1. Department of Ocean Sciences University of California, Santa Cruz Santa Cruz CA USA
2. Division of Biology and Paleo Environment Lamont‐Doherty Earth Observatory of Columbia University Palisades NY USA
3. Now at Department of Earth and Planetary Sciences Harvard University Cambridge MA USA
4. Department of Geosciences The Pennsylvania State University University Park PA USA
5. Now at Department of Ecology and Evolution Yale University New Haven CT USA
6. Barnard College New York NY USA
7. Now at Department of Earth and Planetary Science University of California Santa Cruz Santa Cruz CA USA