A more or less level land surface produced by erosion over a long period, undisturbed by crustal movement.
- Here the sequence of processes and landforms which exists between the tectonic uplift of an area and its reduction to a peneplain or erosion surface close to base level is believed to have occurred many times in certain regions.
- the Palaeozoic Urals were eroded down to a peneplain by the end of Jurassic time, with platform sediments covering most of the orogen.
- The south slope is generally planar except where incised by glacial or fluvial valleys and is a remnant peneplain of late Cretaceous-early Tertiary age, which is well developed in western Mongolia and adjacent regions of China.
Late 19th century: from Latin paene 'almost' + plain1.
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