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- Bergman, Jonas, et al.
(författare)
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When the River Began—The Formation of River Motala Ström and Human Presence in the Early Holocene, Sweden
- 2020
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Ingår i: Quaternary. - : MDPI AG. - 2571-550X. ; 3:3
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Tidskriftsartikel (refereegranskat)abstract
- In conjunction with the extensive archaeological projects conducted at the current outlet of Sweden’s second largest lake, Lake Vättern, macrofossil, pollen and diatom records have been studied from 14C-dated lake and river sediments from River Motala Ström in Motala and Lake Boren. These investigations have revealed sedimentary evidence of the Yoldia Sea regression, the Ancient Lake Vättern transgression, and the following stepwise river formation process. Around 9000 cal BC, two small kettlehole basins at Strandvägen and Kanaljorden became isolated from the Baltic basin. As the ice sheet retreated further north, the isostatic uplift isolated the Vättern basin from the Baltic basin. Due to the uneven isostatic uplift, the basin tilted toward the south, and the Ancient Lake Vättern transgression started in Motala. The threshold in Motala at 92.5 m a.s.l. was reached around 7200 cal BC, and River Motala Ström was formed. 14C-dated diatom records from Lake Boren, and shoreline deposits in Motala, confirm this event. The water level in Lake Vättern initially fell around 1.5 m, and around 5800 cal BC, a second erosional event cut down the threshold to modern day level. At this time, the Late Mesolithic settlements in Motala were established and expanded.
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- Heimdahl, Jens, et al.
(författare)
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A New Method for Urban Geoarchaeological Excavation, Example from Norrköping, Sweden
- 2005
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Ingår i: Norwegian Archaeological Review. - : Routledge. - 0029-3652 .- 1502-7678. ; 38:2, s. 102-112
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Tidskriftsartikel (refereegranskat)abstract
- Urban excavations often uncover complex stratigraphy that is difficult to interpret by archaeological experience alone. Versions of Single Context Recording can be useful tools, but this method is known to be demanding when co-employed by consulting geologists in the field. Are these difficulties caused by fundamental differences between the views of archaeologists and geologists, or are they mainly a result of lack of mutual understanding? What would happen to field methods and interpretations if a geologist worked alongside an archaeologist at an urban excavation throughout a whole excavation season? This approach was tested at a geoarchaeological excavation in the town of Norrkping, Sweden. The experiment led to the development of a new field procedure involving continuous pilot sampling and on-site analysis of plant macrofossils. It provided new ways of using natural sediments and redeposited layers in the interpretation of the sites development and clearly confirmed that mutual understanding is the key to interdisciplinary cooperation.
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