Sub-Cambrian peneplain

[5] In southern Sweden the peneplain surfaces tilt away from the crest of South Swedish Dome, to the northwest in Västergötland, to the northeast in Östergötland and to the east in eastern Småland.

At Stöttingfjället in northern Sweden the peneplain occur, as result of tectonic uplift, at about 650 meters giving origin to a series of water gaps including those of Ångermanälven, Indalsälven and Ljusnan.

[2][6] One exception to this is the island Blå Jungfrun in the Baltic Sea which is an ancient inselberg formed in Precambrian time and buried in sandstone after its formation.

[18] Interpretations of Jotnian sandstone imply that much of the Baltic Shield have had faint relief since the Mesoproterozoic,[19][20] but no exhumed peneplain from this period has been preserved.

[8] Karna Lidmar-Bergström and co-workers assume the peneplain formed through a cycle of erosion with a preceding brief valley phase and that it grades down to a former sea level.

[1][6] Due to the absence of land vegetation in Precambrian times sheet wash is thought to have been an important process of erosion leading to the formation of extensive pediments.

[12] In Norway's Finnmark the peneplain is roughly coeval with the formation of kaolinite, smectite and illite up to 15 m below the surface's contact with marine sedimentary rock of Cambrian age.

This means the parent rocks of the sandstone were eroded and the sediment strongly reworked and weathered reaching sedimentary maturity with no other in-between step or hiatus.