1. Department of Earth and Environmental Sciences Columbia University New York NY USA
2. Now at Department of Earth and Planetary Sciences Harvard University Cambridge MA USA
3. Division of Biology and Paleo‐Environment Lamont‐Doherty Earth Observatory of Columbia University Palisades NY USA
4. Now at College of Fisheries and Ocean Sciences, University of Alaska Fairbanks Fairbanks AK USA
5. Now at Department of the Geophysical Sciences University of Chicago Chicago IL USA
6. Now at Rosenstiel School of Marine and Atmospheric Science University of Miami Miami FL USA
7. Now at Department of Ocean Sciences University of Santa Cruz Santa Cruz CA USA