Phases of Evolution of Harappan Civilisation
Master the evolutionary trajectory of the Indus Valley Civilisation, detailing the Pre-Harappan village cultures, Early Harappan proto-urban transitions, Mature Harappan peak urbanization, and Late Harappan post-urban rural adaptations for UPSC GS-1.
1. The Early Harappan Phase (c. 3300 BCE – 2600 BCE)
The Early Harappan phase represents the formative, proto-urban stage of the civilization. It is characterized by the consolidation of agricultural village economies, early metallurgy, and regional trade connections. It is also known as the Regionalisation Era.
The earliest prelude is the Hakra Ware Phase (c. 3800-3200 BCE), identified in the Ghaggar-Hakra valley (e.g., Bhirrana, Kunal). It is followed by the Ravi Phase (c. 3300-2800 BCE) at Harappa, marked by early wheel-made pottery, script-like graffiti, and bead making.
- Fortifications: Defensive walls at Kot Diji and Kalibangan protecting settlements.
- Standardization: Emergence of uniform pottery styles (Kot Diji style) and early brick ratios (1:2:3 or 1:2:4).
- Specialization: Early metal works (bronze and copper) and shell manufacturing.
Key Sites and Features:
| Site |
Key Early Harappan Evidence |
| Bhirrana |
Oldest Harappan site yielding Hakra Ware, animal bones, and early multi-room houses. |
| Kot Diji |
Massive defensive wall, wheel-made pottery with horned deity motifs, and a destruction layer indicating transition. |
| Kalibangan |
A distinct pre-Harappan agricultural field showing criss-cross ploughed furrows. |
| Kunal |
Pre-Harappan silver crowns and necklaces, indicating early social stratification. |
2. The Mature Harappan Phase (c. 2600 BCE – 1900 BCE)
The Mature Harappan phase represents the zenith of Indus Valley urbanization. Known as the Integration Era, it is marked by complete administrative cohesion, advanced civic planning, standardized technologies, and extensive trade.
- Grid-Planned Settlements: Main streets running north-south and east-west, intersecting at right angles (grid pattern).
- Sanitation: Underground covered drains, soakage jars, and private toilets in homes.
- Double Division: Separation into a raised **Citadel** (administrative/religious buildings) and a **Lower Town** (residential quarters).
Standardized weight system using binary values (1, 2, 4, 8, 16, 32...) for lower weights and decimal values for higher weights. The ratio of bricks was strictly fixed at 1:2:4 (height:width:length) for all civic structures. Steatite seals and a yet-undeciphered script were used to authenticate commercial shipments to Mesopotamia.
Principal Urban Centers:
- Harappa & Mohenjo-daro: Large dual metropolises of the Indus basin, showing granaries, citadel structures, and standard modular layout.
- Rakhigarhi (Haryana): The largest Harappan site in terms of geographic area, serving as a major Ghaggar basin trade hub.
- Dholavira (Kutch): Three-tier division (Citadel, Middle Town, Lower Town) and advanced stone water reservoirs.
- Lothal (Gujarat): Artificial dockyard connected to the Sabarmati river, bead factory, and double burials.
3. The Late Harappan Phase (c. 1900 BCE – 1300 BCE)
The Late Harappan phase is a period of de-urbanization, civic decay, and regional fragmentation. Known as the Localisation Era, it represents the decline of central administrative systems and a shift back to localized, rural agricultural communities.
- Loss of Standards: Abandonment of grid plans; houses built of reused bricks in a haphazard layout.
- Disappearance of Tech: The script, steatite seals, and uniform cubical weights fell out of use.
- Rural Shift: Abandonment of great metropolises; population shifted towards small agrarian villages.
As integration broke down, distinct regional styles emerged in pottery and burials:
• Cemetery H Culture: Located in Punjab, showing painted urn burials.
• Jhukar Culture: Located in Sindh, showing painted pottery and round button seals.
• Lustrous Red Ware: Located in Gujarat (Rangpur, Rojdi).
Decline Dynamics & Outposts:
- Daimabad (Maharashtra): The southernmost Late Harappan outpost, famous for yielding the Daimabad Bronzes (chariot, bull, elephant).
- Alamgirpur & Hulas (UP): The easternmost outposts, showing late phase village cultures with lack of drainage.
- Bhagwanpura (Haryana): A key site showing a stratigraphic overlap between Late Harappan levels and the early Painted Grey Ware (PGW) culture.
