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- Isaksson, Sven, 1966-, et al.
(författare)
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Arkeologiska undersökningar av Birkas försvunna stadsvall, fornlämning L2017:1568, Raä 119:1, Svarta jorden, Björkö, Adelsö sn, Ekerö kn, Uppland, maj 2018 och maj 2019
- 2020
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This is a report of archaeological investigations, excavations and geochemical propections, in search for the today lost part of the town rampart of the Viking Age site Birka in eastern central Sweden, conducted by the Archaeological Research Laboratory, Stockholm University, in 2018-2019. The results show, for the first time ever, evidence of a town rampart with an associated defensive ditch in the investigated portion of the town perimeter. This is inferred to be the result of deliberate choices to build different types of defensive structures with regard to the varying terrain in different sections around Birka, indicating explicit tactical considerations when choosing construction technology.
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- Isaksson, Sven, 1966-, et al.
(författare)
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Birkas norra hamnområden : Arkeologiska undersökningar av maritim lämning inom Gravfält L2017:1904, Birka, Björkö, Adelsö sn, Up., maj 2022
- 2024
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This report presents the results of archaeological investigations of maritime remains on the northern part of Björkö in Lake Mälaren, in connection with L2017:1904, Adelsö parish, in Uppland. The investigations included surveys, geochemical analyses and excavations as well as a topographic investigation of the so-called Salviksgropen. The results of a ground penetrating radar survey and an osteoarchaeological analysis of the bone material from the 2020-2021 excavations of a shipyard site are also discussed. The investigations were carried out by the Archaeological Research Laboratory, Department of Archaeology and Classical studies at Stockholm University. The results show that the stone row, which in the previous survey was referred to as the possible remains of a jetty or boat landing site, probably constituted a breakwater, as well as a landing site, that was constructed to protect the adjacent shipyard site. The osteological analysis shows that the bone material consists of food remains, and a possible place for food preparation is indicated by the soil chemical analyses. The same analysis also points to a possible site for blacksmithing activities associated with the shipyard site. The georadar survey shows traces of ploughed-over burial mounds, indicating that the cemetery Hemlanden surrounded the shipyard site on all sides. The height mapping of the potential harbour arms at Salviksgropen shows that these, as they look today, are too low in the landscape in relation to the maritime remains at Korshamn to have had this function.
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- Isaksson, Sven, 1966-, et al.
(författare)
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En vikingatida varvsplats vid Kugghamn, Birka : Arkeologiska undersökningar av L2022:2719, Birka, Björkö,Adelsö socken, Uppland, augusti 2020 och 2021
- 2022
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- A Viking Age shipyard at Kugghamn, Birka.This is a report of an archaeological investigation of maritime remains close to and connected to the Viking Age town of Birka on Björkö, Uppland, Sweden. The investigations included surveys using GNSS receivers and drones, geochemical mapping, and the excavation of four trenches, carried out in August 2020 and August 2021. The investigations were carried out by the Archaeological Research Laboratory (AFL), Department of Archaeology and Classical Studies, Stockholm University. The results show that there was an extensive maritime cultural landscape on the northern part of Björkö, which is rich in remains of different character. One of these remains was investigated in detail by the excavation of four trenches. The feature consists of a dug-out hollow, lined with stones at sides and bottom. Evidence of a wooden contraction was found in the bottom of the hollow in the form of small post-holes, and a stone-frame at the mouth of the hollow towards the waterfront. This is interpreted as the remains of a boat slipway. Rivets, both used and unused, tools for carpentry, and slate whetstones, dominate among the finds and mirror the activities of the site. All is interpreted as evidence for a boat repair site with an associated boat slipway. Finds of e.g. glass beads contemporary with the town Birka, provides a general dating of the remains, possibly with an emphasis towards its later phases of the town. This maritime construction is a unique find with few parallels, but fits well with the other maritime remains in the area. In order to understand its function and dating, it is vital to continue investigations in this important area of Björkö.
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