Sub-fossil remains of macrofauna extracted from a 5.3 m sediment core in the central part of Limfjorden indicate marked changes in salinity. Sub-fossils in the lower part of the core indicate marine conditions similar to those of the present North Sea, while the upper 2 m of the core represents periods of brackish conditions alternating with periods of intermediate salinity similar to the present condition, indicative of alternating opening and closure of the fjord to the west. Precise 14 C dating of changes is hampered by variable marine reservoir effects and the addition of old carbonate from ground-water run-off. Salinity indications from dinoflagellate cyst assemblages from this core, but published elsewhere, are in accordance with those from macrofauna assemblages.
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