The Evolutionary Horizon of Harappan Civilisation
- c. 3300 BCE – 2600 BCE — Pre & Early Harappan Phase: <strong>Emergence & Foundation</strong>: Gradual transition from Neolithic Mehrgarh to sedentary chalcolithic pastoralist villages.<br><br><strong>Key Characteristics</strong>: Emergence of defensive fortifications, specialized crafts (bead-making, metalworking), standardization of wheel-made pottery (Hakra and Ravi ware), and localized trade networks. Significant sites include Kot Diji, Kalibangan, Amri, and Bhirrana.
- c. 2600 BCE – 1900 BCE — Mature Harappan Phase: <strong>Urban Revolution</strong>: Complete consolidation of pan-regional integration, civic planning, and trade surplus.<br><br><strong>Key Characteristics</strong>: Standardized grid-planned cities, monumental baked-brick structures (Great Bath, Granaries), advanced drainage systems, writing/script, uniform weights and measures (16-binary system), long-distance trade with Mesopotamia (Meluhha trade), and high-quality bronze/steatite art. Core sites: Harappa, Mohenjo-daro, Rakhigarhi, Dholavira, and Lothal.
- c. 1900 BCE – 1300 BCE — Late Harappan Phase: <strong>Post-Urban Regression</strong>: Civic decay, de-urbanization, and regional fragmentation.<br><br><strong>Key Characteristics</strong>: Loss of systemic standardization (script, seal, weights), disappearance of long-distance foreign trade, replacement of large cities by small farming hamlets. Localized ceramic adaptations emerge, such as the Cemetery H, Jhukar, and Lustrous Red Ware cultures. Sites include Jhukar, Rangpur, Rojdi, and Daimabad.
Key Questions & Answers
- What is the oldest Harappan site according to the Archaeological Survey of India (ASI)?
- Bhirrana in Haryana. It yields early Hakra Ware levels dating back to c. 7500 BCE.
- Which Early Harappan site shows a destruction layer by fire prior to its Mature rebuild?
- Kot Diji in Sindh. A massive fire layer separates the Early Harappan Kot Dijian phase from the subsequent Mature Harappan occupation.
- In which phase does the Harappan script make its first organized appearance?
- The Early Harappan Phase (specifically during the Ravi Phase, c. 3300-2800 BCE, as potters' marks/graffiti).
- What standard unit of weight was the basis for the Harappan commercial ratio?
- The binary weight unit of 16 (representing 13.63 grams) was the base unit for small transactions.
- Name the unique Late Harappan outpost situated in Maharashtra.
- Daimabad on the Pravara River. It yielded the famous Daimabad Bronzes (a chariot driver, bull, elephant, and rhino).
- At which site is there a stratigraphic overlap of Late Harappan and PGW (Vedic) culture?
- Bhagwanpura in Haryana. It shows a continuous, overlapping habitation of Late Harappans and Painted Grey Ware (PGW) users.
Memory Aids
- Mnemonic 1: Early Harappan Fortified Sites: **K**ot Diji, **B**anawali, **A**mri, and **K**alibangan (**KBAK**) represent the major Early Harappan sites that developed early fortifications, paving the way for Mature urbanization.
- Mnemonic 2: Late Harappan Regional Sub-Cultures: **J**hukar Culture (Sindh), **C**emetery H (Punjab), and **L**ustrous Red Ware (Gujarat) (**JCL**) represent the distinct regional cultures of the Late Harappan post-urban phase.
- Mnemonic 3: Mature Harappan Metropolises: **H**arappa, **M**ohenjo-daro, **R**akhigarhi, **D**holavira, and **L**othal (**HMRDL**) are the five principal mature metropolises showing high-order civic planning and monumental structures.
Common Exam Traps
- Trap 1: The 'Sudden Birth' Fallacy: UPSC statements may claim the Harappan Civilisation sprang up suddenly without local roots. **False.** It was a gradual, indigenous evolution from Neolithic pastoral communities (like Mehrgarh) to Early Harappan chalcolithic stages, before maturing into planned urban centers.
- Trap 2: Mixing Site Phase Exclusivity: Do not assume a site belonged to only one phase. Sites like **Dholavira, Rakhigarhi, Kalibangan, Harappa, and Mohenjo-daro** show continuous occupation across all three phases (Early, Mature, and Late), whereas sites like Kot Diji (mostly Early) or Jhukar (purely Late) are specific phase markers.
- Trap 3: Iron & Metallurgy Misconceptions: Do not confuse late-phase bronze and copper technology with Iron. The entire Harappan trajectory (including Late Harappan) was **strictly pre-Iron**; iron makes its appearance in India much later during the Late Vedic period (c. 1000 BCE).
- Trap 4: The 'Decline' vs 'Extinction' Trap: The Late Harappan phase represents the **decline of urban infrastructure (de-urbanization)**, not the complete extinction of the population. People migrated eastward and southward, reverting to rural agricultural lives.