Figure F33. A. Composite digital photograph of shipboard ICP-OES analyses of Si, Al, Ti, Fe, and Mg on 2-cm bulk sediment scrapes across the Paleocene–Eocene (P/E) boundary from Sites 1220 and Sites 1221. Elevated concentrations of all these elements in the boundary interval reflect low CaCO₃. Different levels of elements through the interval reflect the distinct color bands. B. Composite digital photograph of shipboard ICP-OES analyses of Ca, Sr, Ba, P, and Mn on 2-cm bulk sediment scrapes across the P/E boundary from Sites 1220 and Sites 1221. The difference in behavior between Ca and Sr reflects recrystallization. A strong Mn peak flanked by P and Ba peaks is characteristic of the boundary interval.