The period may be subdivided into Early, Middle and Late Epipalaeolithic: The Early Epipalaeolithic corresponds to the Kebaran culture, c. 20,000 to 14,500 years ago, the Middle Epipalaeolithic is the Geometric Kebaran or late phase of the Kebaran, and the Late Epipalaeolithic to the Natufian, 14,500–11,500 BP.[7] The Natufian overlaps with the incipient Neolithic Revolution, the Pre-Pottery Neolithic A.