Match List I with List II and select the correct answer using the code given below the Lists : List-I (Land from of peninsular India A. Marwarupland B. Bundelkhand C. Meghalaya upland D. Maharashtra plateau List-II (Predominat rock) 1. Quartzites Shalea, Schists 2. Sandstone Shale, upland Limestone 3. Granite and Gneiss 4. Basalt Code: A B C D

1. The Indian Geological Time Scale (basic)

To understand the ground we stand on in India, we must look at the Indian Geological Time Scale. Unlike the standard international scale, Indian geology is traditionally categorized into four distinct eras based on major tectonic and evolutionary events. This classification, popularized by Sir T.H. Holland, spans from the Archaean (the oldest, billions of years old) to the Quaternary (the youngest, including current river deposits) Geography of India, Physiography, p.49. Understanding this sequence is vital because it explains why coal is found in Jharkhand while marble is found in Rajasthan. Starting from the base, the Archaean Group consists of highly metamorphosed rocks. This includes the Archaean Gneiss (the foundation of the Peninsula) and the Dharwar System. The Dharwar rocks are particularly significant for India's economy as they are the source of high-grade iron ore, gold (Kolar), and manganese Geography of India, Physiography, p.50. Following these are the Puranic Systems, specifically the Vindhyan System. These rocks are famous for being "unfossiliferous" (lacking fossils) but rich in high-quality building stones like red sandstone—the very material used to build the Red Fort and Sanchi Stupa Geography of India, Geological Structure and formation of India, p.14.

Rock System	Era	Key Features
Archaean/Dharwar	Archaean	Highly metallic; oldest metamorphosed sediments.
Cuddapah/Vindhyan	Puranic	Sedimentary; famous for diamonds and building stones.
Gondwana	Aryan	The primary source of India's coal (98%).
Deccan Traps	Aryan	Basaltic lava flows forming the black cotton soil.

Finally, the Aryan Group is the most diverse. It witnessed the breakup of the Gondwana supercontinent, the massive volcanic eruptions that created the Deccan Traps in Maharashtra, and the eventual rise of the Himalayas. This era represents the transition from the ancient shield to the modern geography we recognize today.

Sources: Geography of India, Physiography, p.49; Geography of India, Physiography, p.50; Geography of India, Geological Structure and formation of India, p.14

2. Archaean Rock System: Gneiss and Schists (basic)

To understand the geology of India, we must start at the very beginning—the Archaean Rock System. These are the oldest rocks in the Earth's crust, formed over 4 billion years ago during the cooling of the planet's molten surface. In India, they form the Basement Complex, acting as the foundation upon which all other geological layers were later built. Because they formed before life existed, these rocks are Azoic (devoid of fossils) and are primarily crystalline in nature, having been subjected to intense heat and pressure over eons.

The two primary rock types you will encounter here are Gneiss and Schist. While both are metamorphic rocks, they look and behave differently. Gneiss is a high-grade metamorphic rock characterized by distinct "banding" (layers of different minerals), while Schist is more "foliated," meaning it has thin, leaf-like layers that allow it to split easily. These rocks cover more than two-thirds of the Indian Peninsula, stretching from the Aravallis in the west to the Meghalaya Plateau in the east Geography of India, Physiography, p.50.

In the Indian context, the Archaean Gneissic system is typically divided into three distinct groups based on their location and physical characteristics:

System Name	Key Characteristics	Major Locations
Bengal Gneiss	Highly foliated (layered); includes Khondolites (named after the Khond tribes).	Eastern Ghats, Odisha, Jharkhand, and the Meghalaya Plateau Geography of India, Geological Structure and formation of India, p.4.
Bundelkhand Gneiss	Massive and coarse-grained; looks like granite. It is famously criss-crossed by quartz veins.	Bundelkhand (UP/MP), Rajasthan, and parts of Andhra Pradesh Geography of India, Geological Structure and formation of India, p.6.
Nilgiri Gneiss	Dark-colored, massive, and eruptive in nature (often called Charnockites).	South India (Nilgiri Hills), Palni, and Shevaroy hills Geography of India, Geological Structure and formation of India, p.6.

