Towards the end of the Weichsel ice age came a period with warmer climate referred to as the Late Glacial Interstadial (c.14,670 to 12,900 years BP), when the great inland ice started to retreat.
This retreat was interrupted by a new period of cold climate – The Younger Dryas (YD) (c. 12,900 to 11,700 years BP). This period represented the last part of the Pleistocene epoch and preceded the current Holocene epoch. YD was characterized by a very cold climate, and the glaciers expanded and advanced towards what is termed the Ra-line; a terminal moraine ridge that developed along the coasts of Norway, but not as far south as Sola. The first humans probably arrived at Sola just after YD. The first neolithic tools found in Rogaland/Sola are dated between 11,000 and 9,800 years BP.