Prolific decades of marine geology at the Geological Survey of Finland: a historical review

The article presents a short historical review of development of marine geology at the Geological Survey of Finland (GTK). The founder of the marine geology unit at GTK, Dr. Heikki Ignatius, established at an early stage good relations with the Baltic Sea researchers of neighbouring countries. This resulted in joint research cruises, exchange of ideas and close cooperation. The purpose of this article is to highlight some of the important steps taken at GTK and to show how cooperation has resulted in the investigations of the Baltic Sea becoming one of the best studied sea areas in the World Ocean.