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The Holocene
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Fauna and flora in submarine early Holocene lake-marl deposits from the southwestern Baltic Sea

Ole Bennike

Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen NV, Denmark

Wolfram Lemke

Baltic Sea Research Institute, Seestrasse 15,D-18119 Rostock-Warnemünde, Germany)

Jørn Bo Jensen

Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen NV, Denmark

Studies of plant and animal macrofossils have been carried out on early-Holocene lake marls from the southwestern Baltic. The records have been dated to the interval from c. 8500 to 7800 14C years BP by correlating pollen assemblages to an onshore radiocarbon dated pollen diagram. The sediments contain from 5 to 81% carbonate, and only few macroscopic remains of wetland and terrestrial taxa. The plant and animal (mainly mollusc) macrofossils reflect deposition at the outer edge of the belt with submerged macro-limnophytes, in the lower littoral, perhaps at water depths at 4–7 m. The ratio between the shells and opercula of the snail Bithynia tentaculata points to some post-mortem disturbance, but it can be concluded that the water was highly alkaline and mesotrophic.

Key Words: Holocene • marl • chalk • plant macrofossils • mollusc • Baltic Sea

The Holocene, Vol. 8, No. 3, 353-358 (1998)
DOI: 10.1191/095968398673688465
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