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dc.contributor.authorBergstrøm, Bjørn
dc.coverage.spatialSANDEFJORD
dc.coverage.spatialFÆRDER
dc.coverage.spatialSKIEN
dc.coverage.spatialLARVIK
dc.coverage.spatialTELEMARK
dc.coverage.spatialBAMBLE
dc.coverage.spatialVIKEN
dc.coverage.spatialVESTFOLD
dc.coverage.spatialPORSGRUNN
dc.date.accessioned2020-08-26T09:07:41Z
dc.date.available2020-08-26T09:07:41Z
dc.date.issued1999
dc.identifier.urihttps://hdl.handle.net/11250/2674195
dc.description.abstractA revised and more detailed deglaciation chronology is presented in the soputhern Telemark and Vestfold, southeastern Norway, based mainly on information and results from mapping projects on the superficial deposits carried out by NGU during the last 20 years. The deglaciation of this area started about 13,000 years B.P., when the receding ice margin was grounded along the coast.Distally to Jomfruland, submarine moraine ridges deposited in front of the ice may correlate with the Gøteborg Moraine on the west coast of Sweden dated to 12,900-12,600 years B.P. The ice margin retreated some distance proximally to the Jomfruland Island before 12,240+- 80 years B.P. A glacier advance occured at 12,200-12,000 years B.P. and the ice margin reached Jomfruland, probably correlating with the Tjøme-Hvaler ice marginal deposits in the outer Oslofjord area. The position of the Slagen-Onsøy ice margin about 11,400-11,200 years B.P. is tentatively reconstructed west- ward from Oslofjord. During the late Allerød\/early Younger Dryas (after 11,300 years B.P.) the glaciers readvanced and in the Kragerø area the ice front moved at least 10 km, and most likely 17-18 km to form the distinct Ra (Younger Dryas) moraines at about 10,800-10,600 years B.P. The submarine Ra moraines have been mapped by seismic profling and show a concave calving ice margin in the outer Langesundfjord area (the Langesund Channel) during the deposition. The Eidanger ice-marginal deposits are dated to 10,400-10,300 years B.P., and correlated with the Ås moraines. The Geitryggen Ice-marginal deposits are complex and indicate a marked halt and readvance of the ice margin 10,100-10,000 years B.P. corresponding to the Ski moraines in the Oslofjord area. After the Geitryggen event, the ice margin receded rapidly and the Akker- haugen (9,800 Years B.P.) and Nordagutu (9,700 years B.P.) ice-marginal deposits were form
dc.language.isoeng
dc.relation.ispartofseriesNGU Bulletin (435)
dc.rightsNavngivelse 4.0 Internasjonal
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no
dc.subjectBREBEVEGELSE
dc.subjectMORENE
dc.subjectDATERING
dc.subjectGEOMORFOLOGI
dc.titleGlacial geology,deglacition chronology and sea-level changes in the southern Telemark and Vestfold counties, Southeastern Norway
dc.typeJournal article
dc.description.localcode49259
dc.source.pagenumber23-42


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