The dumped material is represented in the cores by the gravelly mud lithofacies with massive texture and angular coarse particles. The short gravity cores were studied for lithology, and in 1-cm slices for 137Cs activity, organic content, and grain size distribution. The areas covered by dumped dredge spoil stand out in the multibeam images because of their irregular surface and elevated backscatter. Full coverage multibeam bathymetry and relative backscatter data, and a number of sediment cores were collected over the sites. This paper presents a study of Vuosaari and Uusikaupunki-D offshore dumping sites in Finland, the northern Baltic Sea. The development of indicators for determining seafloor integrity and its possible disturbance by human activities have so far largely ignored the geological properties of seafloor. The European Marine Strategy Framework Directive requires the development of suitable indicators for regular reporting on the environmental state and achievement of a good environmental status of EU's marine waters by 2020. 2Marine Research Center, Finnish Environment Institute (SYKE), Helsinki, Finland.1Marine Geology, Geological Survey of Finland (GTK), Espoo, Finland.
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