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  1. estriz

    Fresh and Altered Clay

    The driller's log is a potable water well in the Lebo Member of the Ft Union formation in the Powder River Basin in Wyoming. It is an alluvial sandstone/siltstone deposit with coal seams. These descriptions are within the first 300 ft bgs. Thanks.
  2. estriz

    Fresh and Altered Clay

    I am looking at some driller's logs from old (70s) well completion reports. They desrcibe layers of altered clay and also layers of fresh clay. Can someone explain what those descriptions mean?

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