What is a fold and state its types ?

What is a fold and state its types ? 
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1 Answer

Answer :

Fold: It is defined as undulations or curvatures developed in the rocks of the crust as a result of stresses to which these rocks have been subjected from time to time in the past history of the earth.

Folds generally do not occur singularly but infact they often form a group in which individual members exibit many similarities as well as dissimilarities

i) Anticlinorium: An anticlinorium fold is a large anticline which is further throw into smaller fold

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ii) Synclinorium: Syclinorium is a large syncline further consisting of smaller folds are very large in size 

iii) Domes and Basins: A dome is a special type of anticline in which the beds dip away from the central point in all directions.

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iv) A Basin is a special type of syncline in which the beds dip towards central point from all directions. In outline, domes and basins are generally oval or nearly circular in shape 

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v) Anticlines: Beds are up folded into arch like structure.

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vi) Sydine: Beds are down folded into a trough like structure.

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vii) Overturned folds: Both the limbs of afold may get overturned because of very high compression

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viii) Fan fold: limbs dipping away from each other

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ix) Recumbent Folds: One limb lies vertically above the other.

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x) Isoclina Folds: These folds may be vertical, inclined or horizontal are called as vertical isoclinal fold, Inclined isoclinal fold, recumbent isoclinal fold.

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xi) Open fold and Closed fold: Thickness of bed is same throughout the layer are called as open fold and thickness is more at trough and crest at the limbs is called closed fold.

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