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Unusual erosive forces?

  • #1
    Moderators, Science, Health & Environment Moderators Posts: 5,193 mod slowburner

    This stone exhibits signs of quite unusual (?) erosive processes, believed to be formed by freeze/thaw action. This type of fracturing is commonly known in the UK as 'pot lids'.
    Can anyone offer a description of how exactly these processes operate, and how they came to form this pattern? Not too sure of the precise petrology, but it is probably a fine grained sandstone. The original colour can be seen in the uppermost central 'pot lid'.