Indus Valley Civilisation — TNPSC Group II/IIA History

Overview

The Indus Valley Civilisation (IVC), also known as the Harappan Civilisation, is one of the world's oldest urban civilizations that flourished in the Indian subcontinent around 2600–1900 BCE. For TNPSC Group II/IIA aspirants, this topic carries significant weightage as it forms the foundation of Indian history and frequently appears in both prelims and mains examinations with questions on urban planning, seals, weights and measures, and archaeological discoveries.

Historical Timeline and Chronology

Phases of Indus Valley Civilisation

Important Dates for Revision

• 2600 BCE: Beginning of Mature Harappan phase (urban civilization peak)
• 1900 BCE: Decline phase commences
• 1925 CE: First systematic excavation by John Marshall
• 1921 CE: Discovery of Mohenjo-daro and Harappa by Indian archaeologists

Geographical Extent and Major Sites

Area Covered

The Indus Valley Civilisation spread across approximately 1,260,000 square kilometers, covering parts of modern-day:

• Pakistan (Sindh and Punjab provinces)
• India (Gujarat, Haryana, Punjab, Rajasthan, and Uttar Pradesh)
• Smaller presence in Afghanistan and Iran borders

Major Archaeological Sites

Tamil Nadu Connection

While Tamil Nadu was not directly part of IVC, maritime trade connections existed with southern Indian settlements during the same period. Potential trade routes through the coastal regions suggest indirect influence on early Tamil culture.

Urban Planning and Architecture

Town Planning Features

The Indus Valley Civilisation is renowned for its sophisticated urban planning:

1. Grid Pattern Layout: Cities were planned on a grid system with main streets running north-south and east-west 2. Drainage System: Underground brick drains ran beneath streets and connected to larger main drains 3. Citadel and Lower Town: Cities were divided into elevated citadel areas and lower residential zones 4. Building Standards: Houses built with standardized burnt bricks (typically 1:2:4 ratio of length:width:height) 5. Public Buildings: Evidence of granaries, baths, and community structures

Key Architectural Structures

Great Bath at Mohenjo-daro

• Dimensions: 12 × 7 × 2.4 meters
• Purpose: Likely used for religious rituals or public bathing
• Construction: Lined with terracotta and bitumen for waterproofing

Granaries

• Found at Harappa and Mohenjo-daro
• Suggests organized agriculture and food storage systems
• Evidence of administrative control over surplus production

Economy and Trade

Agricultural Base

• Crops grown: Wheat, barley, peas, sesame, cotton
• Domesticated animals: Cattle, buffalo, sheep, goats, pigs, horses (debated)
• Seasonal rivers (Indus and its tributaries) provided irrigation

Weights and Measures

• Standardized weights in hexahedral (16 weights) and decimal (10 weights) systems
• Suggests regulated commerce and measurement standards
• Indicates advanced mathematical knowledge

Internal Trade

• Exchange of goods between cities through organized routes
• Pottery, beads, shells, metals, and agricultural products
• Evidence of market regulation and standardized pricing

External Trade

• Trade with Mesopotamia (present-day Iraq): Seals and weights found at Ur and Lagash
• Trade with Persian Gulf regions, Central Asia, and possibly Egypt
• Evidence of merchant ships and maritime networks
• Exchange of lapis lazuli, turquoise, and semi-precious stones

Script and Language

Indus Script Characteristics

• Number of signs: Approximately 400–600 distinct symbols
• Direction: Usually written right to left
• Nature: Combination of pictographic and alphabetic elements
• Status: Undeciphered — remains one of archaeology's greatest unsolved mysteries

Known Information

• Script appears on seals, pottery, and copper tablets
• Brief inscriptions (usually 4–5 characters) suggest proto-writing
• No bilingual texts found to help decipher (unlike Rosetta Stone)

Language Theories

• Some scholars propose Dravidian language connections
• Others suggest proto-Indo-European links
• Recent AI and computational studies ongoing

Seals and Religious Beliefs

Indus Seals

• Material: Steatite stone (soapstone)
• Size: Typically 2–2.5 cm square
• Purpose: Trade seals, religious symbols, administrative marks
• Designs: Animals (cattle, buffalo, rhinoceros, tiger), geometric patterns, script

Significant Seal: Pashupati Seal

• Depicts a figure in yoga-like posture surrounded by animals
• Interpreted as proto-Shiva or early form of Hindu deity worship
• Suggests continuity with later Vedic religious traditions

Religious and Spiritual Evidence

• Fire altars found at Kalibangan suggest ritual practices
• Terracotta figurines of female forms (fertility goddesses)
• No evidence of large temples or organized priesthood
• Decentralized religious practices likely

Social Organization

Occupational Structure

• Administrators: Likely ruled from citadels
• Merchants and Traders: Managed commerce and external trade
• Artisans: Craftspeople, seal makers, bead manufacturers, metalworkers
• Farmers: Majority population engaged in agriculture
• Laborers: Construction and maintenance workers

Absence of War Evidence

• No evidence of large-scale warfare or weapons
• Fortifications served defensive and administrative purposes
• Relatively peaceful civilization compared to contemporary societies

Social Equality

• Relatively uniform housing standards across settlements
• Less evidence of extreme wealth disparity
• Suggests more egalitarian social structure than contemporary civilizations

Technology and Craftsmanship

Metalworking

• Bronze, copper, and tin metallurgy well-developed
• Production of tools, weapons, and ornaments
• Evidence of smelting workshops

Pottery

• Wheel-made ceramics with distinctive designs
• Painted motifs of plants and animals
• Standardized shapes for storage and trade

Bead Manufacturing

• Extensive bead production at sites like Chanhudaro
• Used semi-precious stones: carnelian, agate, lapis lazuli
• Beads exported to Mesopotamia and distant regions

Textile Production

• Evidence of cotton cultivation and weaving
• Spindle whorls found in excavations
• Cotton likely exported to Mesopotamia

Decline and Disappearance

Theories for Decline

1. Environmental Factors

• Change in monsoon patterns causing drought
• Tectonic activity altering river courses
• Deforestation reducing timber and food resources

2. **Natural