Abstract
In connection with current investigations of the distribution of Palaeozoic rocks at the floor of the Baltic, Nielsen's Grund (halfway between Visby on Gotland and Nynäshamn on the Swedish mainland) and the Hoburg Bank (SE of Hoburg on Gotland) have been surveyed. Nielsen's Grund is a very local shoal just in front of the submarine Ordovician scarp, projecting from depths of about 150 m and reaching 15.2 m below sea-level. It is entirely covered with glacial deposits, partly consisting of varved clay and silt. The Hoburg Bank is a longish feature along the strike of the Silurian beds and scarps of Gotland. At all localities sampled by diving it proved to be covered with sand and coarser glacial deposits, but boulder studies indicate that calcareous equivalents of the Öved-Ramsåsa Beds of Scania are to be found along its NW parts, and the Beyrichienkalk, found in drift south of the Baltic, occurs in its higher parts.

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