However, the source of the young (less than a million years old) and enormous Australasian strewnfield (c. 790 ka) is suggested to be a crater about 100 kilometers across somewhere in Indochina, Povenmire H., Liu W. and Xianlin I. (1999) "Australasian tektites found in Guangxi Province, China", 30th Annual Lunar and Planetary Science Conference, Houston, March 1999.