Basin 5. Figure 8.17 | The three main fold types, from left to right, are monocline, anticline, and syncline (the anticline and syncline are both displayed in the right block in the figure). block diagram of a monocline The Grandview-Phantom Monocline in the Grand Canyon , Arizona An anticline is a fold that is convex: it curves like a rainbow. “A” is for “anticline,” and the capital letter “A” represents the shape of the fold. 28.2. (f) A basin has the (e) A dome has the shape of an overturned bowl. PLUNGING FOLD : A fold whose axis is inclined at an angle (0