ABSTBACT: Explanation« on the genesis of magmatîc layering is based on on© of the two fondamental processes : Crystal settling and importance, to which differential settling" of phases that eryptklOe together m the main cause of nıagınattc layering. With the development of new studies, the second tflheaOe becomes stronger, In this case, layering Is caused by the oscillatory changes In the mineral type and relative percentage of crystallizing- phases during Eradication. Hence, the solution of the problem to sought in the shading light on soliclfficaüon thermodynamics that cause oscillatory crystallization, İn the paper, atteanps to explain either process is critically reviewed with examples.