The excavation has revealed these cultural periods; Period IA: Hakra Wares Culture, Period IB: Early Harappan Culture, Period IIA: Early Mature Harappan and Period IIB: Mature Harappan Culture.Period IA: Hakra Wares Culture: The excavation has revealed the remains of the Harappan culture right from its nascent stage, i.e.The pottery repertoire is very rich and the diagnostic wares of this period included Mud Applique Wares, Incised (Deep and Light), Tan/Chocolate Slipped Wares, Brown-on-Buff Wares, Bichrome Wares (Paintings on the exterior with black and white pigments), Black-on-Red Ware and plain red wares.The Period IB: Early Harappan Culture: The entire site was occupied during this period.The settlement was an open air one with no fortification.The mound measures 190 m north-south and 240 m east-west and rises to a height of 5.50 m from the surrounding area of flat alluvial sottar plain.The Excavation Branch-I, Nagpur of the Archaeological Survey of India excavated this site for three field seasons during 2003-04, 2004–-06.
The site is situated about 220 km to the northwest of New Delhi on the New Delhi-Fazilka national highway and about 14 km northeast of the district headquarters on the Bhuna road in the Fatehabad district.
The site is one of the many sites seen along the channels of the ancient Saraswati riverine systems, now represented by the seasonal Ghaggar River which flows in modern Haryana from Nahan to Sirsa.
The walls and floor of these pits were plastered with the yellowish alluvium of the Saraswati valley.
The artefacts of this period comprised a copper bangle, a copper arrowhead, bangles of terracotta, beads of carnelian, lapis lazuli and steatite, bone point, stone saddle and quern.
Hakra Wares Culture (antedating the Known Early Harappan Culture in the subcontinent, also known as Kalibangan-I.) to a full-fledged Mature Harappan city.
Prior to the excavation of Bhirrana, no Hakra Wares culture, predating the Early Harappan had been exposed in any Indian site.