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Olza Wall. The biggest [30 m high] outcrop of oligocene menilite shale [source rock of oil] in Polish Carpathians. Menilite shale contains brown opal derived from the organic silica of diatoms. Folds related to Carpathian overhursting can be observed in the outcrop. Upstream the Wislok river, recent travrtines can be observed in the left 10 m high bank.…
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Date of experience: May 2019
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