A study of more than 400 bottom-sediment samples, collected from the continental shelf between the Stad peninsula and the Halten Bank, shows that, with regard to sediment distribution, the area can be divided into two parts: (1) a southern area off Møre, with depths mostly less than 200 m and to a great extent covered by winnowed glacial deposits consisting of sand, gravel and coarser material, and in the depressions covered with sand and pelitic sand; and (2) a northern area off Trøndelag, where depths mainly are between 200 m and 500 m, and where the sediments show great variation in textural character, to a certain degree dependant on depth, but also with great differences within areas of the same depths. Moderately well- to poorly sorted sand is present in a broad belt along the outer margin of the shelf and on the slope leading up to the Møre shelf. Inside this sand belt the sediments become finer and more poorly sorted, with pelitic sand (silty sand) changing into sandy pelite (clayey sand and sand/silt/clay). Pelitic gravelly sand occupies large parts of the shelf, especially on the western flank of the Halten Bank and the eastern slope of the Haltendjup depression. Coarse lag deposits are present in the most shallow parts of the Halten Bank. The origin of the surface sediments on the Trøndelag shelf is thought to represent retransported glacial deposits. The material consists of particles winnowed out from the shallow part of the Halten Bank and from the shallow Møre shelf to the south. The glacial origin of the material is shown by the form and roundness of gravel and stones, which agrees with typical glacial deposits, and by the form and microtextures of the sand grains. The winnowing and retransport of the glacial deposits is shown, from the study of cores, to have taken place mainly during the last 10,000 years, i.e. during the Holocene after the warm Atlantic water entered the area of the Norwegian continental shelf. The sediment transport is a result of the hydraulic regime, and in general, sediments have been transported from areas of coarse-skewed deposits to areas of finer- and fine-skewed deposits. From recent current measurements on the Trøndelag shelf, it seems probable that erosion and transport of sand, as well as of unconsolidated silt and clay, takes place today, at least down to depths of 300–400 m. On the continental slope this zone reaches down to 600–700 m. The present sediment distribution is, therefore, thought to represent, at least to a certain degree, the effect of the present hydraulic regime. The lithologic, paleontologic, and chronostratigraphic investigation of 18 cores from the Trøndelag shelf, and a comparison with cores sampled off Stad, indicates the following environmental evolution: Following the retreat of the ice on the continental shelf during the Middle Weichselian, the sea conditions were high (mid) arctic, with a great deal of seaice and icebergs, causing ice-rafting and the formation of glacial diamictons. This environment was succeeded by a somewhat less arctic environment which lasted till about 13,000 yr. B.P. when the sea became distinctly less arctic, probably low arctic, with a warmer element in the fauna, and with less ice-rafting. This was probably due to a certain influence of Atlantic water. The change from low arctic to boreal conditions, took place about 10,000 yr. B.P. At the same time the hydraulic regime must have changed drastically, with currents (and waves) beginning to have a strong winnowing effect on the bottom sediments. This is thought to indicate the real introduction of the Atlantic current in the area.