The oldest reported rocks/mineral ages from the Indian subcontinent, based on radiometric dating (notably ancient zircon grains and gneissic rocks from cratonic blocks such as the Singhbhum craton and Bundelkhand craton), approach but do not reach the very earliest Hadean ages found elsewhere in the world (such as the ~4.4 Ga Jack Hills zircons of Australia); the oldest dated material from India is on the order of approximately 4500 million years (Ma), close to the age of the Earth's formation itself.