On the rocks at CB 1

Erosion patterns on sedimentary rocks

On the rocks at CB1 – Pattern and texture on the surface of Carboniferous Limestone rocks at Caswell Bay in Gower, South Wales

4 Replies to “On the rocks at CB 1”

  1. A few quick questions…

    Are the breaks?
    fault?
    joints?
    fractures?
    cracks?
    combination of above

    is there a preferred orientation to the breaks or are they randomly orientated or a combination of both?

    are the features open or are they infilled?

    are they associated with a particular lithology?

    are there any associated karstification features?

    do similar features occur in beds above and below?

    what is the timing of formation?

    how do you think they were formed?

  2. That’s quite a lot of questions, Rob. I am not certain I know all the answers. I will do a bit of homework and get back to you. Do you know the answers yourself? Help appreciated.

  3. Thanks for your reply Jessica.
    I know some of the answers, but am off to stay in the Mumbles, in the next few day, and will, hopefully, have time to wander down to Caswell to answer the rest myself.
    Can you give me an idea of the precise location?
    I will get back to you on this!

    A few quick questions…

    Are the breaks?
    fault?
    joints?
    fractures?
    cracks?
    combination of above

    is there a preferred orientation to the breaks or are they randomly orientated or a combination of both?

    are the features open or are they infilled?

    are they associated with a particular lithology?

    are there any associated karstification features?

    do similar features occur in beds above and below?

    what is the timing of formation?

    how do you think they were formed?

  4. Rob, I have updated the post to show the location where I took the picture. Have a look at the post again and see what you think. I am guessing the breaks are fractures and they go down through the rock layer. There is a pattern to the breaks on the surface of the bedding plane which is roughly geometrical but I am uncertain whether the breaks show an orientation. I thought at first that it was High Tor limestone but it is a place where several rock types lie close together, There are many faults crossing Caswell Bay and I wonder if one of those might be responsible for the fracturing of these rocks, which subsequent to exposure have begun to show signs of karstification.

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