These rocks are of immense economic importance because they are the storehouse of India's metallic minerals, including iron, copper, and manganese, as well as precious stones and high-quality building materials Geography of India, Physiography, p.50.

Sources: Geography of India, Geological Structure and formation of India, p.4; Geography of India, Geological Structure and formation of India, p.5; Geography of India, Geological Structure and formation of India, p.6; Geography of India, Physiography, p.50

3. Dharwar and Vindhyan Sedimentary Systems (intermediate)

After the formation of the ancient Archaean basement, India witnessed the birth of its first sedimentary cycles. The Dharwar System (approx. 2500 to 1800 million years ago) represents the first metamorphosed sedimentary rocks in India. These rocks were formed from the debris of the even older Archaean Gneisses and Schists. While they originated as sediments, intense tectonic activity has metamorphosed them into schists, quartzites, and marbles. Economically, the Dharwar system is the "backbone" of India’s mineral wealth, containing vast reserves of iron ore, manganese, gold, and copper Geography of India, Majid Husain, p.7.

The Dharwar system is not a single block but exists in scattered patches across the peninsula. For instance, the Rialo Series (also known as the Delhi Series) stretches from Delhi to Alwar and is world-renowned for its high-quality Makrana marbles. In central India, we find the Sausar Series (Nagpur/Chhindwara) and the Sakoli Series (Jabalpur/Rewa), which are rich in mica, manganese, and superior marbles Geography of India, Majid Husain, p.11. These rocks also form the core of the Meghalaya Upland, linking the northeast geologically to the main Peninsular block.

Moving forward in time, we encounter the Vindhyan System. Unlike the Dharwar system, these are largely unmetamorphosed sedimentary rocks consisting of sandstones, shales, and limestones. This system is famous for providing the red sandstone used in India’s most iconic historical monuments, such as the Red Fort, Qutub Minar, and the Sanchi Stupa Geography of India, Majid Husain, p.13. The system is divided into several series, including the Kaimur, Rewa, and Bhander series. A unique feature of the Vindhyan system is the presence of diamond-bearing horizons, specifically in the Bijawar series (Panna in MP) and the Golconda region Geography of India, Majid Husain, p.14.

Feature	Dharwar System	Vindhyan System
Nature	Highly metamorphosed sedimentary	Mostly unmetamorphosed sedimentary
Economic Value	Metallic minerals (Iron, Gold, Manganese)	Building stones, Diamonds, Limestone
Key Locations	Karnataka, Aravallis, Chotanagpur	Vindhyan Ranges, MP, Eastern Rajasthan

Sources: Geography of India, Geological Structure and formation of India, p.7; Geography of India, Geological Structure and formation of India, p.11; Geography of India, Geological Structure and formation of India, p.13; Geography of India, Geological Structure and formation of India, p.14

4. The Deccan Traps and Basaltic Volcanism (intermediate)

Concept: The Deccan Traps and Basaltic Volcanism

5. Physiography of the Central Highlands (intermediate)

The Central Highlands constitute the northern wing of the Peninsular Plateau, serving as a geological bridge between the Great Plains of the North and the Deccan Plateau of the South. Geographically, this region lies north of the Narmada River and encompasses a major portion of the Malwa Plateau NCERT Class IX, Physical Features of India, p.12. It is bounded by the ancient, highly denuded Aravalli Range to the northwest and the Vindhyan Range to the south. Unlike the relatively uniform basaltic cover of the Deccan, the Central Highlands are a complex mosaic of diverse rock systems, ranging from the oldest Precambrian crystalline rocks to younger sedimentary formations. To understand the "personality" of the Central Highlands, we must look at its four major sub-regions:

