Figure F23. Summary of trends in cations (A) Na⁺, (B) Mg²⁺, Ca²⁺, and K⁺, and (C) Sr²⁺ and Li⁺. Note the abrupt shift in the concentration of all constituents except Sr²⁺ between Cores 182-1128B-26X (236.8 mbsf) and 28X (253.1 mbsf).