EXOGENIC
PROCESS

Soil
• relatively thin unit of
predominantly fine-grained,
unconsolidated surface
material

Earth debris
• a thicker unit of the same
type of materials, specifies
a given mass of sediment that
contains a wide range of
grain sizes, at least 20% of
which is gravel

Mud
• indicates saturated sediment
composed mainly of clay and
silt, which are the smallest
particles sizes.