Draw the rock layers on the left set of blocks below, being careful to accurately display the rock thickness on the side and top views. Next, tilt your rock layers to a dip of about 20 o East, then erode the top edges with dental floss to make a horizontal surface. Now draw the rock layers on the right set of blocks below, being careful to accurately display the rock thickness. Compare the map views of both cases. Part B. Folds.
Folds are a type of plastic deformation that occurs in rocks.
Folds develop in rocks that are naturally weak or in rocks that are deeply buried and thereby subjected to considerable heat and pressure. Compression is the most common type of stress associated with folds. There are 2 general forms of folds. Seldom are complete folds found in outcrops. Usually they are extensively eroded.