Which of the following are the oldest folded mountain in India?
Aravalli Range
Identifying the Oldest Folded Mountain in India
The question asks to identify the oldest folded mountain range located in India from the given options. Understanding the geological age and formation process of different mountain ranges in India is key to answering this question.
What are Folded Mountains?
Folded mountains are created when two or more of Earth's tectonic plates are pushed together. This immense pressure causes the layers of rock and sediment between them to buckle and fold, much like pushing the ends of a rug together.
Analyzing the Options
Let's look at the characteristics of each mountain range listed:
- Aravalli Range: This range runs through Rajasthan, Haryana, Delhi, and Gujarat. Geologically, it is one of the oldest mountain ranges not just in India but in the world. It was formed during the Proterozoic Eon, which is billions of years ago, through continental collision. Over millions of years, it has been highly eroded and now appears as a series of residual mountains. These are indeed remnants of a very old folded mountain system.
- Vindhya Range: Located in central India, the Vindhya Range is primarily known as an escarpment or a chain of hills formed by the uplift or tilting of the Deccan Plateau's northern edge. While ancient, its formation is different from the typical intense folding seen in younger mountain belts like the Himalayas or the ancient folding of the Aravallis.
- Satpura Range: Also located in central India, south of the Vindhya Range, the Satpura Range is often described as a block mountain range. It was formed due to faulting and block uplift. Like the Vindhyas, it is ancient but not considered the oldest classic folded mountain system in India in the same way as the Aravallis.
- Himalayan Range: Located along the northern border of India, the Himalayas are the world's highest mountain range. They were formed very recently in geological terms (beginning about 50 million years ago) due to the collision of the Indian Plate with the Eurasian Plate. They are a classic example of young folded mountains, still actively rising.
Conclusion on the Oldest Folded Mountain
Comparing the geological ages and formation types, the Aravalli Range stands out as the oldest among the options and is recognized as the oldest folded mountain range in India. While other ranges are also ancient, the Aravallis represent the highly eroded remnants of a very early mountain-building event involving intense folding.
| Mountain Range | Primary Type/Age | Location |
|---|---|---|
| Aravalli Range | Old Folded (Residual) / Proterozoic (Oldest) | Rajasthan, Haryana, Delhi, Gujarat |
| Vindhya Range | Escarpment / Ancient (Older than Himalayas) | Central India |
| Satpura Range | Block Mountain / Ancient (Older than Himalayas) | Central India |
| Himalayan Range | Young Folded / Cenozoic (Youngest) | Northern India |
Based on this analysis, the Aravalli Range is the oldest folded mountain in India.
Revision Table: Indian Mountain Ranges
| Mountain Range | Age Classification | Formation Type | Current Form |
|---|---|---|---|
| Aravalli Range | Oldest | Folded Mountains (formed during orogeny) | Residual Hills (due to erosion) |
| Vindhya Range | Ancient | Uplifted Block/Escarpment | Plateau Edge/Hills |
| Satpura Range | Ancient | Block Mountains (Fault-block) | Ridges and Plateaus |
| Himalayan Range | Youngest | Folded Mountains (collision of plates) | High Peaks (still rising) |
Additional Information: Geology of Oldest Indian Mountains
The Aravalli Range represents a very significant geological event in the history of the Indian subcontinent. Its formation is linked to an ancient collision event that occurred when continental masses came together during the Precambrian era, specifically the Proterozoic Eon (roughly 2.5 billion to 541 million years ago). This process, known as orogeny or mountain building, created a massive mountain belt. Over vast geological timescales, forces of erosion (wind, water) have worn down these mountains significantly, leaving behind the present-day Aravalli hills, which are considered residual mountains, meaning they are the remnants of much larger, older structures. Their rocks are some of the oldest on the planet, containing evidence of these early tectonic activities. Understanding the Aravallis helps geologists study the early stages of Earth's crustal development and continental formation.
Important Questions from Location(s)
_______is the oldest mountain range in the Indian subcontinent.
Which of the following is a unique feature of the Barren Islands?
Which of the following hill stations is located in the Middle Himalayas?
The swampy belt of the northern Indian plains is known as ________
The northern most range of the Himalayan mountain is known as:
