Table 1.

Early Pliocene tie points used for our age model.

ODP Hole	Depth (mbsf)	Depth (mcd)	Paleomagnetic reversal	Age model of Channell et al. (1999)	Update to Hilgen et al. (2012)
907A	66.8	74.54	Gauss/Mammoth	3.58	3.596
907A	70.5	78.24	Top Cochiti	4.18	4.187
907A	89.5	97.64	Base Gilbert	5.89	6.033

Depth (mbsf = meters below sea floor, mcd = meters composite depth) for polarity chron boundaries from ODP Hole 907A and the corresponding age from ref.⁴⁵. We updated these ages to the Astronomically Tuned Neogene Timescale 2012⁴⁷.