Catenas are found to be a great location for the study of soil science, given that the catena concept focuses on past history of the land surface, on hydrology, erosion, sediment transport, and pedogenic processes.
12.
This occurred at deeper levels, at the intersection with the groundwater table ( forming " groundwater silcrete " ), or close to the surface, within the soil profile ( forming " pedogenic silcrete " ).
13.
Wilkinson and Humphreys offer evidence that bioturbation appears to be the most active pedogenic process operating in many soils . While probably close to the mark, research over multiple decades strongly indicates that bioturbation is the dominant process in the upper part of most soils, notable exceptions possibly being vertisols and cryosols, where shrink-swell and freeze-thaw processes, respectively, appear dominant.
