India and Ur

Estimates of stabilization ages of the world's Precambrian cratons reveal a pattern in which all blocks stabilized at ages ≥ 3.0 Ga occur in one area of the end- Paleozoic supercontinent Pangea. These blocks center around India, where at least two cratons (Western Dharwar and Singhbhum) show evidence of crustal growth terminating at or before ∼3.0 Ga. This concentration of ≥3.0-Ga blocks is regarded as an Archean supercontinent referred to as "Ur."