Write short notes on the following:a) Criteria for recognition of

Question

Write short notes on the following:

a) Criteria for recognition of folds in field

b) Evolution of Himalaya

15 Apr 2024

Answer :

Word Count : 404

a) Criteria for recognition of folds in the field:

Folds are curved or bent layers of rock that result from tectonic forces. Recognizing folds in the field is crucial for understanding the geological history of an area. Several criteria aid in their identification:

1. Orientation of Layers: Folds cause the originally flat rock layers to bend, resulting in orientations that differ from the surrounding rocks. Observing changes in the orientation of rock layers indicates the presence of folds.

2. Symmetry and Asymmetry: Symmetrical folds have mirror-image halves on either side of the fold axis, while asymmetrical folds have one limb that ______ ______ ______ ______ ________.
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