This has been supported by PERSON@1 who has pushed the date of the zircon crystals found in the metamorphosed quartzite of LOCATION@1 in LOCATION@2 , previously thought to be NUMBER@1 -- NUMBER@2 Ga , to NUMBER@3 Ga. .

The date of the zircon crystals found in the metamorphosed quartzite of LOCATION@1 in LOCATION@2 , has been pushed to NUMBER@3 billion years .
