Figure 2.

Comparison of planktonic foraminiferal B/Ca (a–c) and bulk carbonate δ¹³C records (d). ODP 1209 (solid black circles) [10], 689 (open light green squares), 690 (solid green squares) and DSDP 401 (solid orange squares) [12] are pelagic sites (a–c). ODP sites Bass River (solid blue triangles) [11] and Ancora (light blue triangles) are continental shelf sites (a–c). Bulk carbonate δ¹³C records (d) are labelled in the same colour scheme as B/Ca records (a–c). Sites 1209 [9], 401 [12], 690 [25], 689 [18], Bass River [26] and Ancora [27] are plotted versus age in kiloyears relative to the onset of the CIE. A detailed explanation of the age model construction for each site can be found in the Methods section. Analytical reproducibility of B/Ca based on repeated analysis of in-house laboratory consistency standards is 6% and 7% (2 s.d.) at Rutgers University and University of California Santa Cruz, respectively [10,11]. Vienna Pee Dee Belemnite (VPDB) carbon isotope standard. (Online version in colour.)