How did folding and faulting build the Apennine Range?

The Apennine Range was primarily constructed through the folding and faulting of sedimentary rocks that had been deposited on the Italian peninsula. This mountain-building process, known as the Apennine orogeny, occurred largely during the Cenozoic Era, reaching its peak in the Miocene and Pliocene epochs.12

The range is characterized as a thrust-belt structure, with deformation occurring in a northeast–southwest direction. This tectonic evolution was driven by several complex factors, including:21

• Tectonic Movement: The northeastward movement of Italy toward the Adriatic coast and the rotation of Corsica and Sardinia away from southern France contributed significantly to the crustal shortening that folded the sedimentary layers.1
• Faulting and Crustal Thinning: In the last million years, large faults have developed along the western side of the Apennines. These are associated with crustal thinning that began approximately 10 million years ago, which also facilitated the formation of the Tyrrhenian Sea and widespread volcanic activity.21

Today, the range's rugged appearance is a direct result of this geologic youth and the diverse types of sedimentary rock involved in these tectonic processes.2