Ernholmsberget

Finland's prehistoric stone monuments are cairns and boulder enclosures, built by hunter-gatherers and early farmers on ridges that once looked out over the sea. The best-preserved cairn field is Sammallahdenmäki, near Rauma, a UNESCO World Heritage Site since 1999. Thirty-three granite cairns lie in clusters along a long ridge, built from boulders quarried from the cliff below or gathered on the spot. They date from about 1500 to 500 BCE; twenty-eight are early Bronze Age and the rest early Iron Age. Two are unusual: the Huilun pitkä raunio, the "long ruin of Huilu", is ringed by an ancient stone wall, and Kirkonlaattia, "Church Floor", is a rectangular cairn. Many cairns have not been dug, and dating then relies on their shape and on excavated neighbours. Further down this page, About this kind of monument gives the whole of “Finnish Bronze Age cairns and giant's churches”.

The Atlas shows 2000 BCE to 500 BCE for this site, but that is a regional estimate for this kind of monument, not a date for this particular megalithic mound. No excavation, radiocarbon sample or other measurement is recorded for it, so the real age could fall anywhere within the range, or outside it.

The range rests on this regional background (source: the Wikipedia article “Nordic Bronze Age”): Finnish burial mounds belong to the Bronze Age of the Nordic sphere (c. 2000-500 BC); the Battle Axe culture flourished in south-west Finland c. 2800-2300 BC.