Archaeological findings show people settled in the middle alpine region, later to be called Tyrol, when the glaciers retreated and flora and fauna revived, after the last ice age ended around 12,000 BC. Artifacts found on the Seiser Alm date to the Upper Paleolithic era. In the valley bottoms near Bolzano, Brixen and Salorno, mesolithic hunters resting places were discovered. Stone artefacts recovered there were dated to the 8th millennia BC. Discovery of Ötzi on the Similaun glacier in 1991 proved man had already crossed the highest Alpine passes 5000 years ago. Sedentary settlements of farmers and herders can be traced back to 5000 BC. There is ample evidence of settlements in the main and side valleys during the early and middle Bronze Age (1800-1300 BC). Preferred settlement sites were sunny terraces on the valleys slopes, and hill tops in the middle heights.