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题目材料：
Bowles et al. posit a positive relationship between Scandinavian settlement locations during the period of Viking expansion, beginning in the 8th century, and availability of bog iron at these locations. They cite Eriksson's 1961 map that plots locations of major settlements in relation to known areas where bog iron could have been extracted. Two settlements in particular, Telemark and Bergslagen, were near numerous pockets of available bog iron. The map shows a lack of settlements where evidence for bog iron deposits is lacking. Trondheim is the only settlement of a noticeable distance from any deposit. It may be that our knowledge is incomplete regarding the location of bog iron deposits at that time, or Trondheim may have been used to gather other resources.
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