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Global Geological And Climatic Events

Delhi Morphological Ridge

Why in the News?

The Delhi government has decided to declare 41 sq. km of the Southern Ridge as a reserved forest under the Indian Forest Act, 1927, following long-pending directions from the National Green Tribunal (NGT).

Delhi Morphological Ridge

About Delhi Morphological Ridge:

  • The Delhi Ridge is the northern extension of the ancient Aravalli Range, stretching approximately 35 km from Tughlaqabad to Wazirabad, along the Yamuna River.
  • It is composed mainly of quartzite rock, is over 1.5 billion years old, and significantly older than the Himalayas.
  • It functions as Delhi’s green lungs, aiding in carbon sequestration, temperature regulation, and air pollution reduction.
  • It acts as a natural barrier against desert winds from Rajasthan and supports rich biodiversity, making Delhi one of the world’s most bird-rich capitals.
  • It is divided into four zones: Northern Ridge, Central Ridge, South-Central Ridge, and Southern Ridge.
  • Key conservation areas include the Northern Ridge Biodiversity Park and the Asola Bhatti Wildlife Sanctuary.

Land Use Regulation in the Ridge:

  • Although the area shares ecological features with the Delhi Ridge, it is NOT officially notified as forest land, but it enjoys judicial protection.
  • A 1966 directive prohibits any NON-forest use or encroachment without court approval.
  • Any change in land use must be cleared by the Ridge Management Board (RMB) and the Supreme Court-appointed Central Empowered Committee (CEC).
  • The area is mapped using data from the Delhi Forest Department and the 2006 Seismic Zonation Map.
  • Formal notification as a Reserved Forest under the Indian Forest Act, 1927, is pending due to the absence of ground-truthing.
  • In revenue records, it is often marked as “gair mumkin pahad”, meaning uncultivable rocky hill.
  • The terrain is ecologically fragile, with shallow soil and rocky outcrops, making it unsuitable for construction.
[UPSC 2001] The approximate age of the Aravalli range is-

Options: (a) 370 million years (b) 470 million years (c) 570 million years (d) 670 million years

 

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