What kinds of rocks usually form folded mountains?

Folded mountains typically form from sedimentary rocks, which are often subjected to intense tectonic forces that cause them to buckle and fold. These rocks accumulate in layers over time, and when tectonic plates collide, the pressure can lead to complex folding patterns. Common examples of sedimentary rocks involved in this process include limestone, sandstone, and shale. Additionally, metamorphic rocks can also be present in folded mountain ranges, resulting from the transformation of sedimentary rocks under heat and pressure.