy to tell from such small sized images, but my initial thoughts are water erosion of softer groundfor the first two.

    Which would back up Mike fae Dundee's theory.

    If you click HERE, this image, was taken on Waun Fach, classic case of peat erosion.

  11. #11
    Ultra King
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    They just look like peat hags to me. Mike is right.

  12. #12
    Widdler david pickard 2's Avatar
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    Yeah sorry about the sizing,first attempt at uploading.What software does everyone use to crop and reduce the mb?
    So peat hags caused by water erosion is the answer then.Thanks guys.

  13. #13
    Mini Goon Fleegle's Avatar
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    No worries, we've all got to start somewhere.

    There are many different programs for re-sizing, some free, some come with Windows or Microsoft Officeand others, of which there are many, you can purchase.

    Because its no extra cost, I useMicrosoft OfficePicture Manager, which comes with Microsoft Office.

  14. #14
    Widdler
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    Could be frost forcing up soil. A similar effect is seen in regions that have permafrost, it results in stone circles IIRC, and can bring skeletons up to the surface

    Pingo!

  15. #15
    Mini Goon
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    They look like the edges of old peat hags to me too.

  16. #16
    Ultra King Paddy Dillon's Avatar
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    Well... I suppose peat hags could look a bit odd to someone who's never seen them before. I spent my formative years floudering around among them, the length and breadth of the Pennines, so they'e just part of the scenery for me.

  17. #17
    Ultra King alexander rae's Avatar
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    DP2, above is photos of peat and its natural erosion( in the Scottish Highlands)Hope this helps, it can look as it has been caused by water erosion but there may be little water around .

  18. #18
    Ultra King Paddy Dillon's Avatar
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    You don't need water to kick off the decay of blanket bogs. All you need is for the vegetation on top to start giving up the ghost, and the spongy layers of peat underneath don't stand a chance. Overgrazing... over-walking... one moorland fire too many... or anything that damages the vegetation... and the rot kicks in. Soft peat is easily washed away even by thin trickles of water, and in dry conditions it crumbles and blows away in the wind. You have to keep the stuff soaking wet, and well-vegetated, for it to stay put.

  19. #19
    Ultra King alexander rae's Avatar
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    Its not a thing I know much about paddy, there is quiet a bit of it above where i dig my peat,on my next visit i'll take a few photos, it just seems to be falling away in big slices all by itself although it damp in parts.

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