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A ground-penetrating radar (GPR) survey was carried out in order to characterize reflection patterns at Paluküla Hill, at the NE portion of the rim of the 4-km-diameter, Upper Ordovician Kärdla impact crater. The results allow us to distinguish between the Quaternary overburden and layered postimpact marine sedimentary rocks that cover the crystalline rim. The bedrock is indicated by reflections parallel to bedding that are tilted inward and outward with respect to the crater along the inner and outer rim slope, respectively. It is obvious that the uppermost part of the Paluküla crystalline rim was eroded and leveled in the Late...

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