An excavation in the waterfront Bjørvika neighborhood of Oslo has unearthed the remains of a long section of a wharf believed to have been built by a medieval king of Norway. More than 26 feet of the foundations of the pier have survived in excellent condition under the thick clay of the Oslofjord seabed.
The wharf foundation was built by interlacing massive logs into bulwarks that were then embedded into the seabed. Impressions of barnacles and mussels on the logs indicate they were left exposed in the water. The structures built on top of the foundations over time pressed them deeper into the clay where they were preserved even when the surface structures were lost.
A small mystery is that inside the bulwark there are several layers of dung, food waste, fish bones and sodden peat.
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