What are regs and gibber plains in desert landscapes?

Regs and gibber plains are types of stony desert landscapes characterized by a surface layer of coarse gravel and stones, often referred to as desert pavement. These surfaces are frequently coated with a dark, glossy patina known as desert varnish, which consists of iron and manganese oxides.

• Regs: These are stony plains found in desert regions where wind and water action have removed fine sediments, leaving behind a concentrated layer of gravel and pebbles.12
• Gibber plains: Primarily associated with arid or semi-arid regions in Australia, these areas are littered with angular rock fragments. These fragments are typically derived from silcrete, a hardened soil crust cemented by silica. The gravel cover may consist of a single layer of stones or multiple layers embedded in fine-grained material.32

Both landforms are products of mechanical weathering and the erosive forces of wind and water, which leave behind a stable, rocky surface that prevents further deflation.132