Acknowledgments

We are grateful to I. Vinn, W. Ausich, P. Shonk and R. McConnell for assistance during the field work in Saaremaa. Two anonymous reviewers are thanked for their constructive reviews. This work was partially supported by the Wengerd Fund and the Faculty Development Fund at The College of Wooster. O.V. acknowledges project SF0180051s08 "Ordovician and Silurian climate changes, as documented from the biotic changes and depositional environments in the Baltoscandian Palaeobasin."