Peninsular Plateau: Deccan Trap, Malwa & Chhotanagpur

The Peninsular Plateau constitutes the oldest, most stable tectonic block of the Indian subcontinent, originating as an unyielding shield fragment of ancient Gondwanaland. Structurally composed of Archaean crystalline gneisses, schists, and metamorphosed Proterozoic basements, this triangular upland is delineated by the Aravalli Range to the northwest, the Vindhya-Satpura complexes centrally, and the Western and Eastern Ghats along its oceanic flanks. The peninsular mass tilts generally east-southeast, orienting principal river systems toward the Bay of Bengal, except where the Narmada and Tapi rivers traverse linear, fault-bounded rift grabens toward the Arabian Sea. Physiographically, the plateau subdivides into the Central Highlands, the Deccan Plateau, the mineralized Chhotanagpur Plateau, and the detached north-eastern extension of the Shillong Plateau and Karbi Anglong, isolated from the Rajmahal Hills by the down-faulted tectonic Malda Gap.

Distinct geomorphological and volcanic processes formed the plateau's regional terrains. The western sector is dominated by the Deccan Traps, produced during the Late Cretaceous epoch (approximately sixty-six million years ago) through massive fissure flood eruptions as the northward-drifting Indian plate passed over the subterranean Réunion mantle hotspot. Successive layers of tholeiitic basalt established step-like, terraced topography that weathered into fertile, moisture-retentive black regur soil. In the north, the Malwa Plateau rests between the Aravalli and Vindhyan scarps, giving rise to dendritic drainage directed into the Yamuna via the Chambal river system, known for extensive gully erosion and badland ravines. Further east, the Chhotanagpur Plateau features flat-topped lateritic plateaus termed patlands, hosting a distinctive radial drainage network comprising the Damodar, Subarnarekha, and Koel river systems.

The Peninsular Plateau underpins India's agrarian and heavy industrial base: black regur soils support intensive cotton and soybean cultivation across Maharashtra and Madhya Pradesh, while the Damodar and Subarnarekha basins support heavy steel and thermal plants. For candidates appearing in UPSC CSE and SSC examinations, peninsular geomorphology is a premier focus area. Question formats frequently evaluate the petrological characteristics of Dharwar versus Gondwana formations, the tectonic genesis of the Garo-Rajmahal gap, superimposed drainage systems, the altitudinal hierarchy of summits such as Parasnath in Jharkhand and Anamudi in Kerala, and the structural orientation of fault lines regulating westward rift valley drainage.

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#1
The Peninsular Plateau is a remnant of Gondwanaland comprising Archaean crystalline gneisses and granites, tilted east-southeast except for west-flowing Narmada and Tapi rift rivers.
#2
The Deccan Trap formed through late Cretaceous fissure volcanic eruptions (~66 Ma), creating step-like basaltic topography that weathered into fertile black regur soil.
#3
The Malwa Plateau forms a triangular block bounded by the Aravalli and Vindhyan ranges, feeding dendritic drainage networks into the Yamuna river system.
#4
The Chhotanagpur Plateau acts as India's mineral heartland, containing primary Gondwana coal reserves within the faulted Damodar River rift valley.
#5
The Shillong Plateau and Karbi Anglong represent eastward extensions of the Peninsular shield, separated from the Rajmahal Hills by the down-faulted Malda Gap.
#6
The Bundelkhand Gneiss represents some of the oldest exposed continental crust in India, dating back approximately 3.5 billion years to the Archaean era.
#7
The Dandakaranya region across Odisha, Chhattisgarh, and Andhra Pradesh forms a rugged physiographic section drained by the Indravati and Sabari tributaries of the Godavari.
#8
The Damodar Valley Corporation (DVC), modeled on the US Tennessee Valley Authority, was established in 1948 to utilize the mineral-rich Chhotanagpur drainage basin.
#9
Parasnath Peak (1,365 m) in the Giridih district of Jharkhand is the highest summit of the Chhotanagpur Plateau and a primary Jain pilgrimage center.
#10
Dhupgarh (1,350 m) near Pachmarhi in the Mahadeo Hills functions as the highest peak of the Satpura Range and Madhya Pradesh.
#11
The Narmada flows through an asymmetrical tectonic rift valley formed by fault blocks between the Vindhyan Range to the north and the Satpura Range to the south.
#12
The Baghelkhand Plateau, situated east of the Maikal Hills, separates the Son River basin from the southern Mahanadi river headwaters.
#13
The Deccan Plateau is subdivided into three regional sub-provinces: the Maharashtra Plateau (basaltic traps), the Karnataka Plateau (Dharwar schists), and the Telangana Plateau.
#14
The Baba Budan Hills in Karnataka host the Mulayanagiri peak (1,930 m) and extensive banded iron formations that supply the Kudremukh mining region.
#15
The Garo, Khasi, and Jaintia hills of the Meghalaya Plateau contain the world's wettest stations, Mawsynram and Cherrapunji, situated on funneling southern escarpments.

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Educator's Insight

The Peninsular Plateau is India's oldest and most stable landmass, originating as an ancient fragment of Gondwanaland. Composed of tough Archaean granites and gneisses, it slopes gently from west to east, directing most major rivers toward the Bay of Bengal, while the Narmada and Tapi flow westward through tectonic rift valleys. The region features diverse sub-plateaus, from volcanic Deccan basalt that weathered into rich cotton-growing black soil to the mineral-rich Chhotanagpur plateau.

For UPSC and State PSC geography papers, examiners regularly target structural boundaries and river directions. A very popular prelims trap concerns the Shillong and Karbi Anglong plateaus: candidates mistakenly assume they belong to the Himalayas, but they are actually peninsular extensions detached from the Rajmahal Hills by the down-faulted Malda Gap. For revision, remember that the Damodar valley in Chhotanagpur holds India's primary Gondwana coal seams, and Narmada-Tapi flow west without forming deltas.

Peninsular Plateau: Deccan Trap, Malwa & Chhotanagpur

Key Concepts & Self-Assessment15 Key Facts

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