According to Rao, Hakra Ware has been found at Bhirrana, and is pre-Harappan, dating to the 8th-7th millenium BCE.
According to Dikshit and Rami, the estimation for the aniquity of Bhirrana is based on two calculations of charcoal samples, giving two dates of respectively 7570-7180 BCE, and 6689-6201 BCE.