Fig. 4.

Gray scale CT scan images and facies assignments of cores collected along the Thwaites Glacier margin from west (Left) to east (Right). Water depths are given in italics below the core IDs. Grain size data for megacores MC12 (= site JGC11) and MC16 (= site KC15) are included. The pale green area marks the core intervals with excess ²¹⁰Pb activity; no excess activity was detected in cores KC15 and KC19. Red text indicates ²¹⁰Pb ages (in years C.E.) for the basal boundary of Facies 1 in cores KC04 and MC12; uncertainty was calculated from the SE of the ages. MICADAS ¹⁴C ages (in cal. yr B.P., respectively) are shown with italicized text for cores KC04, KC15, and KC19. Fine gray lines highlight Facies 3 beds that can be correlated between cores KC15 and KC19. Sediments in the lower half of KC13 are faulted as result of natural processes or coring disturbance; therefore, no facies are assigned. Compilations of all core data for JGC11, KC13, KC15, KC19, and KC23 are provided in the SI Appendix, Figs. S1–S5.