Proglacial lake shorelines of Estonia and adjoining areas

Abstract. A uniform database of the proglacial lake coastal landforms of Estonia, Latvia and NW Russia was created and
used to reconstruct the spatial distribution of proglacial lakes using the kriging point interpolation and GIS approaches. Correlation
of the Late Glacial coastal landforms confirms that the proglacial lake stage A1 in Estonia is synchronous with the BglI
level in Latvia and with one level in NW Russia of undefined index. Proglacial lake A1 was formed concurrently with
theAbstract. A uniform database of the proglacial lake coastal landforms of Estonia, Latvia and NW Russia was created and
used to reconstruct the spatial distribution of proglacial lakes using the kriging point interpolation and GIS approaches. Correlation
of the Late Glacial coastal landforms confirms that the proglacial lake stage A1 in Estonia is synchronous with the BglI
level in Latvia and with one level in NW Russia of undefined index. Proglacial lake A1 was formed concurrently with
the Pandivere-Neva ice-margin about 13,300 cal. yrs BP. Proglacial lake A2 level formed probably about 12,800 cal. yrs BP
and correlates with the level of BglII in Latvia andGIII inNWRussia. Simulated isobases of proglacial lake water-levels show
a relatively regular pattern of the land uplift along the eastern coast of the Baltic and in the northern part of the Lake Peipsi basin,
with a steeper tilt towards the northwest. Isobases in the southern part of the Lake Peipsi basin are curving towards SE and
are up to 14 m higher than expected from the regional trend. This phenomenon can reflect the forebulge effect during
the deglaciation and its later collapse. Shoreline reconstruction suggests that proglacial lakes in the Peipsi and Baltic basins
were connected via strait-like systems and had identical water levels. Our reconstructions also show that after the glacier
halted at the Pandivere-Neva ice margin about 13,300 cal. yrs BP, there was a connection with the initial Baltic Ice Lake in
the west of the Gulf of Riga. Pandivere-Neva ice-margin about 13,300 cal. yrs BP. Proglacial lake A2 level formed probably about 12,800 cal. yrs BP
and correlates with the level of BglII in Latvia andGIII inNWRussia. Simulated isobases of proglacial lake water-levels show
a relatively regular pattern of the land uplift along the eastern coast of the Baltic and in the northern part of the Lake Peipsi basin,
with a steeper tilt towards the northwest. Isobases in the southern part of the Lake Peipsi basin are curving towards SE and
are up to 14 m higher than expected from the regional trend. This phenomenon can reflect the forebulge effect during
the deglaciation and its later collapse. Shoreline reconstruction suggests that proglacial lakes in the Peipsi and Baltic basins
were connected via strait-like systems and had identical water levels. Our reconstructions also show that after the glacier
halted at the Pandivere-Neva ice margin about 13,300 cal. yrs BP, there was a connection with the initial Baltic Ice Lake in
the west of the Gulf of Riga.