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407 Views 6 Replies Last post: Oct 28, 2013 9:51 PM by MikeHardman RSS
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Oct 28, 2013 5:22 PM

why so many pebbles ?

i live in wigan, lancashire  and i vistited my local bulding site in highfield to see if any fossil or rocks have been churned up because that day it had been raining hard and the water was draining into the brook in the valley next to the site i noticed alot of coal was churned up but then i saw some pebbles and im wondering is this gravel from a river or something else i have added the photo below

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    Oct 28, 2013 6:59 PM (in response to tjharte)
    Re: why so many pebbles ?

    Hmmm...

    I see pebbles and not much else; perhaps a little patterning like sometimes occurs with solifluction

    but that may be just coincidental. I can't tell if the pebbles are recently deposited or whether they have been exposed by erosion (having been concealed in the soil previously).

     

    Mike

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        Oct 28, 2013 8:52 PM (in response to tjharte)
        Re: why so many pebbles ?

        Hi tjharte

        Sounds like there is some coal near the surface of the building site but your image could be a mix of concrete that has been discarded by the builders.

        Often used for foundations and placed in shuttering with steel mesh spread out across the area to add strength.

         

        Tabfish

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        Oct 28, 2013 9:14 PM (in response to tjharte)
        Re: why so many pebbles ?

        By all means post the other pictures.

         

        And if I may trouble you, please could you explain again what happened where and in what order; I'm not clear about that from your original text.

         

        Mike

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            Oct 28, 2013 9:51 PM (in response to tjharte)
            Re: why so many pebbles ?

            It sounds as though the brook may have overflowed for a while, and if it was flowing swiftly enough, it could have taken pebbles with it and deposited them where you saw them. Or perhaps there was a heavy storm and the water was flowing over the ground in various places until it found a part it could cut into, forming the brook, and leaving the pebbles nearby. But that is just speculation. As it is, I don't think you have enough information to say when the brook came into existence.

             

            To get a reliable answer, you'd need to look at maps and satellite photos, see how the brook fitted into the larger scheme of drainage, research the agricultural and industrial history of the area, talk to locals, etc.

             

            However, it was good to ask the question; that shows curiosity.

             

            Mike

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