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Cailleux Roundness Index

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    Does anyone have a picture of the sort of chart thing I would have used to place the pebbles against when measuring them to calculate thier roundness?
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    it was actually krumbein who did the roundness chart and power did sand grain.
    I did a piece of work on it in my first year and the book Geomorpholgical Techniques was a good help in not only giving method but spotting flaws in that method as well.
    “Krumbein (1941) supplied a roundness chart for pebbles, while Power’s chart is supposed to apply to sand grains only”

    The chart is the first thing that comes up when you search for Krumbein on google image search.
    Hope that it is useful

    Source: Geomorpholgical Techniques 2nd Edition, Andrew Goudie et al, Routledge, Visual comparison (
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    I know this thread is almost 3 years old but I am also looking for Cailleux' and Power's charts. Any help would be greatly appreciated as there seems to be a lack of information about them on Google.

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    oh great thread! need this for my unit 2 geography paper in 2 hours!


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