Formation is the fundamental sedimentary rock unit can be normally traced for long distances .
Step-by-step explanation:
When the energy of the transformation is not enough it is settled and deposites in the particular area for the long time. It can be formed at the earth surface by the accumulation of sediments.
The sedimentary rocks are separated by the break called bedding planes. For the formation of the sedimentary rock the sedimentary bed is the basic unit of the formation.
The sedimentation of rock can be classified as weathering erosion, transportation, deposition, lithification of the sedimentary rock unit.