Summary
The map-sheet Bjøllådal, 2028 II, covers a part of the area of a Quaternary mapping programme carried out by NGU in the Saltfjellet district of Nordland. The superficial deposits are classified according to their genesis, and described. The directions of ice movements have been reconstructed mainly on the basis of glacial striae and drumlins, and the course of deglaciation established based on ice movements, marginal moraines, meltwater and the distribution of glacial deposits. The ice movements can be divided intor three main phases: 1) The oldest observed movement direction, towards the west. 2) A younger movement directed towards the northwest. 3) At the end of the deglaciation all the high mountains were ice-free, but glacier tongues flowing from the inland ice further east still occupied the valleys. During the deglaciation c. 9000 yrs. B.P. there were readvances of the inland ice, each one depositing marginal moraines, glaciofluvial and glacio- lacustrine deposits. At the end of the deglaciation extensive ice-dammed lakes developed, especially in Bjøllådalen where ice movements and meltwater drainage were directed towards the north, opposite to the present drainage of Bjøllådalen. The last ice remnants were located in the main valley. Dunderlandsdalen were the ice front receded towards the east. Till is the most common deposit, thick deposits occurring mainly in the valleys.
