Extended Data Fig. 4: Stratigraphic background for IODP Site U1540.
From: Five million years of Antarctic Circumpolar Current strength variability
a, Age–depth plot for the Pliocene and Pleistocene sedimentary sequence at Site U1540 compared with biostratigraphic and palaeomagnetic tie points24. Vertical error bars represent the depth range of each stratigraphic marker (for example, the biostratigraphic ages were determined on core catchers during the expedition). Horizontal error bars represent age uncertainties adopted from the best-fit-interval output of the constrained optimization analysis of Southern Hemisphere biostratigraphic datasets. Palaeomagnetic ages are based on the geomagnetic timescale GTS2012. Further details are discussed in the methods section of ref. 54. b, ACC strength records of IODP Site U1540 tuned to Site U1541. c, Tuning points. d, Sedimentation-rate record at IODP Site U1540 and Site U1541.
