Timothy Herbert¹, Rebecca Rose¹, Alexandrina Tzanova¹, Weimin Si¹, Colleen A Dalton², Andrea M Salazar³, Rasmus Rumph Frederiksen⁴, Karen Dybkjaer⁵ and Katarzyna Sliwinska⁶, (1)Brown University, DEEPS, Providence, RI, United States, (2)Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States, (3)The University of Chicago, Chicago_, United States, (4)Aarhus University, Aarhus C, Denmark, (5)Geological Survey of Denmark, Copenhagen, Denmark, (6)Stratigrafisk afdeling, Copenhagen K, Denmark