article_snippet: The agate tool was uncovered under a thick layer of volcanic ash dating back to the eruption of Mount St Helens 15,800 years ago.
article_snippet: The agate tool was uncovered under a thick layer of volcanic ash dating back to the eruption of Mount St Helens 15,800 years ago the eruption of Mount St Helens 15,800 years ago Mount St Helens .
article_snippet: No one is going to believe this until this is shown there was no break in  that ash layer, that the artifact could not have worked the artifact way down from higher up, and until the artifact is published in a convincing way,' No one said. '
article_snippet: Thomas said Thomas noticed an outcropping of an ancient lava flow, with some very tall sage brush growing in front of an outcropping of an ancient lava flow, indicating very deep sediment deposits.
article_snippet: The soil was black in front of the rock, indicating someone regularly built cooking fires there for a long time.
article_snippet: Uncovered above and below the volcanic ash layer were fragments of teeth believed to be from ancient camels.
highlights_snippet: The agate tool was uncovered under a thick layer of volcanic ash .
  