In structural geology, an anticline is a fold that's convex up and has its oldest beds at its core. The term isn't to be confused with antiform, which is a purely descriptive term for any fold that's convex up. Therefore if age relationships (for example younging direction) between various strata are unknown, the term antiform must be used. On a geologic map, anticlines are usually recognized by a sequence of rock layers that are progressively older toward the center of the fold because the up… (More on Anticline)