The problem of reliable dissection of the Quaternary sediments of the north-western part of European Russia is now particularly acute in connection with the geological survey on a scale of 1:50,000 and the search for minerals necessary for the national economy.

The problem of reliable dissection of Quaternary sediments in the north-west of the European territory of the USSR has become particularly acute in connection with the search for construction raw materials and the expansion of reclamation works .....