In geological terms, what is a monocline?

A monocline is defined as a geological fold characterized by a single steep side, where one end of the rock layers is elevated while the other remains relatively horizontal. This structure typically forms in response to tectonic forces squeezing or lifting the Earth's crust. The steep side of the monocline results from the displacement of rock layers, while the adjacent horizontal sections remain undisturbed, which distinguishes it from more complex folds that have multiple limbs or are symmetrical.

This understanding of monoclines is essential in structural geology, as they can indicate the presence of underlying faults or other geological features. By recognizing monoclines, geologists can infer the historical stress conditions in the area and understand the geological history of the region. The other options describe different geological features or structures that do not accurately represent the definition of a monocline.