A tree that lived 337 years was found under a retreating glacier in the Swiss Alps.
Picture source: By Ximonic (Simo Räsänen) – Own work, CC BY-SA 3.0, Wikimedia
Because the tree stump was in good condition it had to have lived close to where it was found. If it had been moved a long distance by the glacier it would have been turned into sawdust and toothpicks.
For a long enough time for a 337 year old tree to grow it was warmer than it is now. We know that sea levels have been rising for the last 20,000 years or longer. When it was warmer 10,900 years ago, the seas were not as high as today.
Trees have been found under glaciers elsewhere.
For stumps to be preserved in good condition they had to be covered by glaciers and remain near where they grow.