The peninsular block

• Northern boundary
  • Kachchh along the Western flank of Aravali Range near Delhi
  • Parallel to Yamuna and Ganga until Rajmahal Hills
  • Ganga delta
• North East
  • Karbi anglong plateau
  • Meghalaya plateau
• West
  • Rajasthan
• Malda fault in Bengal separates North East form Chota Nagpur Plateau
• Ancient Gneiss and Granites
• Since Cambrian period it is standing still except Western coast subject submerged under sea
• Was a part of Indo Australian plate
• Rift valleys
  • Mahanadi Narmada Tapi Satpura
• Relict and residual mountains
  • Aravali Nalla Malla Javadi velikonda palkonda Mahendra Giri
• Most east flowing rivers form deltas before entering Bay of Bengal
  • Mahanadi Krishna Kaveri Godavari

The Peninsular Plateau

• The oldest cratonic block
• Part of Gondwana
• Have features dating back to Archean times
• Plateau remained above sea-level since Pre-cambrian times
• Since then is eroded and denuded with low lying hills, hard resisting rocks
• Average elevation - 900m
• Peninsular Plateau is like Block Mountain and may be referred to as an uplifted horst
• Old cratonic block of Archaean times
• Formed by fusing numerous microcontinents
• 3 Main Proto-Continent collision - Aravali, Dharwad, Singbhum
• The Fusion is along Narmada--Godavari--Son lineament
• The remnants of the Proto-Continent - Relicts of fold mountains and shields like Aravali fold mountain with Mewar highlands
  • E Rajasthan highlands
  • Mahabharat plateau
  • Madhya Bharat Pathar

According to Chatterjee PP can be divided into following Meso- Regions

1. North Central Highlands
2. South Central Highlands
3. North Deccan
4. South Deccan
5. Eastern Ghats
6. Western Ghats
7. Eastern Plateau
8. Coastal Plains
9. Meghalaya-Mikir Uplands

North Central Highlands