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Pollen, diatom and plant macrofossil assemblages indicate a low water level phase of Lake Peipsi at the beginning of the Holocene

Author:
Hang, Tiit, Kalm, Volli, Kihno, Kersti, Milkevičius, Martynas
Source:
Hydrobiologia 2008 v.599 no.1 pp. 13-21
ISSN:
0018-8158
Subject:
Bacillariophyta, Dryas, flora, ice, lakes, pollen, sand, watersheds
Abstract:
During the Fennoscandian ice recession from the eastern Baltic area, the water level in the Lake Peipsi basin was decreasing and reached a minimum at the end of the Younger Dryas Chronozone. The low lake level episode is represented in the basal deposits by a ca. 0.8 m thick bed of coarse detritus gyttja dated to 9.6-9.1 ka ¹⁴C BP. The gyttja lies at an elevation of 20-21 m a.s.l., i.e. about 9 m below the present lake level (30 m a.s.l.), and is buried under a 1.5-2 m bed of fine to medium-grained sand. The overall pollen data indicate a shallow-water littoral environment during the gyttja accumulation in the area studied. The diatom flora in the gyttja is dominated by shallow-water benthic and epiphytic taxa, indicating eutrophic littoral conditions at the time of gyttja accumulation. In the uppermost portion of the gyttja sequence the pollen and diatom successions indicate a short period of land emergence when swampy conditions prevailed in the surroundings.
Agid:
460345