• The Aravallis: One of the world's oldest fold mountain systems, composed mainly of quartzites, gneisses, and schists from the Precambrian period Majid Husain, Physiography, p.54.
• The Malwa Plateau: A rolling landscape bordered by the Aravallis and Vindhyans, characterized by broad valleys and rounded hills.
• The Bundelkhand Upland: This region is defined by the Bundelkhand Gneiss, an ancient, coarse-grained crystalline rock resembling granite, often intersected by prominent quartz veins Majid Husain, Geological Structure and formation of India, p.6.
• The Vindhyan Range: Primarily composed of sedimentary rocks like sandstones, shales, and limestones, which form prominent escarpments.

Region	Primary Rock Type	Geological Significance
Aravallis	Quartzites & Schists	Remnants of ancient fold mountains; highly denuded.
Bundelkhand	Bundelkhand Gneiss	One of the oldest granitic cores of the Indian Shield.
Vindhyans	Sandstone & Limestone	Separated from Aravallis by the Great Boundary Fault (GBF).

Sources: CONTEMPORARY INDIA-I, Geography, Class IX. NCERT(Revised ed 2025), Physical Features of India, p.12; Geography of India, Majid Husain (McGrawHill 9th ed.), Physiography, p.54; Geography of India, Majid Husain (McGrawHill 9th ed.), Geological Structure and formation of India, p.6

6. The Meghalaya Plateau: A Peninsular Outlier (exam-level)

The Meghalaya Plateau (also known as the Shillong Plateau) is a geological 'outlier' of the Indian Peninsular Block. Although it is physically located in the Northeast, separated from the mainland by the massive plains of Bangladesh and West Bengal, its 'DNA' is identical to the ancient rocks of South India. This plateau, along with the Karbi Anglong hills in Assam, represents an eastern extension of the Peninsular Shield NCERT Class XI, Structure and Physiography, p.8.

The separation of this plateau from the main block occurred during the Himalayan orogeny. As the Indian Plate moved northeastward, the intense tectonic forces created a massive structural depression or fault between the Rajmahal Hills (in Jharkhand) and the Meghalaya Plateau. This feature is known as the Malda Fault or the Rajmahal-Garo Gap NCERT Class XI, Structure and Physiography, p.13. Over millions of years, this deep depression was filled by the sediment deposition of the Ganga and Brahmaputra rivers, leaving the Meghalaya Plateau standing as an isolated upland.

Geologically, the plateau is composed of some of the oldest rocks on Earth. It contains an Archaean basement complex of gneisses and granites, overlaid by the Dharwar System—the first metamorphosed sedimentary rocks in India, dating back 2500 to 1800 million years Majid Husain, Geological Structure and formation of India, p.7. These rocks, including quartzites, shales, and schists, are also found in the Chotanagpur Plateau and Karnataka, proving their shared origin. To better understand the diversity of the Peninsular uplands, consider this comparison:

Upland Region	Dominant Geological Composition
Meghalaya Plateau	Ancient Dharwar system (Quartzites, Schists, Shales)
Bundelkhand Upland	Ancient Bundelkhand Gneiss (Granite-like)
Maharashtra Plateau	Basaltic Lava (Deccan Traps)
Marwar Upland	Vindhyan Sandstone, Shale, and Limestone

The plateau is regionally sub-divided into three major hill ranges based on the tribal groups inhabiting them: the Garo Hills in the west, the Khasi Hills in the center, and the Jaintia Hills in the east NCERT Class XI, Structure and Physiography, p.13.

