Kalibangan: Fire Altars and the World's Oldest Ploughed Field

Kalibangan is an archaeological site in northern Rajasthan, India, where excavators uncovered an Early Harappan ploughed field of around 2800 BC, a fortified town of the Indus Valley Civilisation and rows of so-called fire altars. Excavated in the 1960s, it gave the clearest early proof that a distinct culture existed before the mature Indus cities. Its ploughed field is often described as the oldest ever found by archaeologists.

Setting and discovery

Kalibangan stands on the south bank of the Ghaggar, a river that now flows only in the monsoon but once carried much more water. The site consists of a western mound, an eastern mound and a smaller mound further east.

The Italian scholar Luigi Pio Tessitori noted the mounds while surveying antiquities in the region around 1917–19, but he died in 1919 before their age was recognised. In the 1950s Amalananda Ghosh of the Archaeological Survey of India identified the site as Harappan. Systematic excavation followed in nine seasons from 1960 to 1969 under B. B. Lal and B. K. Thapar.

The early settlement and the ploughed field

The lowest levels belong to a pre-Harappan, or Early Harappan, settlement. It was enclosed by a mud-brick wall forming a rough parallelogram, and its bricks had proportions of 3:2:1, different from the 4:2:1 standard of the later Indus cities. Its painted pottery belongs to what archaeologists call the Sothi-Siswal tradition.

In the final season, in 1969, excavators found a ploughed field just south of the early town wall. Two sets of furrows crossed each other in a grid: one set ran roughly east–west about 30 centimetres apart, the other north–south about 1.9 metres apart. Farmers in the area still plough fields in a similar criss-cross way to grow two crops together, such as a tall crop like mustard in the wide rows and a smaller one like gram in the narrow rows.

The field is generally dated to the first half of the 3rd millennium BC, around 2800 BC. It is direct evidence of the plough, whose spread transformed farming across Eurasia during what is sometimes called the secondary products revolution. Lal suggested that the early settlement was damaged by an earthquake, after which it was deserted for a time.

The Harappan town

After a break, the site was rebuilt in the mature Harappan style typical of the Indus Valley Civilisation. The western mound became a walled citadel divided into two parts, while the eastern mound formed a lower town laid out in a grid of streets with houses of mud brick.

Unlike Mohenjo-daro, where fired brick was used widely, Kalibangan’s builders relied mostly on sun-dried mud brick, keeping fired brick for drains, wells and bathing floors. The main streets of the lower town ran north–south and east–west, and the excavators noted that streets were built in a few standard widths. The two parts of the site were each surrounded by walls, a sign of the careful planning shared by Indus towns from Sindh to Haryana.

Finds include Indus seals and sealings, a cylinder seal, inscribed pottery, terracotta figurines, copper tools, beads and bangles of shell and terracotta. Graffiti on pottery shows that the Indus script was used here as in the large cities.

The fire altars

Kalibangan is best known for its fire altars. In the southern part of the citadel, several brick platforms supported rows of small oval or rectangular pits lined with clay. They contained ash, charcoal and in some cases a cylindrical or flat block of clay at the centre. Wells and bathing areas stood nearby, suggesting rituals that combined fire and water.

Similar pits were found in houses in the lower town and on the small eastern mound. Most archaeologists interpret them as places for fire rituals, and some have compared them with later Vedic fire altars. That comparison is debated, as the Harappan structures are much older and their function cannot be confirmed from texts.

Burials and abandonment

A cemetery south-west of the citadel contained three kinds of burials: extended bodies in rectangular pits, pots with bones or offerings in circular pits, and graves with only pottery and no skeleton. Grave goods included pottery, beads and mirrors.

The Harappan town was abandoned early in the 2nd millennium BC. Lal attributed this to the drying up of the Ghaggar, a view shared by many scholars, though the exact date and causes are still discussed. A site museum now displays finds from the excavations.

Timeline

• c. 3500–2600 BC: Early Harappan fortified settlement occupies the site (dates approximate).
• c. 2800 BC: The ploughed field is in use outside the town wall.
• c. 2600 BC: Mature Harappan town with citadel and lower town is built.
• c. 1900–1750 BC: The town is abandoned.
• c. 1917–19: Luigi Pio Tessitori notes the mounds.
• 1960–69: Excavations under B. B. Lal and B. K. Thapar.
• 1969: The ploughed field is discovered.
• 2003: First volume of the final excavation report is published.

Why it matters

Kalibangan showed that a well-organised farming society with walled towns existed before the great Indus cities. Its ploughed field offers rare direct evidence of early agriculture, and its fire altars provide some of the best clues to Harappan ritual life.