RAS question
Deccan Trap rocks in Rajasthan are found in:
Correct answer: (C) Southern Hadoti (Jhalawar, Baran).
In Rajasthan, Deccan Trap rocks are found in the southern Hadoti belt, especially Jhalawar and Baran.
Explanation
Deccan Trap rocks are basaltic rocks, and in Rajasthan their exam-relevant occurrence is in the south-eastern part of the state. The Central Ground Water Board's groundwater report places the Deccan Traps in Rajasthan's south-eastern segment and specifically includes Baran and Jhalawar among the districts where they occur. In standard RAS framing, this is southern Hadoti: the basaltic Deccan Trap extension enters Rajasthan from Madhya Pradesh into the Jhalawar-Baran side and is associated with the black soil region. The Aravalli, northern plains and western Rajasthan are broad physiographic zones, while the south-eastern Hadoti tract is where these basaltic lava rocks are actually mapped.
Why the other options are wrong
- (A) The Aravalli region is not the Deccan Trap belt; it is identified with metamorphic rocks, while the trap rocks in southern Hadoti are basaltic.
- (B) The Northern Plains are alluvial, so they do not match Rajasthan's basaltic Deccan Trap occurrence.
- (D) Western Rajasthan is associated with sandstone, whereas the Central Ground Water Board places Deccan Traps in the south-eastern segment including Baran and Jhalawar.
Concept
Rajasthan's physiographic and geological regions are closely linked to rock type and regional location. RAS repeats such questions because mineral, soil and landform patterns in Rajasthan are best understood through these geological belts.