1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
2. Section for Marine Geology, Geological Survey of Norway, Trondheim 7040, Norway
3. Department of Geology, University of Tartu, Tartu 50411, Estonia
4. Department of Geology, Tallinn University of Technology, Tallinn 19086, Estonia
5. The Fredy & Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
6. Department of Geosciences, University of Oslo, Oslo 0316, Norway