another discoidal rock / grinder
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Thread: another discoidal rock / grinder

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  1. #1
    cr
    May 2005
    Drake, Costa Rica
    2,086
    3069 times

    another discoidal rock / grinder

    This is a Diquis artifact from Guerra on the Rio Sierpe in southwestern Costa Rica; borrowed for this show-and-tell. It was made by pecking and then grinding from gabbro, the same material as the stone spheres. This stone comes from the Rio Terraba (to the north), so it was imported (as was the case with the spheres).

    It is 6 to 6 1/2" in diameter, and 2 to 2 1/2" thick. The dimple depressions are on both sides, slightly off center and not aligned, and ~5/8" deep; the picking pock marks are clearly visible in the center. The sides, including rounded outer rim and central depression, are ground smooth; pecking is faintly apparent at the outermost periphery.

    An identical piece is pictured in an older book on CR archaeology, and google shows pictures of similar ones called 'grinders' - no idea how such was concluded. Many questions, no answers. (not a nutter, chunky gaming disc, etc.)

    Click image for larger version. 

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    Sorry about the images, learning.
    Bill
    T.C., Toecutter, RustyGold and 5 others like this.

  2. #2
    Charter Member
    us
    Jun 2011
    Southwest Georgia
    5,388
    5538 times
    All Types Of Treasure Hunting
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    I bet there's some really nice artifacts down in Costa Rica. I was in Honduras years ago while in the Army and all I found was a few pieces of pottery. The Army was building roads and bridges out in the middle of no where. The pottery was plain.

  3. #3
    cr
    May 2005
    Drake, Costa Rica
    2,086
    3069 times
    yea, used to be kinda wide open; today you can't stick your finger in the ground

    Bill
    GaRebel1861 likes this.

  4. #4
    cr
    May 2005
    Drake, Costa Rica
    2,086
    3069 times

    and another discoidal grinder

    another discoidal grinder based on the wear patterns, ~4" dia
    the pecking in the centers and edges is clear

    Click image for larger version. 

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    as are the beveled edges of old fractures, hence the use of the word grinder

    Click image for larger version. 

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    the previous one from a non-local stone, and this one from the adjacent river

    Click image for larger version. 

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    Toecutter likes this.

 

 

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