The article concentrates on a birch-bark formation at the foot of Keava hill fort, introducing the course of its archaeological excavations and various ways
of explaining its presence. In addition, the complicated way of archaeological interpretation, especially in case of rather limited background information, and the search for the “right” solution, is tackled. The author reaches the conclusion that the birch-bark deposition is most likely not a human creation after all, but a natural formation where birches growing in a kettle-basin (Verevainu Mire) that became inundated for a longer time, died and decayed on the spot.