NUMBER 



FIGURE 3. (top) Annual Mg/Ca cycles (moles) measured by laser ablation-inductively coupled plasma- 

 mass spectrometry, (bottom) Mg/Ca cycles superimposed on a cross-section view of C. compactiau. The 

 white line laser transect is along the growth axis (Halfar et al., 201 la). 



FIGURE 4. Mg/Ca time series from C. conipacttini near St. Johns, Newfoundland (average of two samples), and 

 instrumental temperatures at a nearby oceanographic station (station 27.0 m depth; 1950-2004); = 0.51, 

 p < 0.00 1 (Gamboa et al., 20 1 0). 



