Extended Data Figure 6: Aligning the temperature record to LR04 to refine the age model.
From: A progressively wetter climate in southern East Africa over the past 1.3 million years
a, Age versus depth for drill site MAL05-1, depicting ages based on 14C, tephra, magnetic reversals and alignment (tuning) of corrected temperature with LR04. The dashed pink line is a linear fit through the dates derived from radiocarbon, tephra and magnetic reversals only, described by the equation: Age (in kyr before present) = −12.44 + 3.602z (r2 = 0.9984). b, Blackman–Tukey analysis (spectral power versus per metre) of the corrected temperature data in the upper 200 m of drill site MAL05-1, showing a 33.6-m cycle, which corresponds to about 121 kyr. Bandwidth is 0.0001 and 80% error estimate on the power spectrum is 0.626. c, Temperature plotted against age based solely on radiocarbon, tephra and magnetic reversal dates aligned to the LR04 age scale (green dashed lines), in order to assign ages in MAL05-1 between 75 kyr ago (Toba ash horizon) and 590 kyr ago (Ar–Ar). The red lines depict tephra and magnetic reversal ages, which constrain the temperature alignment. B/M, Brunhes–Matuyama; UJ, Upper Jaramillo; LJ, Lower Jaramillo; UCM, Upper Cobb Mountain; LCM, Lower Cobb Mountain. Data are from ref. 14.
