Interstadial glaciomarine sediments at Jæren in south-western Norway have been investigated for their composition, distribution and age, and a model for the depositional environment is proposed. In the northern and central parts of Jæren, the interstadial sediments consist of laminated and homogenous silty clays overlain by homogenous glaciomarine diamictons. In the southernmost part, homogenous silt and stratified glaciomarine diamictons prevail. The sediments are found below the uppermost till, and radiocarbon dating of marine fossils suggests an age of c. 35-30 14C ka BP. The sediments were probably deposited during a relatively short period during the deglaciation into the Middle Weichselian Sandnes interstadial. The glaciomarine sediments are commonly found well above the postglacial marine limit, and their upper limit rises from c. 30 m in the northern part of Jæren to c. 200 m in the southern region. The high elevation of the glaciomarine sediments suggests a significant glacioisostatic depression, which may be explained by combined loading from both the inland ice and an ice stream in the Norwegian Channel.
Weichselian interstadial sediments on Jæren (SW Norway) – paleoenvironments and implications for ice sheet configuration