A syncline is comprised of downward folding layers of rock.
Syncline is a type of fold that is created when the crust bends and curves downward. It is a fold that is convex up and has its oldest beds at its core.
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syncline
syncline
Sycline
A syncline is a fold in the crust that bends downward into a valley.
Syncline.
...known as syncline
That type of fault is known as Synclinal fault.
Syncline
An upward (U-shaped) fold is called a syncline. a downward (n-shaped) fold is called an anticline. The way I always remember it is that a SYNCline SINKs in the middle.
The opposite action is "unfold" or straighten.The opposite of a fold (upward) could be a crease (downward) but they can also mean the same thing in many uses.