Which types of rock make up most of the Apennine Range?

The majority of the Apennine Range is composed of marine sedimentary rocks, which were deposited during the Mesozoic Era along the southern margin of the Tethys Sea.1

These geologic units consist primarily of:
* Shales1
* Sandstones1
* Limestones1

While these sedimentary types dominate the range, the composition varies by region. In the north, sandstones, marls, and greenstones are common, while the central and southern portions feature extensive calcareous rock outcrops and argillaceous (clayey) deposits. Igneous rocks are generally scarce, though some metamorphic units and granitic intrusions exist in specific areas like Calabria and Sicily, often associated with complex tectonic history.1