[1] Univ Tartu, Inst Ecol & Earth Sci, EE-51014 Tartu, Estonia
[2] GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, D-14473 Potsdam, Germany
[3] Geol Survey Denmark & Greenland, Oster Voldgade 10, DK-1350 Copenhagen K, Denmark
[4] Lantmateriet, Geodata Div, Lantmaterigatan 2C, S-80182 Gavle, Sweden
[5] Friedrich Schiller Univ, Inst Geog, Jena, Germany
[6] Geol Survey Finland, POB 96, Espoo 02151, Finland
[7] Univ Turku, Dept Geog & Geol, FI-20014 Turku, Finland
[8] Dalarna Univ, Off Educ & Res, S-79188 Falun, Sweden
[9] Geol Survey Sweden, Box 670, S-7512819 Uppsala, Sweden
[10] Gothenburg Univ, Dept Earth Sci, Box 460, S-40530 Gothenburg, Sweden
[11] Lund Univ, Dept Geol, Solvegatan 12, S-22362 Lund, Sweden
[12] Univ Copenhagen, Fac Sci, Dept Geosci & Nat Resource Management, Oster Voldgade 10, DK-1350 Copenhagen K, Denmark
[13] Tarnby Gymnasium Og HF, Tejn Alle 5, DK-2770 Kastrup, Denmark
[14] Alfred Wegener Inst, Helmholtz Ctr Polar & Marine Res, Wadden Sea Res Stn, Hafenstr 43, D-25992 List Auf Sylt, Germany
[15] Univ Kiel, Inst Geosci, Olshausenstr 40, D-24118 Kiel, Germany
[16] Greifswald Univ, Inst Geog & Geol, D-17487 Greifswald, Germany
[17] Inst Biota GmbH, D-18246 Butzow, Germany
[18] Polish Geol Inst, Branch Marine Geol, Natl Res Inst, Koscierska 5, PL-80328 Gdansk, Poland
[19] Nat Res Ctr, Akad Str 2, LT-08412 Vilnius, Lithuania
[20] Univ Latvia, Inst Biol, Miera Iela 3, LV-2169 Salaspils, Latvia
[21] Tallinn Univ Technol, Inst Geol, Ehitajate Tee 5, EE-1908645 Tallinn, Estonia
[22] Herzen State Pedag Univ Russia, Moika Emb 48, St Petersburg 191186, Russia
[23] Russian Acad Sci, Inst Water & Environm Problems, Siberian Branch, Molodezhnaya St 1, Barnaul 656038, Russia
[24] Immanuel Kant Baltic Fed Univ, A Nevsky St 14, Kaliningrad 236016, Russia