Climate changes in the pre-Hirnantian Late Ordovician based on δ18Ophos studies from Estonia Männik, Peep ; Lehnert, Oliver ; Nõlvak, Jaak ; Joachimski, Michael M. Abstract Publication: Palaeogeography Palaeoclimatology Palaeoecology Pub Date: May 2021 DOI: 10.1016/j.palaeo.2021.110347 Bibcode: 2021PPP...56910347M