The granitic core of the anticlinal mountains often has been upfaulted, and many ranges are flanked by Paleozoic sedimentary rocks (e.g., shales, siltstones, and sandstones) that have been eroded into hogback ridges. This same mountain-building process is occurring today in the Andes Mountains of South America.

Where are anticlines and synclines found?

Anticlines and synclines form in sections of the crust that are undergoing compression, places where the crust is being pushed together.

Where are anticlines located?

A typical anticline is convex up in which the hinge or crest is the location where the curvature is greatest, and the limbs are the sides of the fold that dip away from the hinge.