While the reliability of these stories remains disputed, dendrochronological examinations of logs driven into the seabed in Norrström, square oak logs, and sunken logs found on Helgeandsholmen just north of Stadsholmen in 1978-1980, concluded these trees were cut down during the period 970-1020, most of them from around 1010, and these logs presumably gave the entire city its present name, Stock-holm, "Log-Islet".
