The geological structure, history of development and paleogeography of
the Northern Baltic are considerad by the example of the detailed stu
dy area AMK-22-V. The clints and deep valleys were examined from subme
rsibles ''Mir''. The bottom topography of the study area and Quaternar
y deposits were studied with Parasound echosounder. The samples of Ord
ovician rocks and Quaternary deposits were examined and described.