Bulletin of the Geological Society of Finland 1-2/2004 contains the following articles: A. Artimo et al., Three-dimensional geologic modeling and groundwater flow modeling of the Töllinperä aquifer in the Hitura nickel mine area, Finland – providing the framework for restoration and protection of the aquifer; A. Hakala and V.-P. Salonen, The history of airborne lead and other heavy metals as revealed from sediments of Lake Vähä-Pitkusta, SW Finland; M.D. Roberts, N.H.S. Oliver and R. Lahtinen, Geology, lithogeochemistry and paleotectonic setting of the host sequence to the Kangasjärvi Zn-Cu deposit, central Finland: Implications for volcanogenic massive sulphide exploration in the Vihanti–Pyhäsalmi district; C. Ehlers, T. Skiöld and M. Vaasjoki, Timing of Svecofennian crustal growth and collisional tectonics in Åland, SW Finland; R.W.R. Rutland, I.S. Williams and K. Korsman, Pre-1.91 Ga deformation and metamorphism in the Palaeoproterozoic Vammala Migmatite Belt, southern Finland, and implications for Svecofennian tectonics; K. Laajoki and A. Wanke, On the age and stratigraphic position of the Niskavaara Formation, Posio, North Finland.