Kummakivi is an erratic boulder which was glacially transported to rest on top of a rôche moutonnée. The boulder is special since only around 0.5m2 of its surface area is in contact with the rock below it. The dimensions of the boulder itself are approx. 7m x 4m x 5m. Both the rôche moutonnée and the erratic boulder are mixed granite-cordierite-mica gneiss typical for the area, and the grooves and chatter marks tell of glacial erosion. The area emerged from underneath the continental ice sheet around 11,500 years ago, when the environment around Kummakivi differed drastically from that of today: instead of nestling in the shade of the forest, the boulder was perched on the shore of an ancient ice lake.
Coordinates: x=576101,029 y=6818585,328 (ETRS-TM35FIN)
The above coordinates are working in GPS-devices and karttapaikka.fi services.
The below coordinates are working in Google maps services.
Coordinates: 61.493441385, 28.429346978 (ETRS89 maantieteelliset(~WGS84))
Image: Arto Hämäläinen