Instructural geology, asyncline is afold with younger layers closer to the center of the structure, whereas ananticline is the inverse of a syncline. Asynclinorium (pluralsynclinoriums orsynclinoria) is a large syncline with superimposed smaller folds.[1] Synclines are typically a downward fold (synform), termed a synformal syncline (i.e. a trough), but synclines that point upwards can be found when strata have been overturned and folded (an antiformal syncline).
On a geologic map, synclines are recognized as a sequence ofrocklayers, with the youngest at the fold's center orhinge and with a reverse sequence of the same rock layers on the opposite side of the hinge. If the fold pattern is circular or elongate, the structure is abasin. Folds typically form duringcrustal deformation as the result of compression that accompaniesorogenic mountain building.
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