Lithology of rock
The lithology of arock unit is a description of its
physical characteristics visible at outcrop, in hand or core
samples or with low magnification microscopy, such as
colour, texture, grain size, or composition.
It may be either a detailed description of these
characteristics or be a summary of the gross physical
character of a rock. It is the basis of subdividing rock
sequences into individual lithostratigraphic units for the
purposes of mapping and correlation between areas.