Linear correlation of log gamma-ray (interval 0-225 mbsf) from Hole U1313B and benthic oxygen isotope stack over last 5.4 Ma (Lisiecki and Raymo, 2005). Both data sets are shown with scales inverted so that warm interglacials/low gamma-ray (ie low Th =low clay) intervals are shown as prominent peaks. The correlation has only two tiepoints at 0 and 5.2 Ma with no stretching or squeezing of log data depths.