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2 Polish Geological Institute Special Papers

2 2004

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The Holocene sea level rise in the Southern Baltic as reflected in coastal peat sequences

Lampe R., Janke W.

Polish Geological Institute Special Papers

2004

Vol. 11

19-29

Coastal peatlands depend in respect to their vertical growth totally on the sea level, are witnesses of its variations and, furthermore, preserve remnants of organisms which permit conclusions about the nutrient content and salinity of the flood water and thus of the surrounding sea. Black layers which occur frequently in the peat profiles point to evolution phases whereas the sea level fell or the mire became desiccated. Around thirty radiocarbon data, data from pollen and diatom analyses as well as from geochemical investigations provide the base to reconstruct the sea level history. The placement of particular transgression/regression stages could be determined with a higher accuracy than before and demonstrate a strong correlation to climate oscillations such as to the Late Bronze Age dry period or the Little Ice Age climate deterioration. Uncertainties still remain in regard to the regression magnitudes and to the length of the hiatuses in the peat sequences.

Changes to the coastline in the neighbourhood of the Medieval harbour in Puck, in the light of the research made by the Polish Maritime Museum in Gdańsk

Pomian I.

Polish Geological Institute Special Papers

2004

Vol. 11

31-36

The site was discovered in 1977 by amateur scuba divers. During preliminary excavation in the Puck Lagoon, a massive system of timber structures, fascine, and stone as well as earthen embankments scattered over an area of over 12 hectares, were found. Looking at the chronological arrangement of the site, slowly reconstructed on the basis of dendrochronological analyses and supplemented with radiological research, it should be assumed that the northern strip of the construction is a continuation of the quay strengthening construction, the root of a harbour pier. It is probably the earliest stage of the Puck harbour development. Taking both the layout of the construction, working as defences of the swampy alluvial estuary of the Płutnica river, parallel to the present coastline, as well as chronological layout of the stand, which gets younger and younger the closer it gets to the present shore line, it may be assumed that the changes in the location of the port construction were influenced by quite quick deepening of the basin and movement to the south of the medieval shore line.