Abstract
This article discusses the reliability of shore‐line displacement curves based on pollen analysis in the Oslo Fjord area. The conclusion is that only small parts of the curves ‐ in the late Atlantic period ‐ are fairly reliable for the purpose of dating Mesolithic coastal sites. Twelve Mesolithic settlement sites from Østfold, south‐eastern Norway are classified morphologically. The author suggests a chronological lineal model with four succeeding phases: 1. The Fosna culture, 2. Late Boreal/early Atlantic group, 3. The N⊘stvet culture, 4. Late flint‐point using group. A connection between the Fosna culture and early Maglemose culture is claimed. A study of the ecological adaptation in the four phases is based on topographical conditions, on the distribution and situation of settlement sites, and on animal bones from three Mesolithic sites in south‐eastern Norway. Hypotheses on seasonal migrations are suggested.

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