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Unusual erosive forces?

  • 09-06-2016 10:28am
    #1
    slowburner
    Moderators, Science, Health & Environment Moderators Posts: 5,223 Mod ✭✭✭✭


    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'.

    JLluzV6l.jpg


Comments

  • #2
    Fathom
    Moderators, Category Moderators, Science, Health & Environment Moderators Posts: 9,338 CMod ✭✭✭✭Fathom


    Wild guess. Small rounded depressions. Rain pits. Rain drips on exposed sediment surface. When sediment newly forming. Drying flood plains. 220px-Raindrop_impressions_mcr1.jpg


  • #3
    Fathom
    Moderators, Category Moderators, Science, Health & Environment Moderators Posts: 9,338 CMod ✭✭✭✭Fathom


    Raindrop marks. Sedimentary structures. Source: Physical Geology. Tulane University.


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