from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A thin hard layer found near the surface in soil.
The plan is to attempt to drive the rover forward, which is actually backward, since the rover was driving in reverse when it entered this area where it broke through a "duricrust" and fell through to the talcum powder-like soil.
Above the granite bedrock is a characteristic soil structure, consisting of seasonally well-aerated and well-watered sandy soils of 0.6 m to 3 m in depth that desiccate and harden during the dry season, with an impermeable "duricrust" of cement-like consistency beneath.
In southeast Queensland there are also localized remnant Tertiary surfaces with duricrust and laterite.
Gently undulating plains on Cretaceous sediments surround the floodplains, often with a duricrust forming a dense gravel or rock (gibber) surface pavement.
Caliche is also known as hardpan, calcrete, kankar (in India), or duricrust.