In the southern part of Bolivia and extreme northern part of Argentina, there is a fold and thrust belt that has developed along the eastern edge of the Andean Orogen. Check out the Chuquisaca and Tarija provinces of Bolivia, or the northern portion of Argentina's Salta province. There you will find a series of N- to NW-trending ridges and valleys, much like the Disturbed Belt in western Montana (which was featured earlier this month on Pathological Geomorphology in the Sun River Canyon area). If you rotated these images a bit to the right, I'll bet I could convince you it's western Virginia or central Pennsylvania. Uniformitarianism, hey?

I know much less about the central Andes than either the Appalachians or the Rockies, but in poking around here you can see these are definitely stratified rock layers which bear folds and in places sport lovely sets of hogbacks. From the facing direction of these hogbacks, you can locally work out the younging direction of the strata and determine whether you're looking at anticlines or synclines. Enjoy the exploration.

¡Vámonos al sur de Bolivia!
http://www.flashearth.com/?lat=-20.484624&lon=-64.111851&z=9&r=0&src=msa

Más "hogbacks," por favor:
http://www.earthscienceworld.org/images/search/results.html?Keyword=Hogbacks