Palaeoreconstruction of the Baltic Ice Lake in the Eastern Baltic - The Baltic Sea Basin - page 195

Fig. 9.4 BIL 12,200 cal. years BP, stage BI. Isobases show the reconstructed water level above
present sea level in metres. Black dots show the location of used shoreline sites

9.3.4 BIL 12,000 cal. years BP (BII)

After the retreat of the ice margin from the Ss I to the Ss II, BIL stage BII developed
(Fig. 9.5 ) . Its coastal formations are located lower than previous BI ones: in Finland
about 10 m, in northern Estonia about 5 m and in southern Estonia and Latvia about
1-2 m. However, in NE Estonia in the northern part of Lake Peipsi, BII isobases are
up to 0.5 m higher than BI ones. The reason for that is not yet clear. The BIL water
level at Võrtsjärv threshold was 40 1 m a.s.l.

Lakes Peipsi and Võrtsjärv were closed basins with considerably lower water levels
than today, especially Lake Võrtsjärv, which was most likely dry land (Fig. 9.5 ) .
Lake Peipsi had the water only in the northern part of the lake and it could still have
very shallow connection with the BIL depending on the threshold altitude. Lake
Ladoga in NW Russia was connected with BIL over Karelian Isthmus and Neva
valley.

± 1m a.s.l. and at Peipsi threshold 31.5 ±