[1] Univ Liverpool, Dept Geog & Planning, Liverpool L69 7ZT, Merseyside, England
[2] Univ Oxford, Ctr Environm, South Parks Rd, Oxford OX1 3QY, England
[3] British Geol Survey, Geochronol & Tracers Facil, Keyworth NG12 5GG, Notts, England
[4] Croatian Geol Survey, Dept Geol, Sachsova 2, HR-10000 Zagreb, Croatia
[5] Univ Novi Sad, Fac Sci, Trg Dositeja Obradov 3, Novi Sad 21000, Serbia
[6] Romanian Acad, Inst Speleol, Clinicilor 5, Cluj Napoca 400006, Romania
[7] Uppsala Univ, Dept Earth Sci, Villavagen 16, S-75236 Uppsala, Sweden