Figure 1. Fission-track ages and track-length distributions measured for Alboran Sea samples from Hole 976B. Intercepts on the circular age scale of the radial plots (left) yield individual crystal ages and result from linear extrapolation from the left-hand origin through each crystal age. The position on the x-scale is determined by the precision of each individual crystal age (Galbraith, 1990). Dashed lines show sample stratigraphic ages.