During our this year's geological fieldcourse on Öland we had a lively discussion on the origin of the shape of the Ordovician limestone layer at Ottenby cliff near the southern edge of the island (see attached photo). It seems to be a carbonate rich layer between glaukonite-rich siltstone and therefore I suspect that the boudinage-shaped layer is the result of some soft-sediment deformation. However, my interpretation is pure speculation based on a very limited knowledge in carbonate sedimentolgy. A colleague of mine, more familiar with the geology of Sweden, insists that the carbonate bodies are concretations that have formed around carbonate shells. Before returning to the site for next year's excursion I would really like to find a sound interpretation of the outcrop, which is otherwise a good one for teaching students! Any ideas?

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