Fig. 1: Contrasting indications of the astronomical pacemaker of Antarctic glacial-interglacial cycles during the high CO2 mid-Cenozoic unipolar icehouse.
From: Eccentricity pacing and rapid termination of the early Antarctic ice ages
a atmospheric carbon dioxide (pCO2) reconstructions with 2σ uncertainties7, from phytoplankton (cyan triangles) and boron isotopes (blue circles). b marine benthic foraminiferal oxygen isotope (δ18Ob) composite record CENOGRID5 with 10-point (black) LOESS smoothing, relevant climate events and glacial states shown. c contrasting astronomical pacing of two marine δ18Ob records (ODP sites 926 and 1264, refs. 19,29) 26−18 Ma. d power spectra for the data shown in c. Vertical black lines denote bandwidths used throughout this paper. e Antarctic (ice-proximal) records AND-2A, CRP-2/2A, and DSDP Site 270 with colours representing simplified lithology from refs. 18,22,23: light grey mudstone (often including ice-rafted debris), dark grey sandstone, green diamictite, brown sandstone, and sinusoidal lines disconformities. The question mark in DSDP Site 270 denotes uncertain lithological age. Site locations shown in Figure S1.
