The Aravalli Hills, among the world’s oldest mountain systems, form a 700‑km ecological spine running from Gujarat to Delhi and shaping the climate, water, and air quality of North India. Recent Supreme Court directions on how to define and regulate the Aravallis have sparked a national debate on whether the region is moving towards sustainable protection or bigger ecological risk. Aravalli Hills How Old Are the Aravalli Hills? Precambrian origins The Aravallis are Precambrian fold mountains, with major tectonic events dated roughly 1.8–2 billion years ago, making them far older than the Himalayas. Their evolution involved collisions and suturing between ancient cratonic blocks, followed by multiple cycles of uplift, erosion, and rifting over geological time. From towering peaks to eroded ridges Continuous weathering and erosion have reduced the once high chain to today’s modest ridges, plateaus, and isolated hillocks scattered across Rajasthan, Haryana, and Delhi. This long hist...
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