Question.
What are " Truncated Spurs"? Where and how are they formed?
(UPSC Geography Optional 2024; NCERT Class XI-Geography-Chapter 6)
Answer.
Truncated spurs are steep cliff-like edges or ridges found on the sides of U-shaped glacial valleys. They are formed when interlocking spurs (natural ridges of land extending into a valley) are cut off or truncated by the erosive action of a glacier.
Location:
Truncated Spurs are commonly found in regions where glaciation occurs.
They are commonly triangular-shaped and found between Hanging Valleys.
They are mainly found in U-shaped valleys of the Alps, the Rockies, the Himalayas, Alaska, and Siberia.
Formation:
When a glacier moves down a valley, it erodes the land through plucking and abrasion.
Unlike rivers that wind around spurs, glaciers cut straight through them.
This erosion shears off the ends of the interlocking spurs, forming steep, truncated cliffs..
Conclusion:
Truncated Spurs are important for understanding glacial geomorphology, past glacial activity, and landscape evolution.
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