Abstract
Abstract The biostratigraphy at two sites, Lake Uppsalstjarnet and Lake Osten, southwestern Varmland, southwestern Sweden, has been investigated. The main interest is put on glaciomarine and marine sediments deposited shortly after deglaciation. Foraminifera and molluscs were present at the deglaciation and some hundred years after. Arctic faunas dominate in the lowermost layers, deposited close to the ice front. A transition to faunas affected by increased meltwater influence and higher temperature is recorded higher up in the sequences. AMS-datings of bivalves and foraminifera have yielded ages between ca. 10,100 and 9750 BP, which infers that southwestern Varmland was deglaciated during the latest part of the Younger Dryas to early Preboreal. The marine sediments are overlain by varved and sulphide stained clay units, deposited when a connection with the sea still was open, but the ingression of saline water had ceased.
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