Extended Data Fig. 1: Distribution of ages of metamorphism.

The distribution of ages of metamorphism is characterized by peaks at about 2.6, 1.9, 1.0, 0.5 and <0.2 Gyr ago. For the statistical evaluation of metamorphic data presented in this paper, the data were binned about each of these discrete peaks to provide more statistically robust (with higher number of data points) interpretations.