Rocks are subjected to intense pressures and temperatures during metamorphism. This makes them quite ductile and allows them to fold into weird and wonderful shapes.  Sometimes they are folded mutiple times such that early-formed folds will be re-folded.  The metamorphic rocks in Colorado endured three, and perhaps four, periods of ductile deformation. Below are some examples of folding in metamorphic rocks in Colorado. To learn about refolded folds, Click here.