Although there are more than just two kinds of folds we will only mention these two: Syncline and Anticline
These folds are caused by horizontal compression, forcing the rock layers to bend and twist.
Syncline: is a fold in a rock where the axis dips.
Anticline: is a fold in a rock where the axis is pushed up.
The Devil's Punchbowl is a large sandstone syncline, where the edges of the formation have been folded upward, and the center has dipped. The entire formation is not only a syncline, but a plunging syncline. This is illustrated in the graphic below.