A Peneplain is an old eroded Mountain. A example of a Peneplain is Ouachita Mountain range in OK. The are the oldest peneplain mountain range in US.

Peneplain is an eroded mountain.

Monondock

Over million of years the irregular features of earth are eroded and brought down to low plain surface and this low leveled land created is called a peneplain. the uneroded hard rocks over the surface are called monadnocks.

Over million of years the irregular features of earth are eroded and brought down to low plain surface and this low leveled land created is called a peneplain. the uneroded hard rocks over the surface are called monadnocks.