The rocks in Gerumsberget are the same as in the other table mountains (basement, sandstone, alum shale, limestone, clay shale, and dolerite), but the mountain is part of the same limestone plateau as Varvsberget and Plantaberget. The actual visible mountain thus consists only of clay shale and dolerite. The name Gerumsberget is very old, found in written sources dating back to the 14th century. The mountain is situated between the municipalities of Falköping and Tidaholm, and reaches a height of 326 metres above sea level.
Several archaeological finds have been discovered in a bog (Hjortamossen) atop the mountain, including a wool cloak, an oar, and a fishing net.