EROSIONAL SURFACES : Discuss the problems of erosional surfaces and explain the different methods to identify them with suitable diagrams.
Why the question was asked-
Conventional
Scope
Very Marks fetching
Approach
Sticking to answering the question,
Problems faced
Comprehension of the topic
Source Book
Physical Geography-K. Siddhartha
Web Source
https://ensembleias.com/programs/qip-geography-optional/
The almost plain topographic surfaces having undulating ground surface and remnant low relief caused by dynamic wheels of denudational processes and cutting across geological formations and structures are generally called erosion or planation surface. These include Peneplain, Pediplains, primarrumpf, Endrumpf, Etchplain Panplains, Gipfelflur, Stockwerk and schietelflur, Strath
Erosion surfaces are important markers for deciphering uplift events. Absolute time scales for events of uplift and erosion can be given by correlation with geology and their morphological data, which is an important tool of the study of geomorphology.
Erosion surfaces form significant elements of landscape of a given region and provide prominent clues for the reconstruction of denudation chronology of that region.
Problems
- Identification
- Difficult
- Modified by tectonic movements and other geomorphic and climatic forces.
- Younger-more uniform, older-dissected
- Morphometric Techniques – altimetric frequency histograms, superimposed profiles etc.
- Dating of Erosion Surfaces
- Time correlation with other such surfaces with known history.
- Geological unconformity – buried under thick sediment cover.
- Interpretation of sequence of sedimentation in adjoining area.
- Drainage patterns – Reconstruction of evolutionary history.
- Radio-Carbon Dating – but can’t be applied for surfaces formed before evolution of organic life or where fossils have been destroyed.
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