Sources: INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Structure and Physiography, p.8, 13; Geography of India, Majid Husain (McGrawHill 9th ed.), Geological Structure and formation of India, p.6-7

7. Mapping Landforms to Predominant Rocks (exam-level)

To understand the physical personality of India, we must look beneath the surface. The landscape is essentially a 'lithological map' come to life; the hills, plateaus, and plains we see today are the direct result of the underlying rock types and their resistance to erosion. In the Indian Peninsula, this relationship is particularly striking because we have a mix of the world’s oldest crystalline basements, ancient sedimentary basins, and massive volcanic flood basalts. Let’s look at four distinct regions that illustrate this perfectly:

• The Bundelkhand Upland: Located in northern Madhya Pradesh and southern UP, this region is a window into the Earth's deep past. It is dominated by the Bundelkhand Gneiss, a massive granitoid rock of the Archaean age. If you were to walk across this landscape, you would see a coarse-grained rock that looks like granite, famously criss-crossed by prominent quartz veins that stand out like ribs across the terrain Geography of India, Geological Structure and formation of India, p.5-6.
• The Marwar Upland: Moving west into Rajasthan, the geology shifts to the Vindhyan system. Here, the landscape is built from layers of sandstone, shale, and limestone. These sedimentary rocks are the reason why this region has historically been a primary source of high-quality building stone (like the red sandstone used in India’s famous forts).
• The Maharashtra Plateau: This is the heart of the Deccan Traps. Formed during the Cretaceous-Eocene period, the land was smothered by successive flows of basaltic lava. This creates a 'step-like' topography (traps) and weathers into the fertile black cotton soil (Regur) Geography of India, Geological Structure and formation of India, p.6.
• The Meghalaya Plateau: Though geographically separated from the main Peninsula by the Malda Gap, this is a geological extension of the same ancient block. It consists of Archaean quartzites, shales, and schists. Because this area receives some of the highest rainfall in the world, the surface is highly eroded, often exposing the bare, ancient rocky basement INDIA PHYSICAL ENVIRONMENT, Structure and Physiography, p.13.

Landform Region	Predominant Rock Type	Geological Period/System
Bundelkhand Upland	Gneiss / Granitoid with Quartz veins	Archaean
Marwar Upland	Sandstone, Shale, Limestone	Vindhyan
Maharashtra Plateau	Basalt (Lava flows)	Deccan Trap (Cretaceous)
Meghalaya Plateau	Quartzites, Schists, Crystalline rocks	Archaean / Dharwar extension

Sources: Geography of India, Geological Structure and formation of India, p.5-6; INDIA PHYSICAL ENVIRONMENT, Structure and Physiography, p.13

8. Solving the Original PYQ (exam-level)

This question is a brilliant application of the Geological Structure of India module you just completed. To solve this, you must synthesize your knowledge of lithology (rock types) with the physiographic regions of the Peninsular Plateau. The Maharashtra Plateau serves as your strongest anchor point; as a core part of the Deccan Traps, it is definitively composed of Basaltic lava (D-4). Once you establish this link, you immediately narrow your choices down to (A) and (B). From here, the Bundelkhand Upland provides the next clue—it is famous for some of the oldest rocks in India, specifically the Bundelkhand Gneiss (B-3), a coarse-grained ancient crystalline rock.

Walking through the remaining matches, the Marwar Upland represents the Vindhyan system, which you learned is the primary source of Sandstone, Shale, and Limestone (A-2) used in India's historical monuments. Finally, the Meghalaya Upland (the Shillong Plateau) is a detached extension of the Peninsular block, containing highly metamorphosed Quartzites, Shales, and Schists (C-1) belonging to the Dharwar and Archaean systems. This systematic correlation leads you to the correct sequence: 2-3-1-4, which is Option (A).

A common trap UPSC uses here, seen in options (C) and (D), is assigning Basalt to the Marwar Upland. This preys on students who incorrectly assume that all "uplands" or "plateaus" in the Peninsula are volcanic in origin. Additionally, the examiners test your ability to distinguish between different Archaean-era rocks; while both Bundelkhand and Meghalaya have ancient crystalline bases, the specific term Gneiss is the geological signature of Bundelkhand. As emphasized in Geography of India by Majid Husain, identifying these regional lithological signatures is the most efficient way to navigate complex match-the-following questions.