Timeline of the Harappan Civilization is Pushed Back 2,500 Years as Researchers Find New Reason for Its Fall

Timeline of the Harappan Civilization is Pushed Back 2,500 Years as Researchers Find New Reason for Its Fall

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A recent discovery suggests that the Indus Valley Civilization is at least 8,000 years old, not 5,500 as previously believed. Moreover, the researchers show that its power dwindled because of weaker monsoons.

According to The Times of India , the Indus Valley Civilization (also known as the Harappan Civilization) existed at least 8,000 years ago, making it one of the oldest known civilizations in the world – along with the Egyptian (7000BC to 3000BC) and Mesopotamian (6500BC to 3100BC) civilizations. The results of the study by scientists from IIT-Kharagpur and the Archaeological Survey of India (ASI) were published in the journal Nature on May 25.

So-called "Priest King" statue, Mohenjo-Daro, late Mature Harappan period, National Museum, Karachi, Pakistan. ( Mamoon Mengal/CC BY SA 1.0 )

The discovery may mean that history books will have to be rewritten because earlier it was believed that the Indus Valley civilization was only 5,500 years old. The leader of the project, Anindya Sarkar, also believes that their research provides evidence that the civilization did not fall due to climate change but was influenced by it. The team discovered the oldest pottery from the civilization, which was made during the period called Early Mature Harappan (c. 6,000 years ago) and the pre-Harappan Hakra phase - as far back as 8,000 years.

The researchers set out to explore Lothal, Dholavira, and Kalibangan in India. They also dug in a mostly unexplored site, Bhirrana. They wanted to prove that the Indus Valley civilization spread to other Indian sites like Bhirrana and Rakhigarrhi in Haryana, apart from the known locations of Harappa and Mohenjo Daro in Pakistan. However, they discovered something much more impressive.

Panoramic view of the excavation of mature Harappan stage at Bhirrana view from North-east. ( Archeological Survey of India )

The team unearthed large quantities of animal remains; including horn cores and the teeth and bones of cow, goat, antelope, and deer. These remains were put through Carbon 14 testing. Arati Deshpande Mukherjee of Deccan College, who helped analyze the finds along with researchers at the Physical Research Laboratory in Ahmedabad, explained:

"We analysed the oxygen isotope composition in the bone and tooth phosphates of these remains to unravel the climate pattern. The oxygen isotope in mammal bones and teeth preserve the signature of ancient meteoric water and in turn the intensity of monsoon rainfall. Our study shows that the pre-Harappan humans started inhabiting this area along the Ghaggar-Hakra rivers in a climate that was favourable for human settlement and agriculture. The monsoon was much stronger between 9000 years and 7000 years from now and probably fed these rivers making them mightier with vast floodplains.''

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The team believes that the civilization spread over a vast expanse of India, but the only evidence for this came from British excavations. The most recent research by the Indian team also suggests that climate change was probably not the sole cause for the collapse of the civilization. The people of the Harappan Civilization did not seem to give up despite the weakening monsoon. They did not disappear, but they changed their farming practices by switching from water-intensive crops to drought-resistant crops. This was the beginning of a new era in the civilization’s existence.

Diorama reconstruction of everyday life in Indus Valley Civilization, New Delhi. ( Biswarup Ganguly/CC BY 3.0 )

The researchers believe that this change in their subsistence strategy - shifting crop patterns from the large-grained cereals like wheat and barley during the early part of the intensified monsoon to drought-resistant species of small millets and rice in the later part of declining monsoon - played a large role in the civilization’s fall as well. Moreover, the researchers discovered that from 7,000 years ago onwards, the monsoons became progressively weaker.

Map of Northwest India and Pakistan showing the locations of main Harappan settlements including phosphate sampling site of Bhirrana, Haryana, IWIN precipitation sampling station at Hisar and two paleo-lakes Riwasa and Kotla Dahar studied earlier. Black arrow indicates the direction of monsoon moisture transport from Bay of Bengal. ( Sarkar et al )

Some of the first accounts of the Indus Valley Civilization were recorded in the 1800s by the British. In 1826, the British army deserter James Lewis noticed the presence of ruins in a small town in Punjab called Harappa. It was because of this discovery that the civilization was called ‘Harappan.’

  • Archaeologists say the Indus civilization wasn’t nearly as peaceful as popularly thought
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Harappan settlements were urbanized and well-organized. They had regular trade with Mesopotamia and the Middle East. Their material and craft culture was well-developed too. However, during the later phase of the Harappan existence their population dropped and they abandoned many settlements. For decades, researchers have tried to find the reasons behind this change. The first excavations in search of this answer took place in the 1920s and were led by John Marshall, but major works only started in 1986, when George Dales of the University of California at Berkeley established the Harappan Archaeological Project. This new study helps to put researchers one step closer to understanding the Harrapan civilization’s story.

A large well and bathing platforms are remains of Harappa's final phase of occupation from 2200 to 1900 BC. ( Obed Suhail/CC BY SA 3.0 )

Elaine Cohen is a professor of computer science at the University of Utah. She inspired Bruce Gooch to pick up the teaching baton and pass what he learned — and more — on to a whole new generation of students.

Bruce Gooch wasn’t your typical computer student. For starters, his background was in mathematics, and he had no idea how to code.

“I used to be an actuary, and, after a wildly unsuccessful job search, was looking for something new.”

He decided to go back to school for computer science. By his own admission, he looked more like an outlaw biker than a professor. But once he began studying with Elaine, preconceptions fell away and he found the space and support he needed to excel.

Elaine showed Bruce that coding could be creative. By giving him the responsibility and ownership to explore his ideas, he found the inspiration to make new leaps in the field. As he puts it, “Elaine took away the chains from my mind.”

Elaine recalls, “Bruce was always very inventive and creative. His whole dissertation was something quite innovative that let him do stuff that nobody had done before. He created beautiful work.”

Elaine took away the chains from my mind.

— Bruce Gooch, Founder, Expressive Computer Graphics

Bruce took this encouragement and ran with it, co-authoring a paper on the fundamental shading algorithms in computer science. Prior to the paper, there were only three such algorithms. “Now there’s a fourth,” says Bruce. “It’s called Gooch Shading.”

He even wrote and published the first book in the field of non-photorealistic rendering — an area he helped discover — while he was a grad student, and he has become one of its top voices.

“Elaine let me know that I could do something that I could barely imagine doing—this thing that students just don’t do. My book was published at the same time and by the same company as her book. Students aren’t supposed to do this stuff!”

Because she developed a trust and respect with Bruce, friendship grew between them.

“I think that’s part of being a mentor, coaching people to understand that they can cope with whatever life gives you. It’s not easy, but you can do it if you’re passionate enough about what you’re doing.”

Throughout her career, Elaine has watched her students go on to enjoy all kinds of success.“I consider my students my ‘professional children.’ And when they grow into being successful professionals, it feels good.”

Bruce is one of those “children.” Now at Texas A&M, he helps students learn to create games and computer animations. He gives his students the same encouragement that Elaine gave him, with the perspective and experience to back it up.

“I’ve started some companies, and I have software that’s with millions of users. That’s what I’m pushing as ‘possible’ with my students. You can start a company. You can deploy a product. You can do these things that 20 years ago no one could.”

And Bruce is quick to point out how he got where he is: “Elaine encouraged me to do my own thing. She gave me an extreme amount of confidence, and the ability to see possibilities I hadn’t seen before.”


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