What geological movement can lead to the formation of an angular unconformity?

The formation of an angular unconformity is primarily associated with mountain uplift and tilting. Angular unconformities occur when sedimentary rock layers are deposited horizontally but are later subjected to tectonic forces that cause them to tilt or fold. After this tilting, the uplifting process can expose these rocks to erosion and weathering. New sediment layers can then be deposited on top of the eroded surface at a different angle, resulting in an unconformity where the older layers and the newer layers do not align parallel to each other.

This geological movement illustrates the dynamic nature of the Earth's crust, where tectonic forces play a significant role in reshaping landscapes over geological time. Understanding angular unconformities is crucial for interpreting the geological history of an area, as they indicate periods of intense geological activity followed by erosion before sedimentation resumes.